<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-246X</journal-id>
<journal-title><![CDATA[Revista Facultad de Odontología Universidad de Antioquia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Fac Odontol Univ Antioq]]></abbrev-journal-title>
<issn>0121-246X</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia ]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-246X2013000200011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[EL HIDRÓXIDO DE CALCIO, COMO PARADIGMA CLÍNICO, ES SUPERADO POR EL AGREGADO DE TRIÓXIDO MINERAL (MTA)]]></article-title>
<article-title xml:lang="en"><![CDATA[CALCIUM HYDROXIDE AS A CLINICAL PARADIGM IS SURPASSED BY MINERAL TRIOXIDE AGGREGATE (MTA)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yepes Delgado]]></surname>
<given-names><![CDATA[Fanny Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castrillón Yepes]]></surname>
<given-names><![CDATA[César Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Odontología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Facultad de Odontología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>25</volume>
<numero>1</numero>
<fpage>176</fpage>
<lpage>207</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-246X2013000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-246X2013000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-246X2013000200011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[INTRODUCCIÓN: desde la investigación científica, el hidróxido de calcio (HC) se posicionó por varias décadas, como una elección con alta posibilidad predictiva en la terapia pulpar. Hoy en día, estamos frente a la ruptura de este paradigma, debido a que ha surgido el mineral trióxido agregado (MTA), con sus características de biocompatibilidad, habilidad para estimular la mineralización, poder antimicrobiano y otras que lo hacen más exitoso en la terapia endodóncica. El objetivo de esta revisión fue identificar los usos del HC y del MTA, desde 1995 hasta el presente, en diferentes condiciones clínicas odontológicas. MÉTODOS: se hizo una búsqueda detallada de la literatura en las bases de datos Medline, PubMed y SciELO, desde 1995 hasta el presente. Se revisaron los títulos, resúmenes, artículos completos, revisiones sistemáticas, y meta análisis, relacionadas con el HC y el MTA. RESULTADOS: basados en investigaciones científicas, muchos son los estudios que destacan las propiedades del HC en la terapia pulpar; sin embargo, se ha venido utilizando y estudiando el MTA, como material de reemplazo. CONCLUSIONES: con el MTA, estamos frente a un material, que según los resultados de las investigaciones, puede emplearse en las mismas situaciones indicadas para el uso del HC, con una mejor predecibilidad de éxito.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[INTRODUCTION: as a result of scientific research, calcium hydroxide (CH) enjoyed a privileged position for several decades as a choice with high predictive abilities for pulp therapy. We are now witnessing the collapse of this paradigm due to the emergence of mineral trioxide aggregate (MTA) with its biocompatibility&mdash;an ability to stimulate mineralization&mdash;, antimicrobial properties, and other advantages that make it more successful in endodontic therapy. The objective of this topic review was to identify the uses of CH and MTA from 1995 to the present, in different clinical conditions. METHODS: this review consisted of a comprehensive literature search in Medline, PubMed, and SciELO from 1995 to the present. It included titles, abstracts, full articles, systematic reviews, and meta-analysis related to CH and MTA. RESULTS: a number of scientific studies highlight the properties of CH in pulp therapy; however, MTA has also been used and studied as a replacement material. CONCLUSIONS: according to research on this field, MTA can be used in the same situations for which CH is recommended, with better probabilities of success.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[terapia pulpar]]></kwd>
<kwd lng="es"><![CDATA[recubrimiento pulpar]]></kwd>
<kwd lng="es"><![CDATA[hidróxido de calcio]]></kwd>
<kwd lng="es"><![CDATA[apexificación]]></kwd>
<kwd lng="es"><![CDATA[pulpotomía]]></kwd>
<kwd lng="es"><![CDATA[mineral trióxido agregado]]></kwd>
<kwd lng="en"><![CDATA[pulp therapy]]></kwd>
<kwd lng="en"><![CDATA[pulp capping]]></kwd>
<kwd lng="en"><![CDATA[calcium hydroxide]]></kwd>
<kwd lng="en"><![CDATA[apexification]]></kwd>
<kwd lng="en"><![CDATA[pulpotomy]]></kwd>
<kwd lng="en"><![CDATA[mineral trioxide aggregate]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">      <p align="right"><b>REVISI&Oacute;N DE TEMA</b></p>          <p>&nbsp;</p>       <p align="center"><font size="4" face="Verdana"><b>EL HIDR&Oacute;XIDO DE CALCIO, COMO PARADIGMA CL&Iacute;NICO, ES SUPERADO POR EL AGREGADO DE TRI&Oacute;XIDO MINERAL (MTA)</b></font></p>           <p>&nbsp;</p>           <p>&nbsp;</p>     <b>Fanny Luc&iacute;a Yepes Delgado<SUP>1</SUP>; C&eacute;sar Augusto Castrill&oacute;n Yepes<sup>2</sup></b></p>         <p>&nbsp;</p>         <p><sup>1 </sup>Odont&oacute;loga, especialista en Odontolog&iacute;a Integral del Adulto, mag&iacute;ster en Educaci&oacute;n: Sociolog&iacute;a de la Educaci&oacute;n. Profesora titular e investigadora, Facultad de Odontolog&iacute;a Universidad de Antioquia. Correo electr&oacute;nico: <a href="mailto:faluyede@gmail.com">faluyede@gmail.com</a>     <p>    <sup>2</sup> Odont&oacute;logo, especialista cl&iacute;nico en Odontolog&iacute;a Integral del Adulto con &eacute;nfasis en Periodoncia. Investigador, Facultad de Odontolog&iacute;a Universidad de Antioquia. Correo electr&oacute;nico: <a href="mailto:cesarmadrid11@hotmail. com">cesarmadrid11@hotmail.com</a>            <p>&nbsp;</p>      ]]></body>
<body><![CDATA[<p><b>RECIBIDO: FEBRERO 14/2012-ACEPTADO: ENERO 22/2013</b></p>      <p>&nbsp;</p>       <p>Yepes FL y Castrill&oacute;n CA. El hidr&oacute;xido de calcio, como paradigma cl&iacute;nico, es superado por el agregado de tri&oacute;xido mineral (MTA). Rev Fac Odontol Univ Antioq 2013; 25(1): 176-207.</p>      <p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade>      <p><b>RESUMEN</b></p>           <p><b>INTRODUCCI&Oacute;N:</b> desde la investigaci&oacute;n cient&iacute;fica, el hidr&oacute;xido de calcio (HC) se posicion&oacute; por varias d&eacute;cadas, como una elecci&oacute;n con alta posibilidad predictiva en la terapia pulpar. Hoy en d&iacute;a, estamos frente a la ruptura de este paradigma, debido a que ha surgido el mineral tri&oacute;xido agregado (MTA), con sus caracter&iacute;sticas de biocompatibilidad, habilidad para estimular la mineralizaci&oacute;n, poder antimicrobiano y otras que lo hacen m&aacute;s exitoso en la terapia endod&oacute;ncica. El objetivo de esta revisi&oacute;n fue identificar los usos del HC y del MTA, desde 1995 hasta el presente, en diferentes condiciones cl&iacute;nicas odontol&oacute;gicas.  <b>M&Eacute;TODOS:</b> se hizo una b&uacute;squeda detallada de la literatura en las bases de datos Medline, PubMed y SciELO, desde 1995 hasta el presente. Se revisaron los t&iacute;tulos, res&uacute;menes, art&iacute;culos completos, revisiones sistem&aacute;ticas, y meta an&aacute;lisis, relacionadas con el HC y el MTA.  <b>RESULTADOS: </b>basados en investigaciones cient&iacute;ficas, muchos son los estudios que destacan las propiedades del HC en la terapia pulpar; sin embargo, se ha venido utilizando y estudiando el MTA, como material de reemplazo.  <b>CONCLUSIONES: </b>con el MTA, estamos frente a un material, que seg&uacute;n los resultados de las investigaciones, puede emplearse en las mismas situaciones indicadas para el uso del HC, con una mejor predecibilidad de &eacute;xito.</p>        <p><b>Palabras clave:</b> terapia pulpar, recubrimiento pulpar, hidr&oacute;xido de calcio, apexificaci&oacute;n, pulpotom&iacute;a, mineral tri&oacute;xido agregado.