The three-dimensional finite elements analysis of dentin of maxillary central incisor after being restored by all-ceramic crowns.

Objective:The present study analyzes the distributing situation of the stress of dentin of maxillary central incisor restored by all-ceramic crowns. Method:When simulating the maximum bite force,a loading of 120 N,which forms 30°,40°,45°and 50° with long axis respectively,the study uses the way of three-dimensional finite elements to analyze the distributing situation of the stress of dentin of maxillary central incisor restored by four different all-ceramic crowns materials which are IPS Empress II,In-Cream Alumina,In-Cream Zirconia,Vita Mark II. Result:The distributing situation of the stress of dentin is similar after analyzing by using different all-ceramic crowns materials. But the increase of the loading's angle can make the change of stress greater. Conclusion:When restoring maxillary central incisor by all-ceramic crowns in clinic,we should pay attention to the angle between maxillary and mandibular central incisor,otherwise it will cause damage of dentin.