Title: A 3-Dimensional finite element mechanical analysis on structure defect restoration of the mandibular first molar
Abstract:Objective: To make a mechanical analysis on 3-dimensional finite element models of the mandibular first molar with the maximum distal occlusal structure defect involving pulp chamber wall or not,which...Objective: To make a mechanical analysis on 3-dimensional finite element models of the mandibular first molar with the maximum distal occlusal structure defect involving pulp chamber wall or not,which were restored by filling and crown or post core and crown, and to provide a guideline for planning restoration for such kind of tooth structure defect. Methods: 3-dimensional finite element models of the maximum distal occlusal structure defect involving pulp chamber wall or not were built using advanced 3-dimensional laser scanning and 3-dimensional computer assisted design technique, which adopted the amalgam filling or composite resin filling and then restoration of NiCr metal crown and NiCr alloy post core and crown or Au alloy post core and crown. The Mohr strength theory was applied for comparing the maximum Mohr stress value of dentin and stress concentration areas in two models under different simulating loads. Results: Under the maximum, vertical and inclined loads, the maximum Mohr stress values of dentin of two kinds of restorations were obviously lower than the tensile limit strength of dentin. Under the vertical and inclined loads, the defect involving pulp chamber wall, the maximum Mohr stress values of dentin of post core and crown were lower than that of filling and crown's. Comparing with filling and full crown restoration, the stress concentration area in the models with the post core and crown restoration transfered to parts of root from crown margin, tooth cervix. Under horizontal load, the maximum Mohr stress value of dentin of the two kinds increased remarkably and was close to or greater than that value. Conclusion: Whether or not reserving of pulp chamber wall had an important influence to resistance of teeth after restoration and selecting methods of proper restoration.Read More
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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