</p>  <hr noshade>             <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="3" face="Verdana"><b>INTRODUCCI&Oacute;N </b></font></p>      <p>La investigaci&oacute;n cient&iacute;fica situ&oacute; al hidr&oacute;xido de calcio (HC), desde hace varias d&eacute;cadas, como elecci&oacute;n de uso con alta posibilidad predictiva en la terapia pulpar para preservar su vitalidad y lograr la acci&oacute;n de est&iacute;mulo en la remineralizaci&oacute;n de los tejidos dentales, en condiciones cl&iacute;nicas tales como: recubrimientos pulpares, apexificaci&oacute;n, reabsorciones internas, entre otros. Sin embargo, en los &uacute;ltimos a&ntilde;os se ha investigado el mineral tri&oacute;xido agregado (MTA), en terapia pulpar, el cual, seg&uacute;n la investigaci&oacute;n cient&iacute;fica, est&aacute; rompiendo el paradigma cl&iacute;nico del HC, para imponerse, dados los resultados obtenidos con su utilizaci&oacute;n.</p>      <p>El HC es un material que se obtiene por calcinaci&oacute;n del carbonato c&aacute;lcico: Ca(OH)<sub>2</sub> + CO<sub>2</sub> __ CaCO<sub>3</sub> + H<sub>2</sub>O. Adem&aacute;s, este polvo granular, amorfo y fino posee marcadas propiedades b&aacute;sicas, como un pH alcalino aproximadamente de 12,4, lo cual le confiere un gran poder bactericida.<sup>1, 2</sup> Al ser aplicado sobre una pulpa vital, su acci&oacute;n c&aacute;ustica provoca una zona de necrosis est&eacute;ril y superficial, con hem&oacute;lisis y coagulaci&oacute;n de las alb&uacute;minas, quedando atenuada por la formaci&oacute;n de una capa subyacente compacta, compuesta de carbonato de calcio debida al CO<sup>2</sup> de los tejidos y de prote&iacute;nas, producto de la estimulaci&oacute;n dentinaria.<sup>1, 2</sup> Su densidad es de 2,1; puede disolverse ligeramente en agua y es insoluble en alcohol, con la particularidad de que al aumentar la temperatura disminuye su solubilidad.<SUP>1, 3</SUP></p>      <p>El primer medicamento a base de HC fue introducido en odontolog&iacute;a por B. W. Hermann, en los a&ntilde;os 1920 y fue denominado Calxyl.<sup>4</sup> Desde entonces, el HC ha sido usado ampliamente en el tratamiento de las lesiones endod&oacute;nticas.</p>      <p>En esta revisi&oacute;n se encontraron investigaciones que analizan un material con las funciones del HC, como es el MTA, convirti&eacute;ndose en el material de elecci&oacute;n por haberse encontrado diferencias estad&iacute;sticamente significativas respecto al HC.</p>       <p>El MTA fue desarrollado y reportado por primera vez en 1993 por Lee, Torabinejad y colaboradores;<sup>5</sup> se aprob&oacute; su uso en odontolog&iacute;a en 1998 por la FDA (<i>Food and Drugs Administration</i>) y fue lanzado comercialmente en 1999, con el nombre de ProRoot MTA (Dentsply), de color gris, hasta que en 2002 sali&oacute; al mercado el MTA blanco, de igual composici&oacute;n.<sup>6</sup></p>      <p>Este material se presenta como un polvo hidrof&iacute;lico que fragua en presencia de agua.<sup>7</sup> El MTA est&aacute; compuesto de silicato tric&aacute;lcico, &oacute;xido tric&aacute;lcico, &oacute;xido de silicio y otros &oacute;xidos minerales responsables de sus propiedades, como el &oacute;xido de bismuto, responsable de su radiopacidad.<sup>8, 9</sup> Posee elevada capacidad antimicrobiana, pues, el &oacute;xido de calcio, al mezclar el polvo de MTA con agua, reacciona con esta &uacute;ltima, formando HC, que provoca aumento del pH por disociaci&oacute;n de iones calcio e hidroxilo, creando un ambiente inadecuado para el desarrollo bacteriano y f&uacute;ngico.<sup>10</sup></p>      <p>El MTA es un material que ha sido usado internacionalmente, con aplicaciones cl&iacute;nicas tales como: apexificaciones, reparaci&oacute;n de perforaciones radiculares, en obturaciones retr&oacute;gradas y en recubrimiento pulpar directo e indirecto. Adem&aacute;s, puede ser el &uacute;nico que consistentemente permite regeneraci&oacute;n del ligamento periodontal, aposici&oacute;n de tejido parecido al cemento y formaci&oacute;n &oacute;sea.<sup>11</sup></p>      <p>El prop&oacute;sito de este trabajo fue actualizar la revisi&oacute;n tem&aacute;tica que sobre el HC se hab&iacute;a hecho por Yepes.<sup>12</sup> debido a que a&uacute;n se mantiene el inter&eacute;s por la investigaci&oacute;n del HC, como material tradicionalmente utilizado en la terapia pulpar. Asimismo, se hace revisi&oacute;n del MTA, por ser el material que lo est&aacute; sustituyendo, dadas las cualidades que lo hacen preferible al HC, con lo cual se evidencia que est&aacute; ocurriendo seg&uacute;n la investigaci&oacute;n cient&iacute;fica, la ruptura de un paradigma cl&iacute;nico, con el uso del MTA, remplazando al HC.</p>       <p>&nbsp;</p>      ]]></body>
<body><![CDATA[<p><font size="3" face="Verdana"><b>USOS CL&Iacute;NICOS DEL HIDR&Oacute;XIDO DE CALCIO</b></font></p>      <p><b>Recubrimiento pulpar directo y pulpotom&iacute;a</b></p>      <p>El recubrimiento pulpar es un procedimiento que intenta preservar las funciones vitales de la pulpa, cuando no ha existido una historia de dolor persistente a los est&iacute;mulos externos y cuando la pulpa ha sido expuesta al ambiente oral de manera accidental.<sup>13, 14</sup> El recubrimiento y el sellado marginal que se obtiene al aplicar sobre el tejido pulpar un material, puede ser el factor clave que determine el resultado final de dicho procedimiento.<sup>15</sup> Cox y colaboradores,<sup>16</sup> ratificaron que la pulpa podr&iacute;a formar una barrera de tejido duro si fuera proporcionado un selle biol&oacute;gico adecuado, de manera que los microorganismos no tengan acceso al tejido pulpar. El material ideal para el recubrimiento pulpar directo debe controlar la infecci&oacute;n, adherirse a la dentina para evitar la microfiltraci&oacute;n, ser de manejo cl&iacute;nico simple y promover la formaci&oacute;n de un puente dentinario.<sup>17</sup> El material usado tradicionalmente en odontolog&iacute;a, que cumple en parte con estas cualidades, es el HC.<sup>18</sup> Sin embargo, los productos de autograbado han mostrado un buen desempe&ntilde;o en la prevenci&oacute;n de la microfiltraci&oacute;n<sup>19</sup> que, junto con su considerable efecto antibacteriano<sup>20</sup> (los productos que contengan glutaraldeh&iacute;do o que tienen una propiedad &aacute;cida presentan algunos efectos antibacterianos), los hace agentes prometedores de recubrimiento pulpar directo. Estudios en animales han demostrado que estos materiales de restauraci&oacute;n no causan inflamaci&oacute;n pulpar o necrosis cuando se colocan directamente sobre la pulpa expuesta, si las bacterias han sido eliminadas de los m&aacute;rgenes.<sup>21</sup> Algunas investigaciones reportan que el &eacute;xito cl&iacute;nico del HC, va del 31 al 100%, en una pulpotom&iacute;a.<sup>22, 23</sup> Otros investigadores no hablan de porcentajes, pero lo consideran muy exitoso para pulpotom&iacute;a.<sup>24-30</sup> El pH alcalino inducido por el HC, no solo neutraliza el &aacute;cido l&aacute;ctico de los osteoclastos, evitando as&iacute; la disoluci&oacute;n de los componentes minerales de la dentina, sino que tambi&eacute;n puede activar las fosfatasas alcalinas, que desempe&ntilde;an un papel importante en la formaci&oacute;n de tejido duro.<sup>31</sup></p>      <p>Aunque la toxicidad sist&eacute;mica y local est&aacute; ausente, se requiere el control de la hemorragia con el fin de permitir buen contacto entre el medicamento y el tejido pulpar.<sup>32, 23</sup> Cuando no se controla la hemorragia, no est&aacute; indicado el uso del HC.</p>      <p>Los principios de la odontolog&iacute;a basada en la evidencia, se utilizaron para comparar el MTA, con el formocresol (FC), sulfato f&eacute;rrico (FS) y el HC como principales medicamentos en pulpotom&iacute;a de molares. La evidencia disponible actualmente sugiere que el MTA en comparaci&oacute;n con ellos, dio lugar a &eacute;xitos cl&iacute;nicos y radiogr&aacute;ficos significativamente mayores en todos los periodos de tiempo comparados hasta la exfoliaci&oacute;n.