Fatigue survival of bilaminated bioinspired crowns: an in vitro study

Abstract

The aim of this study will be to evaluate the mechanical behavior and fatigue resistance of bioinspired bilayers crowns with modified infrastructures on the vestibular surface (part A) and using different ceramic materials with different elastic modules to compose these crowns (part B). 105 bioinspired crowns will be made according to the following groups: part A - CI (Conventional Infrastructure), SMI (Stratified Modified Infrastructure) and CMI (Cemented Modified Infrastructure), all made in lithium disilicate + porcelain; part B - LD + LEU (Lithium Disilicate + Leucite), LEU + LD (Leucite + Lithium Disilicate), HC + LD (Hybrid Ceramic + Lithium Disilicate) and HC + LEU (Hybrid Ceramic + Leucite). The crowns will be cemented using light-cured resin cement (Variolink Esthetic LC) on full crown preparations made of G10 resin, and then subjected to the stepwise stress fatigue test. For this, three samples from each group will be submitted to the monotonic test in order to determine the parameters for the fatigue test. The crown fracture marks and failure mode will be evaluated and classified by stereomicroscopy and scanning electron microscopy. Finite Element Analysis (FEA) of all groups will also be carried out to assess the distribution of stresses on bioinspired crowns and on dental preparations, according to each one of the parts. (AU)