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Construction of three-dimensional finite parametic model of mandible first molar all-ceramic crown.

WANG Wei-guo1,ZHANG Shao-feng1,CHEN Jian-jun2,LI Lei3.1.Department of Prosthodontics,School of Stomatology,the Fourth Military Medical University,Shanxi Xi'an 710032,China;2.School of Electronic Mechanical Engineering,Xidian University,shanxi Xi'an,710071,China;3.Unit 65563 of PLA,Liaoning Jinzhou 121100,China.  
Objective:This study is aimed at developing a new method to facilitate the construction of 3D finite parametic model of mandibular first molar all-ceramic crown.Method:The three-dimensional finite element parametic model of mandibular first molar all-ceramic crown were constructed by means of 3DSS-STDC-Ⅱ scanning,digital image transfer,reverse engineering software Geomagic,computer aid design program unigraphics.The assembled models were input into Ansys Workbench software and be meshed and evaluated.Result:A parametic model including veneer occlusal thickness and core occlusal thickness were constructed.The basic model contains 147274 nodes and 100908 elements,and the stress concentrated on cervical of crown,the Maximum equivalent stress is 24.055 Mpa.Conclusion:The method enhances the accuracy,flexibility and efficiency in constructing a 3D finite element model with reverse enging and parameterization of Unigraphics,which provided the platform for the optimun design of all-ceramic crown.
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