摘要
目的研究Carrière Distalizer矫治器(CD矫治器)5种加载力值下上颌尖牙和磨牙应力分布及位移。方法构建CD矫治器作用模式的三维有限元模型,设载荷方向为平面下20°,代表以下颌第一磨牙做Ⅱ类牵引之起点向前上方止于尖牙。设定加载力值分别为50、100、150、200、250g,分析5种力值下,上颌尖牙和磨牙应力分布及位移的差异。结果应力和位移均与载荷力值成正比。但5种力值中,200g力值下,尖牙和磨牙的应力和位移增加不多;250g力值下,无论尖牙还是磨牙,其牙颈部的应力分布和位移明显非等差地高于其他4种载荷力值下的应力分布和位移。结论不同载荷力值作用于上颌尖牙和磨牙时,其应力和位移的分布规律大致一致,且应力和位移的大小基本随载力值的递增而增加。150g与200g载荷力值下的应力和位移趋同,提示其可能是CD矫治器较理想的牵引力。
Objective To simulate the effects of Carriere Distalizer on the maxillary group teeth through finite-element analysis and to analyze their stress distributions and displacements when five different loading forces in magnitude are applied. Methods To build a three - dimensional finite-element model of Carriere Distalizer on which direction of force is set to 20°below the occlusion surface which represents the Class Ⅱ elastic traction starting from the first molar of mandibular to the canine of maxilla. Forces of 50 grams, 100 grams, 150 grams, 200 grams and 250 grams in magnitude were respectively applied to analyze the stress distributions and displacements of maxillary canines and molars under different forces. Results Stress and displacement were proportional to the force applied. However, under the 200 grams of force, the stress and displacement of canine and molars increased slightly. Under the 250 grams of force, the stress distribution and displacement around the neck of both canine and molar was clearly but unevenly higher in magnitude than those under the other four forces. Conclusion When forces different in magnitude are applied on canines and molars, the stress distributions and displacements are generally proportional to the forces applied. However, the stress distributions and displacements under 150 and 200 grams are similar, indicating that they would be the ideal forces for Carriere Distalizer.
出处
《广东牙病防治》
2010年第2期71-74,共4页
Journal of Dental Prevention and Treatment
基金
广东省医学科学技术研究基金(A2008103)