<sup>33</sup></p>      <p><b>Formaci&oacute;n del puente dentinario</b></p>      <p>El procedimiento de recubrimiento pulpar se basa principalmente en la capacidad del tejido pulpar para repararse. Varios factores afectan este proceso, incluyendo la edad, la condici&oacute;n periodontal y el estadio de formaci&oacute;n radicular y durante el procedimiento influye el tama&ntilde;o de la exposici&oacute;n, su naturaleza (traum&aacute;tica, mec&aacute;nica o bacteriana) y la contaminaci&oacute;n microbiana del sitio, los cuales se han considerado determinantes en el &eacute;xito del recubrimiento pulpar.<sup>34</sup> El HC, con su pH b&aacute;sico (pH 12) lo convierte en un agente bactericida, pero adem&aacute;s, permite la formaci&oacute;n de un puente dentinario cuando es colocado directamente sobre la pulpa.<sup>25</sup></p>      <p>Estudios como el de Lu y colaboradores,<sup>35</sup> los cuales comparan los efectos de dos materiales colocados en forma directa sobre la pulpa, demuestran que el HC al inicio de la terapia produce inflamaci&oacute;n leve, la cual se convierte en necrosis superficial, permitiendo la formaci&oacute;n de un puente dentinario, mientras que con un agente adhesivo (Clearfill SE BOND), la formaci&oacute;n de esta barrera fue significativamente menor.</p>     <p>El control de la hemorragia es un procedimiento que determina el &eacute;xito del recubrimiento pulpar directo. Seg&uacute;n Schroder,<sup>36</sup> la falta de una hemostasia antes de la colocaci&oacute;n del HC afecta el tratamiento, porque un co&aacute;gulo puede formar una barrera que impida el contacto entre el material y la pulpa expuesta; adem&aacute;s estos co&aacute;gulos pueden actuar como un sustrato para los microorganismos, lo que conduce a la infecci&oacute;n pulpar.<sup>37</sup></p>      <p>El hecho de que el MTA se endurezca en presencia de humedad, puede permitir mejor sellado de la c&aacute;mara, y los resultados, en consecuencia, son mejores en comparaci&oacute;n con el HC, el MTA se puede utilizar en &aacute;reas en las que es pr&aacute;cticamente imposible lograr un ambiente totalmente seco.<sup>38</sup></p>      ]]></body>
<body><![CDATA[<p>El recubrimiento pulpar con MTA produce cambios citol&oacute;gicos y funcionales de las c&eacute;lulas pulpares, resultando en la producci&oacute;n de dentina reparativa sobre la superficie de una pulpa expuesta mec&aacute;nicamente. El MTA ofrece un sustrato biol&oacute;gicamente activo para las c&eacute;lulas pulpares, necesario para regular los eventos dentinog&eacute;nicos. El efecto inicial del MTA sobre la superficie de la pulpa expuesta mec&aacute;nicamente es la formaci&oacute;n de una capa de estructuras cristalinas. Esta reacci&oacute;n inmediata indica la estimulaci&oacute;n de la actividad biosint&eacute;tica de las c&eacute;lulas pulpares por el recubrimiento, pero no puede ser caracterizada como una inducci&oacute;n directa de la formaci&oacute;n de dentina reparativa. Una nueva matriz de formas atubulares con inclusiones celulares se observan debajo del material a las dos semanas. Al evaluarlo bajo microscopio electr&oacute;nico de barrido se encontraron fibras col&aacute;genas, contacto directo con la capa cristalina superficial. La dentinog&eacute;nesis reparativa se obtiene claramente a las tres semanas del recubrimiento, asociada con una matriz fibrodentinal. Por lo tanto el MTA es un material efectivo para el recubrimiento pulpar directo, al favorecer la formaci&oacute;n de un puente de tejido duro durante el proceso de reparaci&oacute;n, si el procedimiento es hecho bajo asepsia.<sup>39</sup></p>      <p><b>Efectos del recubrimiento pulpar directo (RPD)</b></p>      <p>La terapia pulpar vital ha sido conocida como una de las opciones de tratamiento para conservar la pulpa despu&eacute;s de ser expuesta por trauma o caries.</p>      <p>El tejido pulpar en contacto inmediato con el HC es completamente desorganizado y destruido por el efecto c&aacute;ustico (una cauterizaci&oacute;n qu&iacute;mica), esta zona es llamada zona de obliteraci&oacute;n, la cual consiste en escombros, fragmentos de dentina, hemorragia, co&aacute;gulo de sangre, pigmentos de sangre y part&iacute;culas de HC, form&aacute;ndose la zona momificada que es de necrosis por coagulaci&oacute;n y trombosis capilar. Esta zona tiene un espesor entre 0,2 y 0,5 mm representado por un tejido desvitalizado sin p&eacute;rdida completa de su arquitectura estructural y poco infiltrado inflamatorio. La zona momificada estimula el tejido pulpar subyacente para responder con todo su potencial de cicatrizaci&oacute;n y producir un puente dentinario.<sup>40</sup> La secuencia en la cicatrizaci&oacute;n del tejido es b&aacute;sicamente la normal de una herida del tejido conjuntivo. El proceso de reparaci&oacute;n ocurre con la migraci&oacute;n y la proliferaci&oacute;n de c&eacute;lulas pulpares mesenquimatosas, endoteliales y formaci&oacute;n de col&aacute;geno.<sup>41</sup> Cuando la pulpa est&aacute; protegida de irritaci&oacute;n se produce la diferenciaci&oacute;n de odontoblastos y la formaci&oacute;n de tejido dentinario, por lo que la funci&oacute;n de la pulpa es normalizada.<sup>42</sup></p>      <p>Se han empleado muchos materiales para el recubrimiento pulpar directo y tradicionalmente se acept&oacute; el HC como el material de elecci&oacute;n, debido a su capacidad comprobada para obtener altos porcentajes de &eacute;xito. Actualmente se est&aacute; evaluando la posibilidad de la utilizaci&oacute;n de los adhesivos dentinarios como recubridores pulpares. Pero existen controversias por resultados poco favorables;43 otro material utilizado para el recubrimiento pulpar directo es el MTA, el cual ha demostrado que estimula la formaci&oacute;n de puentes de dentina adyacentes a la pulpa dental. Esta formaci&oacute;n de dentina puede ser debida a la capacidad de sellado, alcalinidad, biocompatibilidad y a otras propiedades remineralizantes del MTA.<sup>44</sup></p>      <p>Eskandarizadeh y colaboradores45 hicieron un estudio comparativo sobre la respuesta de la pulpa dental con HC y MTA como agentes de recubrimiento pulpar. Con base en el resultado de este estudio, se puede sugerir al MTA como material de elecci&oacute;n para el recubrimiento pulpar directo.</p>      <p>Leye Benoist y colaboradores,<sup>46</sup> en un estudio controlado aleatorio en dientes humanos, compararon el HC con MTA: el espesor de la dentina reci&eacute;n formada se midi&oacute; a intervalos de 3 y 6 meses; la formaci&oacute;n de la dentina se control&oacute; con mediciones radiol&oacute;gicas en im&aacute;genes digitalizadas, utilizando Mesurim Pro<sup>&reg;</sup> de <i>software</i>.</p>      <p>Se observaron mejores resultados (estad&iacute;sticamente significativos) en el grupo del MTA despu&eacute;s de 3 meses; pero luego de 6 meses no hubo diferencia en el espesor de la dentina, entre los dos grupos.</p>      <p><b>Controversias</b></p>      <p>Hay autores que dicen que el HC puede degradarse durante el proceso de grabado &aacute;cido que se hace antes de una restauraci&oacute;n y piensan que otros materiales como el MTA, podr&iacute;an remplazarlo;<sup>47, 48</sup> durante las &uacute;ltimas tres d&eacute;cadas, aparecieron varias publicaciones en relaci&oacute;n con el recubrimiento pulpar en seres humanos, utilizando HC, agentes de uni&oacute;n y otros materiales, incluyendo MTA. Este se ha evaluado en varias investigaciones, demostr&aacute;ndose su biocompatibilidad y buena capacidad de sellado.<sup>49</sup></p>      ]]></body>
