Abstract
Stress analysis was carried out for Class V composite resin restoration models to estimate stresses induced in enamel by polymerization shrinkage of the composite, using a finite element method. For all the models used, tensile stress was concentrated in both incisal side and cervical side marginal enamel near the interface between the composite and enamel. For a butt-jointed model showing good bonding between the composite and dentin, the peak stress in the enamel was found near the cervical side margin. For a model showing a gap between the composite and dentin, on the other hand, tensile stresses in both marginal enamel were higher than those of the model with good bonding, and especially the tendency being marked in the incisal side enamel. Thus the peak stress in the marginal enamel by polymerization shrinkage was reduced by giving bonding between the composite and dentin, using a composite with the elastic modulus being at lower level or as higher as that of enamel, giving a beve! at the cavity margin, and lining the cavity thicker with a material having lower elastic modulus. It suggests that the application of such techniques for Class V composite resin restorations may effectively decrease the occurrence of cracks in the marginal enamel during polymerization of the composite.
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