上颌第一磨牙近中舌尖缺损伴隐裂修复设计的有限元分析

发布时间：2018-03-10 13:11

本文选题：上颌第一磨牙缺损伴隐裂　切入点：有限元　出处：《实用口腔医学杂志》2016年01期 　论文类型：期刊论文

【摘要】：目的:研究上颌第一磨牙近中舌尖缺损同时伴有不同深度隐裂纹及不同修复方式修复后其应力分布以及裂纹扩展情况。方法:利用锥形束CT及有限元软件,建立上颌第一磨牙近中舌尖缺损伴缺损断面有不同深度隐裂纹的有限元模型,对模型分别采用不同修复方式进行修复,并模拟在不同咬合力下的受力情况,观察分析裂纹的等效应力值及应力分布、裂纹J积分值、牙本质最大主应力值。结果:采用金属桩加全瓷冠修复3种深度隐裂牙时,裂纹的等效应力值、J积分值、牙本质最大主应力值均最小。裂纹深度增加时牙齿垂直向和斜向受力时的裂纹等效应力值、J积分值、牙本质最大主应力值均明显增大。每一种修复方式中4种受力方向时裂纹等效应力值、J积分值、牙本质最大主应力值均为为200 N、90°200 N、45°600 N、0°200 N。结论:采用弹性模量大的金属桩加全冠修复时,隐裂纹扩展及牙折的可能性较小;隐裂纹越深修复后隐裂纹扩展及牙折的可能性越大;侧向力比垂直向力对裂纹及牙本质的应力变化影响大且易造成裂纹扩展和牙折。
[Abstract]:Objective: to study the stress distribution and crack propagation of maxillary first molars with different depth of hidden cracks and different repair methods. Methods: Cone-beam CT and finite element software were used to study the stress distribution and crack propagation of maxillary first molars. The finite element model of the maxillary first molars with defects at the proximal and middle tongue tip of the maxillary first molar with different depth hidden cracks was established. The models were repaired with different repair methods, and the stress under different occlusal forces was simulated. The equal effect force value and stress distribution of crack, J-integral value of crack, maximum principal stress value of dentin were observed and analyzed. Results: when three kinds of deep cracked teeth were repaired with metal post and all-ceramic crown, the equal effect force value of crack was equal to J integral value. The maximum principal stress of dentin is the smallest. When the depth of crack increases, the equal effect force value of crack and J integral value of tooth under vertical and oblique force are obtained. The maximum principal stress of dentin increased obviously. The maximum principal stress values of dentin are all 200 Ne 90 掳200 N, 45 掳600 N and 0 掳200N.Conclusion: when the metal pile with high elastic modulus is repaired with full crown, the probability of hidden crack propagation and tooth fracture is smaller, the deeper the hidden crack is, the greater the probability of the growth of hidden crack and tooth fracture is. The lateral force ratio has a great influence on the stress change of the crack and dentin, and it is easy to cause crack propagation and tooth fracture.
【作者单位】：郑州大学口腔医学院修复科;郑州市口腔医院种植科;郑州市金水区瑞佳口腔门诊部;
【基金】：河南省卫生厅科技攻关计划项目(编号:201403121)
【分类号】：R783.3

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