<body><![CDATA[<p>El tejido conocido como puente de dentina fue observado cuando el MTA fue investigado preliminarmente en modelos animales, antes de su aplicaci&oacute;n cl&iacute;nica en seres humanos;<sup>50</sup> los resultados indican que los compromisos pulpares por causas iatrog&eacute;nicas, tratados con MTA, se presentan libres de inflamaci&oacute;n despu&eacute;s de 1 semana y se forma de manera compacta el puente de dentina, con una longitud y un espesor considerable en menos de 3 meses. <sup>51</sup> Con el HC se impide la contaminaci&oacute;n y se han observado pocos defectos visibles, lo cual indica la compactaci&oacute;n de la barrera de tejido duro formado para lograrse buena calidad del puente formado.<sup>16</sup></p>      <p>La formaci&oacute;n del tejido duro subyacente a la barrera de MTA, es probablemente multifactorial, ya que implica factores determinantes como su capacidad de sellado;<sup>5, 52, 53</sup> su biocompatibilidad,<sup>54, 55</sup> y la producci&oacute;n de un medio ambiente alcalino sobre la pulpa.<sup>56-58</sup> Los resultados del estudio hecho por Olsson y colaboradores<sup>51</sup> permiten concluir que el MTA es cl&iacute;nicamente f&aacute;cil de usar, adem&aacute;s los resultados en la pulpa son de menos inflamaci&oacute;n y la formaci&oacute;n de una barrera de tejido duro es m&aacute;s previsible que con el HC. Por lo tanto, el MTA, deber&iacute;a ser el material de elecci&oacute;n para el recubrimiento pulpar directo.<sup>51</sup></p>      <p>Un estudio hecho por Moretti y colaboradores<sup>59</sup> que interviene en la controversia, evalu&oacute; y compar&oacute; cl&iacute;nica y radiogr&aacute;ficamente los efectos del MTA, el HC y el formocresol (FC), como ap&oacute;sitos despu&eacute;s de la amputaci&oacute;n de la pulpa coronal en molares deciduos cariados. En los grupos de FC y de MTA, el 100% de los dientes fueron evaluados cl&iacute;nica y radiol&oacute;gicamente con &eacute;xito durante todas las citas de seguimiento. En el grupo de HC, se detect&oacute; radiogr&aacute;ficamente reabsorci&oacute;n interna, en cinco dientes (35,7%) en los 3 meses de seguimiento. Despu&eacute;s de 6 meses, seis dientes (42,9%), ten&iacute;an evidencia radiogr&aacute;fica de fracaso con reabsorci&oacute;n, destrucci&oacute;n del hueso alveolar y furca con radiolucidez en el mismo grupo del HC, por otra parte hay controversia sobre su aplicaci&oacute;n en pulpotom&iacute;as de dientes deciduos debido a la posibilidad de reabsorci&oacute;n interna.<sup>23</sup></p>      <p><b>Recubrimiento pulpar indirecto (RPI)</b></p>      <p>La t&eacute;cnica de RPI sigue siendo estudiada por muchos autores, es as&iacute; como Fagundes y colaboradores<sup>60</sup> describen, a trav&eacute;s de un reporte de caso, utilizando HC, c&oacute;mo se logra la conservaci&oacute;n exitosa de la vitalidad pulpar de un molar permanente con caries, en un paciente de 16 a&ntilde;os, al que se le hizo seguimiento de 4 a&ntilde;os; cabe agregar que existe una relaci&oacute;n directa entre el grado de citotoxicidad de determinado material y el &eacute;xito de este tipo de procedimientos, por lo que Modena y colaboradores<sup>61</sup> demuestran, a trav&eacute;s de una revisi&oacute;n, que el HC es el material de elecci&oacute;n cuando se trata de mayor biocompatibilidad y menor grado de citotoxicidad, comparado con sistemas adhesivos, las resinas y los cementos de ion&oacute;mero de vidrio.<sup>62, 63</sup> Estos autores no mencionan al MTA, que tiene comprobada su biocompatibilidad con los tejidos humanos.</p>      <p>Conforme son referidos en la literatura, tanto en estudios in vitro como in vivo, el MTA demostr&oacute; ser el material indicado para recubrimientos pulpares directos e indirectos, por su capacidad excelente de sellado pulpar y biocompatibilidad para prevenir toxicidad e irritabilidad a los tejidos, as&iacute; como la inducci&oacute;n y proliferaci&oacute;n celular, regeneraci&oacute;n del cemento y formaci&oacute;n de puente dentin&aacute;rio.<sup>64-66</sup></p>      <p><b>Fundamentos biol&oacute;gicos de la respuesta cl&iacute;nica del &oacute;rgano dentino pulpar</b></p>      <p>El HC ha sido ampliamente utilizado para inducir la regeneraci&oacute;n de la dentina mediante la formaci&oacute;n de puente dentinario en los lugares de exposici&oacute;n de la pulpa despu&eacute;s de una lesi&oacute;n del tejido dental; sin embargo, los procesos biol&oacute;gicos que subyacen en estos eventos no eran claros; Graham y colaboradores,<sup>67</sup> en su estudio sobre el efecto del HC en la solubilizaci&oacute;n de los componentes bioactivos de la matriz de dentina implicados en la formaci&oacute;n del puente dentinario, proporcionan una explicaci&oacute;n racional para la acci&oacute;n del HC durante el recubrimiento pulpar, en el que las actividades celulares pueden ser mediadas a trav&eacute;s de la liberaci&oacute;n de factores de crecimiento como BMP, TGF-beta1, col&aacute;geno-1 alfa y la expresi&oacute;n de genes y otras mol&eacute;culas bioactivas a partir de la dentina y del HC.</p>      <p>En la presencia de humedad, el MTA se disocia en un gel hidratado de silicato de calcio lo que puede explicar el &eacute;xito cl&iacute;nico de este material en los procesos biol&oacute;gicos de reparaci&oacute;n pulpar.<sup>56</sup> Por otro lado, el proceso de reparaci&oacute;n dentinaria puede estar relacionado con una reacci&oacute;n f&iacute;sico-qu&iacute;mica que ocurre entre el MTA y el diente como ha sido descrito por Sarkar y colaboradores.<sup>65</sup> Seg&uacute;n los autores; el MTA es un material bioactivo que en contacto con la dentina forma en la interface del diente/material compuestos de hidroxiapatita.</p>      <p><b>Obturaci&oacute;n endod&oacute;ntica con hidr&oacute;xido de calcio</b></p>      ]]></body>
<body><![CDATA[<p>Una gran variedad de selladores de conductos radiculares se han recomendado para este uso, en combinaci&oacute;n con materiales de relleno. Estos materiales deben tener propiedades f&iacute;sico-qu&iacute;micas satisfactorias, as&iacute; como la biocompatibilidad. Al estudiar los efectos citot&oacute;xicos y la biocompatibilidad a largo plazo de tres tipos de selladores (a base de resinas, de &oacute;xido de zinc y de HC), en ligamento periodontal humano, se encontr&oacute; que el material sellador basado en el HC, ofreci&oacute; una respuesta m&aacute;s favorable a los tejidos perirradiculares.<sup>68</sup> La genotoxicidad de estos materiales fue evaluada por Huang T-H y colaboradores<sup>69</sup> a trav&eacute;s de un estudio con electroforesis.    <p>      <p>Los resultados se obtuvieron mediante un an&aacute;lisis de varianza para comparar los distintos materiales de obturaci&oacute;n. El mayor nivel de da&ntilde;o en el ADN fue inducido por los materiales a base de resina, el obturador basado en &oacute;xido de zinc, no siempre provoc&oacute; aumento en la genotoxicidad, pero ese efecto no se evidenci&oacute; con el material basado en HC (Sealapex).</p>      <p>Se ha descrito in vitro el efecto del HC como obturante de conductos radiculares; para relacionarlo con la resistencia a la fractura microtensil (MTF) de los dientes, se prepararon con instrumentos rotatorios un total de 40 incisivos superiores permanentes extra&iacute;dos, libres de enfermedad y los obturaron con HC. Los dientes se almacenaron en un ambiente h&uacute;medo por 7, 28 y 84 d&iacute;as. Como grupo control, 10 dientes se obturaron solo con gutapercha. Como resultado se observ&oacute; que la obturaci&oacute;n de conductos con HC facilita la MTF de los dientes en 13,9 Mpa luego de 77 d&iacute;as. El debilitamiento de la dentina de 23 a 43,9% despu&eacute;s de la obturaci&oacute;n con HC proporciona evidencia convincente para revaluar el uso de este material en la terapia endod&oacute;ntica.<sup>70</sup> Quiere decir que la obturaci&oacute;n de conductos radiculares con HC produce debilitamiento de los dientes despu&eacute;s de un periodo de 70 dias.