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Revista Facultad de Odontología Universidad de Antioquia
versão impressa ISSN 0121-246X
Resumo
ANGEL, NATHALY; ESCOBAR RESTREPO, JULIO CÉSAR; LATORRE CORREA, FEDERICO e VILLARRAGA OSSA, JUNES ABDUL. MECHANICAL BEHAVIOR OF ANTERIOR FIXED PARTIAL DENTURES MADE OF DIFFERENT MATERIALS SUBJECTED TO STATIC AND DYNAMIC LOADS. Rev Fac Odontol Univ Antioq [online]. 2017, vol.29, n.1, pp.96-130. ISSN 0121-246X. https://doi.org/10.17533/udea.rfo.v29n1a6.
Introduction:
the purpose of this study was to assess the mechanical behavior of lithium disilicate, alumina, and zirconia-based ceramic restorations, as well as metal-ceramic restorations, under static and dynamic load, in an upper anterior fixed site.
Methods:
four models of fixed partial dentures (FPD) were designed, representing alumina, zirconia, and metal-ceramic two-layered systems and a lithium disilicate monolithic system, with a 9 mm2 connector. The variables included were elastic modulus, Poisson’s ratio, and ultimate tensile strength. A static load of 100 N was applied up to 800 N, as well as a dynamic load of 100 and 200 N, calculating von Mises stress and maximum and minimum principal stresses.
Results:
all models showed a greater concentration of stress under static and dynamic load on the connector region, without exceeding the maximum tensile stress of metal and ceramic structures. The two-layered models showed greater stress concentration on the veneering ceramic compared with the structure.
Conclusions:
all stresses concentrated on the connector region, producing failure risk at this point of the structures. The veneering ceramic has a greater probability of failure in all two-layered models. The disilicate model can be considered as an alternative for clinical use. The metal-ceramic dentures showed the best distribution on the connector compared to all other models, confirming that they are the gold standard.
Palavras-chave : dental prostheses; crowns; ceramics; finite element analysis.