CAJ | 학술논문

目的用三维有限元方法分析下颌第一磨牙两壁缺损桩核修复后基牙应力,以期为临床提供参考.方法用锥形束CT数据建立下颌第一磨牙三维有限元模型,设计6种缺损模式(A:近中壁和舌壁留存;B:远中壁和颊壁留存;C:远中壁和舌壁留存;D:近中壁和颊壁留存;E:近中壁和远中壁留存;F:颊壁和舌壁留存),分别模拟镍铬合金桩核、金合金桩核、玻璃纤维桩树脂核全瓷冠修复,分别在最大载荷(600 N)、垂直载荷(225 N)、斜向载荷(225 N)和水平载荷(225 N)下,比较缺损模式、修复方式和载荷对基牙von Mises应力分布及最大值的影响.结果缺损模式对相同修复方式相同载荷下基牙应力分布无明显影响.水平载荷下,镍铬合金桩核修复C缺损模式时基牙yon Mises应力最大值最大,为62.81 MPa.随着载荷侧向力的增加,基牙von Mises应力最大值逐渐增加.结论下颌第一磨牙两壁缺损时,金合金桩核、玻璃纤维桩树脂核全瓷冠的修复效果优于镍铬合金桩核,牙壁缺损位置对修复效果无明显影响.
목적 용삼유유한원방법분석하합제일마아량벽결손장핵수복후기아응력,이기위림상제공삼고.방법 용추형속CT수거건립하합제일마아삼유유한원모형,설계6충결손모식(A:근중벽화설벽류존;B:원중벽화협벽류존;C:원중벽화설벽류존;D:근중벽화협벽류존;E:근중벽화원중벽류존;F:협벽화설벽류존),분별모의얼락합금장핵、금합금장핵、파리섬유장수지핵전자관수복,분별재최대재하(600 N)、수직재하(225 N)、사향재하(225 N)화수평재하(225 N)하,비교결손모식、수복방식화재하대기아von Mises응력분포급최대치적영향.결과 결손모식대상동수복방식상동재하하기아응력분포무명현영향.수평재하하,얼락합금장핵수복C결손모식시기아yon Mises응력최대치최대,위62.81 MPa.수착재하측향력적증가,기아von Mises응력최대치축점증가.결론 하합제일마아량벽결손시,금합금장핵、파리섬유장수지핵전자관적수복효과우우얼락합금장핵,아벽결손위치대수복효과무명현영향.
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.