矫正扭转牙辅弓的力学性能研究  

The Mechanical Study of the Auxiliary Arch Used to Correct rotated Teeth:Ⅰ.The Design of the Auxiliary Arch

作　　者：许衍[1] 曾科 马晓晴 

机构地区：[1]南京医科大学口腔医学研究所,南京医科大学附属口腔医院正畸科,江苏南京210029 [2]爱满地口腔门诊部 [3]瑞尔齿科,上海200120

出　　处：《广东牙病防治》2009年第1期13-16,共4页Journal of Dental Prevention and Treatment

摘　　要：目的研究矫正扭转牙辅弓的力学性能。方法用0.36mm的澳丝弯制各种预设角度、加力臂长度为12mm和17mm、螺圈数为1圈和2圈的辅弓,测量所对应的矫治力值,并绘制直线回归方程。结果螺圈数为1圈、加力臂长度为12mm辅弓产生的力值(g)Y对初始角度(°)X的直线回归方程为:Y=25.139+1.21X;螺圈数为1圈、加力臂长度为17mm辅弓的直线回归方程为:Y=32.163+0.727X;螺圈数为2圈、加力臂长度为12mm辅弓的直线回归方程为:Y=30.999+0.715X;螺圈数为2圈、加力臂长度为17mm辅弓的直线回归方程为:Y=33.119+0.408X。增加加力臂长度及螺圈数均影响弓丝的施力状态,减小辅弓的负荷绕曲率。结论0.036mm澳丝弯制的螺圈数为1圈、加力臂长度为12mm及17mm的辅弓,或螺圈数为2圈、加力臂长度为12mm及17mm的辅弓在其弹性限度内都能提供临床所需的力值。不同长度、螺圈数的辅弓其负荷绕曲率不同,且初始力值随着固位体与力臂角度变化关系也不同。Objective To design the auxiliary arch used to correct the rotated teeth by testing the mechanical properties. Methods The forces of the auxiliary arch with different angle, arm length and circles were tested. Results The linear regression formula of one-circle/12mm-arm-length auxiliary arch is Y（g） = 25.139 ＋ 1.21X（°） ; one-circle/17mm-arm-length auxiliary arch is Y（g） =32.1631＋0.727X（°） ; two-circle/12mm-arm-length auxiliary arch is Y（g） = 30.999 ＋ 0.715X（°） and two-circle/17mm-arm-length auxiliary arch is Y（g） = 33.119＋0.408X（°）. The increase of arm length and circles influenced the force, and reduced the loading deflection rate. Conclusion The auxiliary arch bending with 0.036mm Australian wire could provide suitable force for clinical use. The load-deflection-rate changes with different arm length and different number of circles of the auxiliary arch. The beginning force varies with the relation- ship between the retention part and the forcing arm.

关 键 词：辅弓 扭转牙 力学性能 

分 类 号：R783.5[医药卫生—口腔医学]