Resumo

PINEDA DUQUE, Érika Alejandra; ESCOBAR RESTREPO, Julio César; LATORRE CORREA, Federico  e  VILLARRAGA OSSA, Junes Abdul. COMPARISON OF THE RESISTANCE OF THREE CERAMIC SYSTEMS IN ANTERIOR FIXED PROSTHETIC SEGMENTS. A FINITE ELEMENT ANALYSIS. Rev Fac Odontol Univ Antioq [online]. 2013, vol.25, n.1, pp.44-75. ISSN 0121-246X.

INTRODUCTION: the purpose of this study was to evaluate stress distribution on three-unit fixed partial dentures (FPD) in the anterior region, made of three ceramic systems with connector variations. The study was performed by the finite element method. METHODS: four segments of FPD were modeled; three of them were made on ceramic systems: lithium disilicate, alumina, and zirconia, and the fourth model was of lithium disilicate with a connector of 9 mm² in area. The modeling included three variables: elastic modulus, Poisson's ratio, and ultimate tensile strength. An initial load of 200 N was applied and increased up to 1000 N calculating von Mises, maximum tensile, compressive, and shear stresses. RESULTS AND CONCLUSIONS: all the ceramic systems showed a suitable behavior for FPDs in the anterior area; the structure's elastic modulus influences stress behavior; if it is higher, it reduces stresses in feldspar ceramics and periodontal ligament. We noted that in presence of a connector of 16 mm² in area, the periodontal ligament received greater stresses as a compensation effect, but they significantly decreased in the structure. By reducing the connector area to 9 mm², the stresses increased to 48%, but did not reach yield strength when subjected to loads of 1000 N, providing the system with proper margin tolerance without fracturing.

Palavras-chave : dentures; crowns; ceramics; aluminum oxide.

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