<sup>71, 72</sup></p>      <p><b>Controversias</b></p>      <p>Seg&uacute;n los estudios de Rosenberg y colaboradores<sup>70</sup> el HC no es un buen material de obturaci&oacute;n de conductos radiculares; sin embargo, Huang y colaboradores,<sup>68</sup> en un estudio in vitro, determinaron la citotoxicidad en el ligamento periodontal humano de tres tipos diferentes de selladores de conductos radiculares uno a base de resina (AH26 y AHPlus), otro a base de &oacute;xido de zinc-eugenol (Canals, Endomethansone y N2) y uno basado en el HC (Sealapex), los resultados confirmaron que los obturadores de conductos constantemente se disuelven cuando son expuestos a un ambiente acuoso durante periodos prolongados de tiempo, lo que podr&iacute;a causar reacciones citot&oacute;xicas. El material basado en el HC ofreci&oacute; una respuesta m&aacute;s favorable a los tejidos perirradiculares. Otros autores expresan que otros medicamentos pueden tener mayor potencial<sup>73</sup> que el HC como lo son el paramonoclorofenol-alcanforado, los corticoides, antibi&oacute;ticos y asociaciones antibi&oacute;tico-corticoide.</p>      <p><b>Efecto bactericida</b></p>      <p>El HC sigue siendo utilizado como desinfectante local en endodoncia. La infecci&oacute;n del conducto radicular es predominante en bacterias anaerobias que utilizan los restos de tejidos y prote&iacute;nas del suero como nutrientes. Varios estudios han demostrado mayor tasa de &eacute;xito en los casos en que el canal est&aacute; libre de bacterias cuando se obtura.<sup>74</sup></p>      <p>El HC es el medicamento recomendado para el tratamiento de la infecci&oacute;n del conducto radicular. Su mecanismo de acci&oacute;n antimicrobiano est&aacute; influido por la velocidad de disociaci&oacute;n en iones de calcio y de iones hidroxilo, en un ambiente de pH alto que inhibe la actividad enzim&aacute;tica que es esencial para la vida microbiana; es decir, el metabolismo, el crecimiento y la divisi&oacute;n celular.<sup>75, 76</sup> Los efectos letales del HC en las c&eacute;lulas bacterianas se debe probablemente a la desnaturalizaci&oacute;n de las prote&iacute;nas y los da&ntilde;os en el ADN y en las membranas citoplasm&aacute;tica.<sup>77</sup></p>      <p>Hoy en d&iacute;a se ha demostrado que la preparaci&oacute;n mec&aacute;nica sola no garantiza la completa recuperaci&oacute;n, por lo que se necesita aplicar un medicamento.<sup>78</sup> La eliminaci&oacute;n de los microorganismos no es uniforme debido a la diferente vulnerabilidad de las especies involucradas.<sup>79</sup> Las bacterias anaerobias Gram negativas pigmentadas, como <i>Porphyromonas gingivalis</i>, se han vinculado a los signos y s&iacute;ntomas de dientes infectados. Sin embargo, los microorganismos facultativos, tales como el <i>Enterococus faecalis, Actinomyces spp</i>, e incluso <i>Candida albicans</i>, son considerados por muchos las especies m&aacute;s resistentes en la cavidad oral, y una posible causa del fracaso en el tratamiento endod&oacute;ntico.<sup>80, 81</sup> Los microorganismos y sus productos derivados pueden difundir la infecci&oacute;n del conducto radicular a trav&eacute;s de varias v&iacute;as, incluyendo el foramen apical, los canales laterales y accesorios con la promoci&oacute;n de una lesi&oacute;n periodontal adyacente.<sup>82</sup></p>     ]]></body>
<body><![CDATA[<p>Para trabajar con un agente antimicrobiano efectivo, este debe actuar tanto en el conducto como hasta una cierta distancia, en los t&uacute;bulos dentinarios y en una situaci&oacute;n ideal debe llegar a la superficie externa de la ra&iacute;z.<sup>83</sup></p>      <p>El HC es un excelente medicamento con efecto antimicrobiano; sin embargo, se ha sugerido el empleo de numerosos veh&iacute;culos para asociarlo, a fin de mejorar sus propiedades. Como se requiere un tiempo ideal de acci&oacute;n para la efectiva destrucci&oacute;n de las bacterias por contacto directo en la luz del conducto radicular y por contacto indirecto en los t&uacute;bulos dentinarios, m&aacute;s importante que el efecto antimicrobiano del veh&iacute;culo empleado, ser&aacute; su capacidad de solubilidad, a fin de que act&uacute;e de manera sin&eacute;rgica, lo ayude a difundir y a disociarse r&aacute;pidamente, permiti&eacute;ndole llegar a aquellos conductos laterales, que son inaccesibles a la preparaci&oacute;n mec&aacute;nica, mejorando en consecuencia la propiedad antimicrobiana que el HC tiene per se. Mientras mayor es la velocidad de disociaci&oacute;n y difusi&oacute;n de los iones hidroxilos de las pastas de HC, mayor ser&aacute; el efecto antimicrobiano, logr&aacute;ndose esto con los veh&iacute;culos hidrosolubles.<sup>76</sup></p>      <p>Entre las sustancias utilizadas como veh&iacute;culo para el HC, se incluyen el agua destilada, la soluci&oacute;n salina y la glicerina. Recientemente, la clorhexidina ha demostrado ser un medio qu&iacute;mico eficaz para la desinfecci&oacute;n<sup>84</sup> por su acci&oacute;n antimicrobiana y su adsorci&oacute;n a los tejidos duros dentales con una liberaci&oacute;n gradual y prolongada en niveles terap&eacute;uticos<sup>85-89</sup> la han sugerido como medicaci&oacute;n intraconducto.</p>      <p><i>Candida albicans</i> y <i>Enterococcus faecalis</i> han demostrado ser resistentes a la acci&oacute;n antimicrobiana de HC, pero son sensibles al gluconato de clorhexidina. Ballal V y colaboradores<sup>90</sup> investigaron in vitro la eficacia antimicrobiana de la pasta de HC, gel de clorhexidina al 2% y su combinaci&oacute;n, frente a <i>Candida albicans</i> y <i>Enterococcus faecalis</i>, concluyendo que para evitar fracasos en los tratamientos de endodoncia, el gel de clorhexidina al 2%, puede ser un medicamento m&aacute;s efectivo que la pasta de HC.</p>      <p>Al determinar la influencia de los veh&iacute;culos<sup>91</sup> en la acci&oacute;n antimicrobiana del HC, se concluy&oacute; que en las condiciones del estudio de Estrela y colaboradores,<sup>92</sup> los diversos veh&iacute;culos relacionados con las pastas de HC no influyeron en el tiempo requerido para la inactivaci&oacute;n microbiana.</p>      <p>Aunque estudios in vivo han indicado al HC como el medicamento intraconducto m&aacute;s efectivo de uso m&uacute;ltiple,<sup>93</sup> otros han demostrado que el yoduro de potasio (IKI) y la clorhexidina (CHX) son eficaces contra bacterias resistentes al HC, complementando la actividad antibacteriana del HC.<sup>94-99</sup> Las preparaciones de HC con IKI o CHX, por lo tanto, pueden ser una forma de mejorar la eficacia del tratamiento intraconducto.</p>      <p>Evans y colaboradores,<sup>100</sup> hicieron un estudio in vitro para medir el efecto antibacteriano de la combinaci&oacute;n de HC con IKI o con CHX contra <i>E. faecalis</i>.<sup>73</sup> Los resultados del estudio mostraron los beneficios mediante la combinaci&oacute;n de HC, ya sea con IKI o la CHX.</p>      <p>El uso generalizado del HC en gran medida, se basa en la larga duraci&oacute;n de la alcalinidad y el bloqueo a la difusi&oacute;n de nutrientes a las bacterias residuales. Estas propiedades no se vieron afectadas por la adici&oacute;n de CHX o IKI, aumentando evidentemente el efecto antibacteriano de la medicaci&oacute;n.<sup>98</sup></p>      <p><i>Actinomyces israelii</i> ha sido repetidamente citado como una causa de fracaso del tratamiento endod&oacute;ntico. Barnard y colaboradores,<sup>101</sup> investigaron el efecto antimicrobiano de este importante pat&oacute;geno, con medicamentos utilizados en la limpieza de conductos como el hipoclorito de sodio e HC. Se encontr&oacute; que tanto la soluci&oacute;n de hipoclorito de sodio al 1% como la de HC son muy efectivas en la eliminaci&oacute;n del <i>A. israelii</i> como microorganismo planct&oacute;nico.</p>      <p>El HC es un excelente antimicrobiano, como medicaci&oacute;n intraconducto, ya que controla la infecci&oacute;n en el sistema de conductos radiculares de dientes necr&oacute;ticos y favorece el proceso de reparaci&oacute;n periapical.<sup>102</sup> Asimismo, existen microorganismos tales como <i>E. faecalis</i>, resistentes al HC, vulnerables a la acci&oacute;n del gluconato de clorhexidina cuando son estudiados en su estado planct&oacute;nico.<sup>103</sup> La correcta elecci&oacute;n de los agentes antimicrobianos para la medicaci&oacute;n entre citas, es tan importante como la instrumentaci&oacute;n y la irrigaci&oacute;n de los canales para eliminar los pat&oacute;genos etiol&oacute;gicos. De los diferentes medicamentos el HC es quiz&aacute;s el m&aacute;s utilizado<sup>104-107</sup> y su efecto antibacteriano se debe principalmente a la liberaci&oacute;n de radicales libres (hidroxilo)<sup>105</sup> y a que mantienen el pH b&aacute;sico.<sup>108, 109</sup> Algunos investigadores han encontrado bacterias viables dentro de los t&uacute;bulos dentinarios, incluso despu&eacute;s de largos periodos de medicaci&oacute;n con HC.<sup>95, 110</sup> Curiosamente, Haapasalo y colaboradores,<sup>111</sup> encontraron que el efecto antimicrobiano del HC se podr&iacute;a neutralizar in vitro por el polvo de la dentina.</p>      ]]></body>
