短冠磨牙远中邻牙合缺损髓腔固位冠修复的三维有限元分析  

Three-dimensional finite element analysis of distal proximal occlusal defect of short crown molar restored with endocrown

作　　者：赵苑苑 尚卫华 贺婧艺 李薇鑫 王桃[1] Zhao Yuanyuan;Shang Weihua;He Jingyi;Li Weixin;Wang Tao(Department of Prosthodontics,First Affiliated Hospital of Zhengzhou University,Zhengzhou 450052,Henan Province,China)

机构地区：[1]郑州大学第一附属医院口腔修复科,河南省郑州市450052

出　　处：《中国组织工程研究》2024年第10期1575-1579,共5页Chinese Journal of Tissue Engineering Research

摘　　要：背景:对于牙冠高度正常的牙齿,不同髓腔固位深度及不同修复材料的髓腔固位冠修复对牙体组织应力大小及抗折性有影响,对于短冠磨牙缺损利用髓腔修复的研究多集中在临床观察及体外抗折性实验。目的:建立根管治疗后短冠磨牙髓腔固位冠修复的三维有限元模型,分析不同髓腔固位深度及修复材料的修复体对牙本质等效应力分布及大小的影响。方法:在建立完整短冠下颌第一磨牙模型的基础上,建立不同髓腔固位深度(h=2,3,4 mm)、不同修复材料(氧化锆、二硅酸锂)的髓腔固位冠修复短冠磨牙远中邻牙合缺损的三维有限元模型,采用斜向加载,观察等效应力分布情况,计算牙本质等效应力峰值及近中髓室壁近髓室底等效应力平均值。结果与结论:①等效应力集中部位:完整短冠磨牙及修复后各模型应力主要集中在近中根近中颈部及近中根舌侧颈部,修复后各模型垫底层对应的近中髓室壁近髓室底处均有应力集中区,其中以髓腔固位深度4 mm组应力集中明显;②在相同修复材料下,修复后各模型牙本质等效应力峰值均以髓腔固位深度3 mm组最小,近中髓室壁近髓室底处牙本质等效应力平均值均为髓腔固位深度3 mm组最小;③在相同固位深度下,氧化锆组及二硅酸锂组牙本质等效应力峰值及近中髓室壁近髓室底处牙本质等效应力平均值均相差不大;④结果表明,在此次实验条件下,短冠磨牙缺损采用髓腔固位冠修复时固位深度为3 mm更有利于保护剩余牙体组织,修复材料选择氧化锆或二硅酸锂对牙本质应力影响区别不大。BACKGROUND:For teeth with normal dental crown height,pulp cavity retention crown restoration with different depths of the pulp cavity and different repair materials affects the stress and flexural strength of tooth tissue.For short crown molar defects,the research on pulp cavity repair mainly focuses on clinical observation and in vitro flexural strength experiments.OBJECTIVE:To establish a three-dimensional finite element model for short crown molar restored by the endocrown after root canal treatment to analyze the effects of different pulp cavity retention depths and different repair materials on the distribution and size of dentin equivalent stress. METHODS: Based on establishing the complete model of the short crown mandible first molar, a three-dimensional finite element model was established for repairing the distal adjacent defect of the short crown molar with different pulp cavity retention depths (h=2, 3, 4 mm) and different repair materials (zirconia, lithium disilicate). Under the oblique loading, the equivalent stress distribution was observed. The peak value of dentin equivalent stress and the mean value of equivalent stress near the bottom of the mesial pulp cavity wall were calculated. RESULTS AND CONCLUSION: (1) Equivalent stress concentration areas: The stress of complete short crown molar and restored models mainly concentrated in the mesial root mesial neck and mesial root lingual neck. The stress concentration area was found in the mesial pulp cavity wall corresponding to the bottom layer of restored models, and the stress concentration was obvious in the 4 mm retention depth group. (2) Under the same repair material, the peak value of dentin equivalent stress was the lowest at 3 mm for all models after repair. The average value of equivalent stress near the bottom of the mesial pulp cavity wall was lowest at 3 mm. (3) Under the same retention depth, there was no significant difference between the two materials in the dentin equivalent stress peak and the mean value near the bottom of the mes

关 键 词：短冠磨牙 下颌第一磨牙 髓腔固位冠 固位深度 氧化锆 二硅酸锂 有限元分析 等效应力 

分 类 号：R459.9[医药卫生—治疗学] R318[医药卫生—临床医学] R783.1