华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

人工楔状缺损对牙颈部硬组织应力分布的影响

杨文丽1 林雪峰2 朱娟芳1 刘耀鹏3   

  1. 1.郑州大学第一附属医院口腔科, 郑州450052;2.中山大学光华口腔医学院·附属口腔医院修复科, 广州510055;3.香港理工大学土木结构工程学系, 香港
  • 收稿日期:2011-04-25 修回日期:2011-04-25 出版日期:2011-04-20 发布日期:2011-04-20
  • 通讯作者: 林雪峰,Tel:020-83802805
  • 作者简介:杨文丽(1978—),女,河南人,主治医师,硕士

Finite element contact stress analysis of simulating teeth with wedge shaped defects in the cervical region

YANG Wen-li1, LIN Xue-feng2, ZHU Juan-fang1, LIU Yao-peng3   

  1. 1. Dept. of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; 2. Dept. of Prosthodontics, Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou 510055, China; 3. Dept. of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China
  • Received:2011-04-25 Revised:2011-04-25 Online:2011-04-20 Published:2011-04-20
  • Contact: LIN Xue-feng,Tel:020-83802805

摘要:

目的分析楔状缺损患牙颈部硬组织的应力分布。方法在下颌前磨牙沿釉牙本质界建立三角形缺损,设计楔状缺损模型,模拟侧方运动中牙齿的受力情况,对下颌前磨牙颈部硬组织行非线性接触分析。结果斜向载荷下,釉牙本质界缺损的下颌前磨牙缺损区尖端存在明显的拉应力集中。随缺损高度的增加,应力值增大,应力集中程度也增加;应力集中区沿釉牙本质界向方延伸。结论釉牙本质界破坏改变缺损区牙颈部的应力分布。

关键词: 力, 应力, 接触分析, 有限元法

Abstract:

Objective To study the distribution of stress of simulating teeth with wedge shaped defects in the cervical region. Methods The models of anisotropic enamel of the mandibular first premolar and the opposite maxillary first premolar crown were created. A deffect was introduced into the model of mandibular premolar in the buccal cervical region along the enamelo-dentinal junction(DEJ). The stress distribution in the cervical region of the mandibular premolar was investigated considering lateral condition simulating working micromotions. In this case, the stroke was applied to the maxillary first mandibular in a stepping procedure using nonlinear contact analysis. Results The stresses were concentrated in the defect of the enamel and dentin at the DEJ in the condition of lateral loading. As the defect length increased in size, the peak maximum principal stress(MPS) value and the magnitude of the stress field along the DEJ both increased. Conclusion Undermined cervical DEJ had a significant effect on the stress distribution in the buccal cervical region.

Key words: occlusal force, stress, contact analysis, finite element method