<body><![CDATA[<p>Tang y colaboradores<sup>112</sup> evaluaron los microorganismos residuales luego de un tratamiento convencional de endodoncia, utilizando medicamentos como Septomixine o HC; encontraron que ninguno de los dos puede inhibir efectivamente el crecimiento bacteriano residual en todos los conductos durante los intervalos entre las citas. Se necesitan m&aacute;s investigaciones para determinar cu&aacute;l es el medicamento m&aacute;s adecuado para las infecciones del conducto radicular.<sup>113</sup></p>      <p>Soriano y colaboradores<sup>114</sup> indican el uso limitado del HC en la terapia convencional de endodoncia, ya que no elimina todo el espectro de microorganismos asociados con la necrosis pulpar. En estos casos las especies m&aacute;s prevalentes son: <i>F. nucleatum spp. Borriela vicentii, C. sputigena, C. ochracea, S. constellatus, V. parvula, P. gingivalis, P. melaninogenica y S. sanguis</i>. La mayor&iacute;a de los microorganismos se redujeron despu&eacute;s del tratamiento, especialmente: <i>A. gerencseriae, A. israelii,A. naeslundii, C. gingivalis, C. ochracea, P. gingivalis, S. noxia, sanguis</i> y <i>S. oral</i>. Por el contrario,<i> A. actinomycetemcomitans, C. sputigena</i> y <i>E. corrodens</i>, aumentaron en n&uacute;mero despu&eacute;s de la terapia con HC. El HC cuenta con amplia gama de actividad antimicrobiana frente a pat&oacute;genos comunes en endodoncia, pero es menos eficaz frente a <i>Enterococcus faecalis</i> y <i>Candida albicans</i>. Adem&aacute;s, su efecto sobre las biopel&iacute;culas microbianas tambi&eacute;n es objeto de controversia.</p>      <p>La creencia de que el tratamiento endod&oacute;ntico de dientes necr&oacute;ticos debe ser hecho en varias citas, debido a que ya ha ocurrido propagaci&oacute;n y proliferaci&oacute;n bacteriana en todo el sistema de conductos,<sup>115-117</sup> postulan que en una sola cita es imposible desinfectar completamente el sistema de conductos radiculares, por lo que proponen la utilizaci&oacute;n de medicaciones intraconducto con HC para eliminar las bacterias que no pudieron ser eliminadas durante la preparaci&oacute;n biomec&aacute;nica.<sup>102, 118</sup></p>      <p>Sin embargo, hay estudios que reportan que aun utilizando HC no se logra la desinfecci&oacute;n completa del conducto radicular, e incluso a los 7 d&iacute;as de colocado es posible que ocurra recolonizaci&oacute;n bacteriana a niveles similares a los que se encontraban previos a la instrumentaci&oacute;n del conducto.<sup>93, 107, 119</sup> Caviedes y colaboradores<sup>120</sup> presentan una revisi&oacute;n sobre la evidencia disponible en la literatura cient&iacute;fica acerca de la efectividad de la endodoncia en una sola cita, basada tanto en la incidencia de exacerbaciones, como en la reparaci&oacute;n periapical a largo plazo y concluyen que todos los dientes pueden tratarse adecuadamente en una cita, sin importar su estado pulpar y periapical; Aunque el n&uacute;mero de conductos, el tiempo disponible y la habilidad del operador son factores que pueden dificultar la conclusi&oacute;n del tratamiento en la misma cita.</p>      <p>Existen muchos estudios,<sup>92, 104, 105</sup> que reportan que el HC tiene efectos letales sobre las bacterias. Sin embargo, estos estudios fueron hechos in vitro y en contacto directo con las bacterias, lo cual en el sistema de conductos radiculares (por su anatom&iacute;a compleja) generalmente no es posible. Otro aspecto que debe resaltarse, es la ineficacia del HC para eliminar las bacterias dentro de los t&uacute;bulos dentinales.<sup>121</sup></p>      <p>Se ha reportado que diferentes preparaciones de HC son incapaces de eliminar <i>E. faecalis</i> de los t&uacute;bulos dentinales, aun cuando este se encuentra en la entrada de los t&uacute;bulos.<sup>122, 123</sup></p>      <p>Para que el HC pueda ser efectivo en eliminar las bacterias presentes en los t&uacute;bulos dentinales, los iones hidroxilo deben difundirse dentro de la dentina en concentraciones elevadas. Se ha reportado que la alta tensi&oacute;n superficial del HC no le permite entrar en los t&uacute;bulos dentinales. Esto ha hecho, que se intente mezclar el HC con gran n&uacute;mero de veh&iacute;culos, por dos razones principalmente, la primera, modificar su tensi&oacute;n superficial, y la segunda, prolongar la liberaci&oacute;n i&oacute;nica.<sup>124-127</sup> Se ha reportado que la soluci&oacute;n anest&eacute;sica es el veh&iacute;culo m&aacute;s favorable para reducir la tensi&oacute;n superficial del HC.<sup>128</sup></p>      <p><b>Inducci&oacute;n de tejido duro</b></p>      <p>Por la capacidad del HC para formar puentes dentinarios se ha propuesto su aplicaci&oacute;n para inducir el cierre apical en dientes inmaduros y en la reparaci&oacute;n de perforaciones. En la actualidad se ha demostrado que el MTA tambi&eacute;n tiene esta capacidad.</p>      <p><b>Tratamiento en dientes fracturados y perforaciones</b></p>      ]]></body>
<body><![CDATA[<p>El HC ha sido incluido en formulaciones que se utilizan durante el tratamiento de perforaciones, fracturas y reabsorci&oacute;n radicular, adem&aacute;s tienen un papel en la traumatolog&iacute;a dental, despu&eacute;s de la avulsi&oacute;n y las luxaciones.<sup>116</sup> El problema encontrado con este m&eacute;todo ha sido el efecto de debilitamiento de la dentina por el HC, lo que origina el riesgo de fracturas de la ra&iacute;z a nivel cervical.<sup>129-131</sup> El HC ha demostrado su capacidad para inducir tejido duro en apexificaci&oacute;n, en las fracturas radiculares y su efecto en la reabsorci&oacute;n externa relacionada con infecciones.<sup>132-136</sup> Un material ideal debe sellar las v&iacute;as de comunicaci&oacute;n entre el sistema de conductos radiculares, la perforaci&oacute;n, la fractura y sus tejidos circundantes, no debe ser t&oacute;xico, ni cancer&iacute;geno, debe ser biocompatible, insoluble en los l&iacute;quidos tisulares, y dimensionalmente estable. El MTA se recomend&oacute; inicialmente indicando que ten&iacute;a estas caracter&iacute;sticas "ideales", adem&aacute;s tambi&eacute;n ha sido recomendado para el recubrimiento pulpar; pulpotom&iacute;a, formaci&oacute;n de la barrera apical en dientes con &aacute;pices abiertos; la reparaci&oacute;n de perforaciones y la obturaci&oacute;n de conductos radiculares.<sup>131</sup></p>      <p>En un estudio de laboratorio, Hakki y colaboradores,<sup>132</sup> analizaron la respuesta de los fibroblastos del ligamento periodontal (PDL) de perforaciones radiculares restauradas con diferentes materiales como amalgama, Dyract, IRM, Super Bond C y B y el MTA. La microscop&iacute;a electr&oacute;nica revel&oacute; que el grupo de MTA ten&iacute;a la mayor poblaci&oacute;n de c&eacute;lulas viables en las perforaciones restauradas en comparaci&oacute;n con los otros materiales.</p>      <p>Las fracturas radiculares son frecuentes. El manejo de las fracturas verticales y horizontales es diferente, as&iacute; como su forma de diagn&oacute;stico y su pron&oacute;stico. Dentro de las causas de las fracturas verticales est&aacute;n la iatrogenia (excesivo trabajo en el conducto, excesiva compactaci&oacute;n durante la condensaci&oacute;n, colocaci&oacute;n de postes con espacios, o bien, la colocaci&oacute;n de estos sin una buena relaci&oacute;n corono-radicular), el traumatismo f&iacute;sico, el bruxismo, entre otras. Las fracturas se manejan como las apexificaciones, pero requieren el diagn&oacute;stico de la parte coronal. Cuando son verticales el pron&oacute;stico es malo.