Residual shrinkage stress distributions in molars after composite restoration.

摘要: Objective. Experimental measurements on various restoration configurations have shown that restored teeth deform under the influence of polymerization shrinkage, but actual residual stresses could not be determined. The purpose this study was to calculate and validate shrinkage associated with reported tooth deformations. Methods. Three different were applied in a finite element model molar. composite properties based experimentally determined behavior during polymerization. occlusal deformation pattern stress states tooth, restoration, tooth-restoration interface calculated using post-gel concept. Reported strain gauge patterns used for validation. Results. depended configuration size restorations. tooth's resistance against diminished loss dental hard tissue. Larger restorations resulted lower levels interface, increased tooth. maximum values found decisively different. Significance. validated indicated cannot or alone, has approached as distributed depends location geometry, constraints, procedures. Tooth indicative rather than across interface.