Three-dimensional finite element analysis on half of the structure defect with post core and all-ceramic crown restoration of mandibular first molar
10.3760/cma.j.issn.1002-0098.2015.09.012
- VernacularTitle:下颌第一磨牙两壁缺损桩核修复后基牙应力的三维有限元分析
- Author:
Tao LIU
1
;
Haixia GENG
;
Qiguo RONG
;
Jianzhang LIU
Author Information
1. 济宁医学院附属医院口腔科
- Keywords:
Finite element analysis;
Molar;
Post and core technique;
Crowns
- From:
Chinese Journal of Stomatology
2015;50(9):561-564
- CountryChina
- Language:Chinese
-
Abstract:
Objective To make a mechanical analysis on three-dimensional finite element models of the mandibular first molar defect restored with post core and all-ceramic crown,and to provide a guideline for planning restoration for such kind of tooth structure defect.Methods Cone-beam CT based threedimensional finite element models of post and core restored first mandibular molars were established,with 6 different ferrule designs(the ferrule with only 180 axial wall on different locations).The yon Mises criterion was applied for comparing the maximum von Mises stress value of dentin and stress concentration areas in six models which restored with fiber post or cast NiGr alloy post core or Au alloy post core under the maximum,vertical,inclined and horizontal direct loads.Results The restoration effects in six models were compared,and the maximum yon Mises stress concentration areas were not obviously different.The maximum yon Mises stress value of NiCr alloy post core and crown was 62.81 MPa.Under horizontal load,the maximum von Mises stress value of dentin increased remarkably.Conclusions The location of residual dentin has little influence on the stress distribution,when restored by post core and crown.Au alloy post core and crown or fiber post core and crown are superior to NiCr alloy post core and crown.