</p>      <p><b>Apexificaci&oacute;n</b></p>      <p>El traumatismo dental en dientes con ra&iacute;ces no formadas completamente puede causar necrosis de la pulpa, detenci&oacute;n de la formaci&oacute;n de las ra&iacute;ces y el posterior desarrollo de lesiones periapicales.</p>      <p>En su tratamiento puede buscarse la inducci&oacute;n de un cierre apical, por medio de la aplicaci&oacute;n de biomateriales intraconducto para inducir la reparaci&oacute;n periapical, en un procedimiento llamado apexificaci&oacute;n.133</p>      <p>En la apexificaci&oacute;n, por medio de desbridamiento qu&iacute;mico- mec&aacute;nico y el mantenimiento, renovando peri&oacute;dicamente, el HC, era alternativa de elecci&oacute;n para el sellado biol&oacute;gico de una amplia apertura del foramen, aunque en algunas ocasiones no se lograba.<sup>134, 137, 138</sup> Ahora es el MTA y se hace en una sola cita.</p>      <p>&Ccedil;aliskan y T&uuml;rk&uuml;n <sup>139</sup> publicaron un caso cl&iacute;nico de un incisivo central superior con el &aacute;pice ampliamente abierto y con una gran lesi&oacute;n periapical que se form&oacute; como resultado de la necrosis pulpar debido a un traumatismo sufrido hac&iacute;a doce a&ntilde;os. Despu&eacute;s de un tratamiento con HC se observ&oacute; &eacute;xito total a los 15 meses. En otro estudio hecho por Vellore, <sup>138</sup> se enfatiza sobre las bondades que sigue teniendo el HC en dientes despulpados con &aacute;pice abierto.</p>      <p>Mohammadi y Dummer<sup>77</sup> reportan los m&uacute;ltiples beneficios que tiene el HC en tratamientos de apexificaci&oacute;n que tiene mayor &eacute;xito a largo plazo, por sus propiedades antimicrobianas y su capacidad para estimular la formaci&oacute;n de nuevo hueso.</p>      <p>Tradicionalmente se han hecho procedimientos de apexificaci&oacute;n que pueden tardar un a&ntilde;o o m&aacute;s. Se ha demostrado que estos dientes son propensos a la fractura y pueden perderse antes o despu&eacute;s de la finalizaci&oacute;n de un largo periodo de apexificaci&oacute;n con HC.<sup>140</sup> Chala y colaboradores141 hicieron una revisi&oacute;n sistem&aacute;tica cuantitativa, para comparar la eficacia del MTA y el HC como materiales utilizados en el tratamiento endod&oacute;ntico de los dientes permanentes inmaduros. Obtuvieron como resultado que ambos pueden ser utilizados.</p>      ]]></body>
<body><![CDATA[<p><b>Controversias</b></p>      <p>Se ha reportado que el HC ha sido exitoso en la inducci&oacute;n de cierre apical en un gran n&uacute;mero de formulaciones, relacionando la formaci&oacute;n de un cierre apical, con el efecto antibacterial a largo plazo, ya que se ha observado que la formaci&oacute;n de tejido calcificado ocurre en ausencia de microorganismos.<sup>142</sup></p>      <p>Tambi&eacute;n se ha considerado que la alcalinidad del material, puede actuar como buffer para las reacciones &aacute;cidas inflamatorias, favoreciendo el remodelado &oacute;seo, ya que se neutralizan los &aacute;cidos producidos por los osteoclastos y los macr&oacute;fagos.<sup>143</sup> A este respecto, es importante hacer notar que es poco probable que el calcio liberado por la disociaci&oacute;n del HC pueda ser utilizado para la formaci&oacute;n de una barrera apical, puesto que es un ion muy inestable, y para poder ser &uacute;til en la formaci&oacute;n de este tejido calcificado se necesita de un aporte constante de calcio, el cual puede provenir por v&iacute;a hemat&oacute;gena.<sup>143</sup> Por &uacute;ltimo, tambi&eacute;n se ha reportado que los remanentes de la vaina epitelial radicular de Hertwig que se mantengan intactos, pueden contribuir a que se produzca el cierre apical.<sup>144</sup></p>      <p>Meligy y Avery, <sup>145</sup> hicieron un estudio donde compararon cl&iacute;nica y radiogr&aacute;ficamente dos materiales utilizados para inducir el selle de ra&iacute;ces de dientes permanentes con necrosis pulpar y &aacute;pices inmaduros (apexificaci&oacute;n): el MTA y el HC.</p>      <p>Las evaluaciones de seguimiento revelaron el fracaso debido a la inflamaci&oacute;n perirradicular persistente y dolor a la percusi&oacute;n, detectado a los 6 y 12 meses de evaluaci&oacute;n posoperatoria en dos dientes tratados con HC. Los 13 dientes restantes tuvieron cl&iacute;nica y radiogr&aacute;ficamente &eacute;xito luego de 12 meses de la intervenci&oacute;n. Ninguno de los dientes tratados con MTA, mostr&oacute; patolog&iacute;a cl&iacute;nica ni radiol&oacute;gica. Este estudio lleg&oacute; a la conclusi&oacute;n que el MTA es un sustituto adecuado para el HC en los procedimientos de apexificaci&oacute;n.</p>      <p>Los estudios de microscop&iacute;a electr&oacute;nica sugieren que las propiedades f&iacute;sicas del MTA son esenciales en el &eacute;xito del tratamiento.<sup>146</sup> Nair y colaboradores<sup>147</sup> confirman que el MTA es de m&aacute;s f&aacute;cil aplicaci&oacute;n cl&iacute;nica y tiene &eacute;xito en los procedimientos de terapia pulpar vital, tanto en animales<sup>148, 149</sup> como en humanos.<sup>150-154</sup> El MTA es un material con capacidad de selle mejor que la amalgama y el &oacute;xido de zinc.<sup>152, 155, 156</sup> Adem&aacute;s, se ha demostrado su capacidad para estimular la liberaci&oacute;n de citoquinas de las c&eacute;lulas del tejido &oacute;seo, lo que indica que promueve activamente la formaci&oacute;n de tejido duro.<sup>152</sup></p>      <p>Torabinejad y Chivian<sup>156</sup> dicen que el HC se disocia en dos iones con efectos totalmente contrarios, ya que mientras el ion Ca<sup>++</sup> estimula la proliferaci&oacute;n celular, el ion OH<sup>-</sup> act&uacute;a suprimiendo la actividad celular y provocando un arresto en los procesos vitales pulpares. Esto hace pensar que no es el HC como tal el que estimula la formaci&oacute;n del puente dentinario, sino m&aacute;s bien es el potencial de reparaci&oacute;n del tejido pulpar que trata de defenderse ante la injuria qu&iacute;mica a la que es sometido.<sup>157, 158</sup></p>      <p><b>Reabsorciones radiculares internas y externas</b></p>      <p>La reabsorci&oacute;n radicular inflamatoria sigue siendo una de las complicaciones m&aacute;s comunes del trauma dental. Recientemente, con el desarrollo de materiales que no solo son biocompatibles, sino tambi&eacute;n bioinductivos, se ha desplazado la idea de la simple conservaci&oacute;n, para hacer &eacute;nfasis en la regeneraci&oacute;n del tejido pulpar remanente; siendo el MTA un material que ha demostrado un enorme potencial para la regeneraci&oacute;n.<sup>9</sup> G&uuml;zeler y colaboradores,<sup>159</sup> describieron los beneficios del MTA en el tratamiento de dientes inmaduros fracturados que presentan adem&aacute;s lesi&oacute;n periapical, y observaron detenci&oacute;n de la reabsorci&oacute;n y cicatrizaci&oacute;n completa de la zona periapical, con restablecimiento del espacio del ligamento periodontal, con seguimientos a los 12 y 24 meses. Cuando se trata de reabsorciones externas, resultado de avulsiones, es de elecci&oacute;n el uso de MTA como el material de mayor eficacia en comparaci&oacute;n con HC; <sup>160</sup> sin embargo, otros autores contin&uacute;an apoyando su uso como complemento para el manejo de las reabsorciones internas y externas.<sup>161-163</sup></p>      <p><b>Controversias</b></p>      ]]></body>
