Abstract:

BACKGROUND: Clinical research about the post inlay mainly focuses on inlay materials and pile length, while the research on the morphology of the occlusal surface is rare.
OBJECTIVE: To analyze the stress magnitude and distribution of remaining dentin and parodontium in mandibular first molar short crown restored with post inlay using three-dimensional finite element method. And then to discuss the rational core design of occlusal surface of mandibular first molar short crown.
METHODS: The three-dimensional element models of mandibular first molar short crown restored with post inlay were created by CT scanning, Mimics software and Unigraphics NX6.0 software. Different cuspal inclination of post was used in the modeling, including post inlay, crown, root, periodontal ligament and alveolar bone. A load of 240 N was applied to the occlusal surface in order to analyze the maximum principal stress, Von-mises peak stress and distribution of remaining dentin in mandibular first molar short crown restored with post inlay.
RESULTS AND CONCLUSION: The maximum stress on remaining dentin and parodontium increased markedly with the increasing of different cuspal inclination. Cuspal inclination has influence on magnitude and distribution of stress on remaining dentin and parodontium in mandibular first molar short crown restored with post inlay.