Objective:To compare the effects on the size and distribution of stress of different adhesives on post-core crown restored posterior stump of teeth dentin

to discover reasonable post-crown adhesive material of posterior stump of teeth post-core crown

by three dimensional finite element analyses. Methods:Establish three dimensional finite element models of maxillary first molar post-core crown by CT scanning

Mimics and Abaqus software

which include post core

crown

tooth root

pericementum

alveolar bone and adhesive material. Divide above models into experimental and control group according to the relative adhesive material. Choose three load spots on the occlusal surface of this model

and exert 80N loading strength on each. Then calculate the peak value and distribution mode of Von mises stress

max-principle stress and shear stress. Results:In the different adhesive material experimental groups

the peak value of the stress on the dentin of the composite resin group was lower than those in zinc phosphate groups. Conclusion:On the condition of this experiment

different adhesives have different effects on the peak value and distribution of the stress on the post-core crown restored posterior stump of teeth dentin.