Mechanical behavior of anterior fixed partial dentures made of different materials subjected to static and dynamic loads / Comportamiento mecánico de las prótesis parciales fijas anteriores fabricadas en diferentes materiales, sometidas a cargas estáticas y dinámicas
Angel, Nathaly; Escobar-Restrepo, Julio César; Latorre-Correa, Federico; Villarraga-Ossa, Junes Abdul.
Rev. Fac. Odontol. Univ. Antioq
; 29(1): 96-130, July-Dec. 2017. tab, graf
Artigo
em Inglês
| LILACS | ID: biblio-957255
ABSTRACT.
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.
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