Resumo

MEJIA BRAVO, Richard Milton et al. EX VIVO EVALUATION OF THE RETENTION OF PROCERA^® ZIRCONIA-YTTRIA SYSTEMS WITH DIFFERENT CEMENTS. Rev Fac Odontol Univ Antioq [online]. 2014, vol.26, n.1, pp.44-61. ISSN 0121-246X.

INTRODUCTION: since the specialized literature does not report reliable protocols for cementing zirconia-yttria restorations, the purpose of this study was to perform an ex vivo assessment of the retention by frictional strength of Procera^® zirconia-yttria systems cemented with four materials: Ketac Cem (3M) ESPE), Multilink Automix (Ivoclar Vivadent), Panavia F 2.0 (Kuraray), and RelyX U100 (3M ESPE) on natural teeth. METHODS: We gathered 40 recently extracted third molars, which were disinfected with 0.5% NaOCl and stored in saline solution, embedded in acrylic resin, and cut at a 10° convergence angle per wall with an axial carving of 1.5 mm in depth and 4 mm in height. Impressions were taken with Aquasil Ultra^® Dentsply and cast with type IV plaster, obtaining 40 Procera AllZircon (Nobel Biocare) structures. 10 samples per material were cemented and thermocycled x 5,000 cycles of 15 s. They were then tractioned with a universal testing machine and failure types at the different interfaces were analyzed. One-way multiple-range ANOVA statistical analysis was performed. RESULTS: average retention values in Newtons were 440 N for Ketac Cem, 698 N for Multilink Automix, 686 N for Panavia F 2.0, and 551 N for RelyX U100. Dentin adhesion failure occurred in 53.8% of cases, followed by mixed failure, with 12.82%. CONCLUSIONS: resinous cements with acid phosphate monomers reported higher retention values in comparison with conventional acid-base cements. Adherence to dentin and cement handling can affect the final result.

Palavras-chave : dental porcelain; dental cements; denture retention.

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