激光实时全息法测量前磨牙受力研究  

Stress distribution measurement of premolar under loading by laser real-time holographic method

作　　者：任贤云[1] 刘文康[1] 熊秉衡[2] 王正荣[2] 许昭永[3] 王崇真[2] 李黎静[1] 张永安[2] 谢静[1] 何红[1] 

机构地区：[1]昆明医学院附一院口腔科,昆明650032 [2]昆明理工大学激光研究,昆明650051 [3]云南省地震局地震工程,昆明650041

出　　处：《第三军医大学学报》2004年第13期1181-1183,共3页Journal of Third Military Medical University

基　　金：国家自然科学基金资助项目 ( 46 76 40 10 );云南科委应用基础研究基金资助项目 ( 97D0 2 7Q)~~

摘　　要：目的　探讨前磨牙在咀嚼功能作用下的受力状态。方法　按照天然前磨牙尖的大小 ,放大 10倍 ,测试的模型用甲基丙烯甲脂 ( 0号造牙粉 )翻制而成。把测试的模型放在激光实时测量系统上进行测量。结果　在前磨牙牙尖部位及牙颈部位有明显的应力集中。牙尖部位受力较大 ,牙颈部位次之。折裂大多从两牙尖的正中裂开 ,折裂方式与临床观察相吻合。并对此进行了相应的分析。结论　当前磨牙和磨耗成两个牙尖的磨牙时 ,功能咀嚼容易折裂。Objective To introduce the stress distribution of premolar under loading detected by laser real-time holographic method. Methods The experimental model made from methyl-methacrylate (0 resin) and enlarged 10 folds larger of the native premolar teeth was used. Measurement of the experimental model was conducted by laser real-time holographic method. Results The model experiment revealed obvious stress concentration at the top and the neck of the premolar. Most cracks occurred in the central part between the two tops of the tooth, which was concordant with the results of clinical observation. These phenomena were analyzed and some advice on the prevention of cementum exfoliation was given. Conclusion The neck and the top of the premolar are susceptible to crack or fracture under occlusion conditions.

关 键 词：前磨牙 激光实时全息法 干涉条纹 

分 类 号：R322.41[医药卫生—人体解剖和组织胚胎学] R78[医药卫生—基础医学]