<body><![CDATA[<p>Para que el HC logre los efectos antes mencionados, debe tener alto grado de difusi&oacute;n al peri&aacute;pice y a la dentina externa por penetraci&oacute;n a trav&eacute;s de los t&uacute;bulos dentinales, lo cual, debido a la gran reactividad de los iones OH-, al sistema buffer de la dentina y a su alta tensi&oacute;n superficial es improbable.<sup>125, 164-167</sup></p>      <p>Seg&uacute;n varios estudios,<sup>163, 168-171</sup> el HC es el material de elecci&oacute;n para el manejo de la reabsorci&oacute;n radicular al ser utilizado como medicaci&oacute;n intraconducto, dado que su alto pH tiene la capacidad de destruir las bacterias y adem&aacute;s alterar el ambiente local de los sitios de reabsorci&oacute;n en la superficie radicular a trav&eacute;s de los t&uacute;bulos dentinales. Sin embargo, ya se discuti&oacute; la dificultad de cambiar el pH con una medicaci&oacute;n intraconducto de HC, en particular en un proceso de reabsorci&oacute;n externa, donde el pH en la superficie radicular se ha calculado que se encuentra en 4,5.</p>      <p>La apexificaci&oacute;n con HC sigue siendo una buena alternativa de tratamiento para algunos autores, pero el gran consenso en este momento es el uso del MTA.<sup>141, 146</sup></p>      <p><b>El HC como agente desensibilizante</b></p>      <p>La sensibilidad dental es un cuadro cl&iacute;nico muy com&uacute;n. Es definido como un dolor ocasionado por la exposici&oacute;n dentinaria, en respuesta a est&iacute;mulos t&eacute;rmicos, qu&iacute;micos, t&aacute;ctiles y osm&oacute;ticos. En algunas personas se debe a una anomal&iacute;a del desarrollo de los tejidos dentarios, cuando el cemento y el esmalte, que normalmente cubren la dentina, no lo hacen.</p>      <p>En general, la hipersensibilidad dentinaria es multifactorial. <sup>172</sup> Independientemente de la etiolog&iacute;a de la exposici&oacute;n de la dentina, una caracter&iacute;stica que parece ser com&uacute;n, es la exposici&oacute;n de los t&uacute;bulos dentinarios, que sirven de v&iacute;nculo directo entre el medio externo y la pulpa dentaria. Si los t&uacute;bulos no est&aacute;n expuestos, parece poco probable que la sensibilidad se d&eacute;. De ah&iacute; que una vez la sensibilidad se ha establecido, la pulpa puede ser irreversiblemente sensible. El tratamiento es, por lo tanto, no solo dirigido a restaurar la impermeabilidad original de los t&uacute;bulos, sino tambi&eacute;n del control de los elementos neurales dentro de la pulpa, para evitar los efectos estimulantes externos.<sup>173, 174</sup></p>      <p>La hipersensibilidad dental se trata m&aacute;s com&uacute;nmente con la aplicaci&oacute;n de barnices, antiinflamatorios, procedimientos de obturaci&oacute;n tubular o el uso de resina de restauraci&oacute;n.<sup>175</sup> Diferentes sistemas no invasivos y reversibles, han sido recomendados para el tratamiento de esta condici&oacute;n con base en su capacidad para ocluir los t&uacute;bulos dentinarios. Dos m&eacute;todos utilizados para el cierre de los t&uacute;bulos dentinarios son la aplicaci&oacute;n de la suspensi&oacute;n de HC<sup>176, 177</sup> y la aplicaci&oacute;n de un imprimador a base de glutaraldeh&iacute;do (PIB).</p>      <p>La hipersensibilidad dental despu&eacute;s del tallado para una corona completa se caracteriza por dolor, que surge como resultado de la transmisi&oacute;n de est&iacute;mulos a trav&eacute;s de la dentina expuesta, es decir, por el mecanismo hidrodin&aacute;mico.<sup>178</sup> Adem&aacute;s es frecuente la p&eacute;rdida de los provisionales<sup>179</sup> o desadaptaci&oacute;n de los mismos, la penetraci&oacute;n de microorganismos en los t&uacute;bulos dentinarios pueda ocurrir y ocasionar dolor o incluso enfermedad pulpar.<sup>180</sup> En un estudio in vivo, Wolfart y colaboradores,<sup>181</sup> evaluaron el efecto de una suspensi&oacute;n de HC para reducir la sensibilidad dental y llegaron a la conclusi&oacute;n que hay reducci&oacute;n de esta. Es importante aclarar que al desensibilizar los dientes despu&eacute;s del tallado, el uso del HC no altera el ajuste de la restauraci&oacute;n final.<sup>182, 183</sup> Pashley y colaboradores<sup>184</sup> demostraron el efecto desensibilizante del HC para sellar la superficie de la dentina y reduce en 48% la permeabilidad tubular en comparaci&oacute;n con la dentina no tratada. Se recomienda el uso del HC para los dientes que quedan sensibles despu&eacute;s de la preparaci&oacute;n de una corona completa.<sup>185, 186</sup> Se ha demostrado que el HC en pasta tiene buen efecto desensibilizante en las superficies radiculares hipersensibles.<sup>187-189</sup></p>      <p>En las revisiones de Bartold<sup>189</sup> y de McFall<sup>190</sup> se hace referencia a varios estudios que indican la eficacia de cubrir los t&uacute;bulos dentinarios con HC en la eliminaci&oacute;n de la hipersensibilidad dentinal. Sin embargo, Scherman y Jacobsen<sup>191</sup> dicen que el HC puede irritar el tejido gingival. Resulta importante resaltar que la mayor parte de los estudios que reportan cambios de pH en la capa externa de la dentina y en la regi&oacute;n periapical son estudios in vitro, hechos en dientes extra&iacute;dos, donde posiblemente el sistema buffer de la dentina est&eacute; alterado y los iones OH<sup>-</sup> posiblemente no tengan con qu&eacute; reaccionar, reduciendo as&iacute; los obst&aacute;culos para difundirse a trav&eacute;s del sistema de conductos radiculares.<sup>191-193</sup></p>      <p><b>Controversias</b></p>      ]]></body>
<body><![CDATA[<p>Hay amplia variedad de productos para tratar la sensibilidad; algunos parecen ser m&aacute;s eficaces que otros y varios pueden ser aplicados en el hogar, como: el fluoruro de esta&ntilde;o, el fluoruro de sodio, el monofluorofosfato y cloruro de estroncio que han sido ampliamente estudiados y se ha demostrado que son eficaces. En este aspecto tiene desventaja el HC, porque su aplicaci&oacute;n debe ser hecha en el consultorio.</p>      <p>Caviedes y colaboradores<sup>194</sup> concluyen que el HC ha sido el m&aacute;s utilizado en el mundo de la endodoncia actual; sin embargo, su mecanismo de acci&oacute;n no se encuentra bien sustentado. Su alta tensi&oacute;n superficial y su deficiente habilidad para disolver tejidos, no lo hacen un buen candidato para la irrigaci&oacute;n durante la terapia endod&oacute;ntica convencional; debe anotarse adem&aacute;s, que el MTA se proyecta como el material que est&aacute; rompiendo el paradigma del uso cl&iacute;nico predominante del HC en terapia pulpar</b>       <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>CONCLUSIONES</b></font></p>      <p>El MTA, en las &uacute;ltimas dos d&eacute;cadas, comenz&oacute; a tomar el lugar del HC en el tratamiento de una variedad de diagn&oacute;sticos pulpares. Las principales razones para la sustituci&oacute;n, ha sido el efecto retardado del HC para inducir tejidos duros; la calidad de los tejidos duros formados y, finalmente, el efecto de debilitamiento de la dentina, que en algunos casos llevan a fracturas en los dientes a&uacute;n en formaci&oacute;n.</p>      <p>El HC, durante muchas d&eacute;cadas, ha sido el principal material utilizado en recubrimientos pulpares, pulpotom&iacute;a, dientes con formaci&oacute;n radicular incompleta (apexog&eacute;nesis), necrosis pulpar (apexificaci&oacute;n), en dientes con fracturas radiculares y necrosis de la pulpa ubicada en la parte coronal y en los dientes con infecci&oacute;n relacionada con la reabsorci&oacute;n radicular externa.<sup>133</sup> A pesar de su &eacute;xito en muchas de las complicaciones mencionadas, se han observado una serie de deficiencias, demostrando, con la investigaci&oacute;n, mejores resultados del MTA, aunque a&uacute;n sigue utiliz&aacute;ndose el HC.</p>      <p>Los estudios revisados pueden llevar a considerar que ha llegado el momento de sustituir el HC por el MTA, en situaciones tales como recubrimiento pulpar, pulpotom&iacute;a, apexog&eacute;nesis, perforaciones y apexificaci&oacute;n. Antes de llegar a una conclusi&oacute;n en ese sentido, es necesario revisar nuevos estudios de diferentes m&eacute;todos con resultados a largo plazo. Los estudios analizados al momento le dan al MTA un serio respaldo cient&iacute;fico.</p>        <p>&nbsp;</p>      <p><font size="3" face="Verdana"><b>REFERENCIAS</b></font></p>     <p>&nbsp;</p>      ]]></body>
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