›› 2017, Vol. 37 ›› Issue (11): 986-990.

• 基础研究 • 上一篇    下一篇

不同牙本质桩对上颌中切牙切角缺损树脂修复应力的影响

王卫国1,张少锋2,王利民1   

  1. 1. 中国人民解放军第一一七医院
    2. 中国人民解放军第四军医大学口腔医院
  • 收稿日期:2017-05-29 修回日期:2017-06-22 出版日期:2017-11-28 发布日期:2017-11-24
  • 通讯作者: 王利民 E-mail:wlm117@126.com
  • 基金资助:
    反应性抗菌纳米凝胶的合成及其改性口腔复合树脂的基础研究

Effect of different dentin posts on the stress of resin in filling corner defect of maxillary central incisor

  • Received:2017-05-29 Revised:2017-06-22 Online:2017-11-28 Published:2017-11-24

摘要: 目的:探讨不同材料的牙本质桩对树脂充填上颌中切牙切角缺损应力的影响。方法:选择形态、尺寸正常的上颌中切牙,通过逆向工程技术建立上颌中切牙邻面缺损的三维有限元模型, 对其进行桩道辅助设计,其中桩道深2mm,直径1mm;运用三维有限元法分析树脂桩、纤维桩以及氧化锆桩对树脂充填后牙本质桩、树脂粘接界面以及牙体组织粘接界面最大主应力的影响。结果:各实验组最大主应力的分布相似,牙本质桩的最大主应力主要集中于树脂与牙体组织交界处;牙本质桩与树脂粘接界面的最大主应力集中于牙本质桩顶端;牙本质桩与牙体组织的最大主应力集中于树脂与牙体组织交界处。各实验组最大主应力峰值相差较大,其中氧化锆桩组的各项最大主应力峰值均较其余两组大;而纤维桩组与牙体组织粘接界面的最大主应力峰值最小。结论:纤维桩组可以有效增加树脂粘接面积,并降低树脂和粘接界面的最大主应力。

关键词: 切角缺损, 复合树脂, 牙本质桩, 有限元, 应力分析

Abstract: Objective: To investigate the effects of dentin post on the stress of resin filled corner defect of maxillary central incisor. Methods: A three dimensional finite element model of corner defect of maxillary central incisor with different dentin post was established by reverse modeling method. According to the design, the post space was prepared with a height of 2mm and diameter of 1mm. The influence of different dentin post on maximum stress of post, adhesive interface were analyzed by three-dimensional finite element method. Results: The maximum principal stress distribution is similar in each experimental group. The stress of post was mainly concentrated in resin and dentin junction; the stress of post resin interface was concentrated in the top of post; the stress of post tooth interface was concentrated in the resin and dentin junction. The maximum principal stress was different in three experimental groups, the maximum principal stress of zirconia group was larger than the other two groups; and the peak value of maximum principal stress of fiber post is smallest in three groups. Conclusion: The fiber post can effectively increase the resin adhesive area and reduce the maximum principal stress of the resin and bonding interface.

Key words: corner defect, composite resin, dentin post, finite element analysis, stress analysis

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