摘要
目的对上颌埋伏尖牙三维有限元模型施加不同方向的牵引力,分析比较其牙周组织的应力分布特点,为临床牵引提供理论依据。方法建立埋伏牙及其支持组织的三维实体(CAD)模型,在牙尖处施加不同方向的牵引力,分析比较各种工况下牙周膜的等效应力云图。结果牵引方向与牙体长轴一致时,牙周组织应力分布较为均匀,随着角度的增加,应力集中区域出现在牙尖及面向牵引力侧,最大应力值出现在牙尖处。结论当牵引力方向与牙体长轴一致时有利于其牵引。
Objective ： To analyze the stress of periodontal tissues in different conditions by establishing the three dimen- sional finite element mode 1 of an embedded tooth, and provide experimental reference to the orthodontictraction of embed- ded teeth. Methods： A patient with a canine completely embedded in the maxillary bone was chosen. The three dimensional finite element model of the canine and its surrounding tissues were established by means of the finite element method. On the basis of the stable dental cusp, the canine axis was changed to reach different angles of traction. Equivalent stress clouds of the periodontal membrane of the tooth were observed. Results ： At 0~ , there was a stress concentration area at the apex and cusp of the tooth. As the angle was bigger, there were stress concentration areas at the apex and the sides facing traction forces. Conclusion： When the traction dir.ection is in line with the tooth axis, the embedded tooth moves integrally, and the periodontal stress distribution is homogeneous, which benefits the traction.
出处
《泰山医学院学报》
CAS
2012年第8期578-580,共3页
Journal of Taishan Medical College
关键词
埋伏尖牙
三维有限元
等效应力
embedded canine
finite element method
equivalent stress
