牙长轴

不同材料套筒冠基牙长轴位移及应力分析

Analysis of the Movement of Long Axis and the Distribution of Principal Stress in Abutment Tooth Retained by Conical Telescope

小型猪咀嚼肌及牙长轴方向的研究

Study on masticatory muscles and tooth long axis of miniature pigs

人类牙齿的釉质表面有平行排列的与牙长轴垂直的浅凹线纹和不规则的圆形小凹。

The enamel surface of human teeth have parallel dimples , with are vertical to the tooth prolate axis , and irregular round concaves .

目的探讨小型猪咀嚼肌及牙长轴方向与人类的相似性，以利其在口腔生物力学研究中的应用。

Objective the similarities of masticatory muscles and teeth orientations between miniature pigs and human beings were studied in order to evaluate the use of miniature pigs in oral biomechanics research .

结论：固位钉的方向与牙体长轴一致时，剪切力较大，旋转力矩最小有利固位。

Conclusions : If the direction of the retention pin is paralled to the teeth axis , the stronger the shearing force , the less the moment of a rotation force .

建立有限元模型：用蜡块将牙齿固定，使扫描尽可能与牙体长轴垂直，扫描至牙颈部。

Establishment of finite element model : The tooth was fixed with paraffin block . The scanning ray was vertical with long axis of tooth , and the scanning was done till dental cervix .

结果41例中37例见牙体长轴排列不整齐，倾斜、旋转、重叠，牙齿长轴间距离不等，其中25例共有36颗埋伏牙。

Results Thirty-seven of the 41 patients showed malalignment , tilt , rotation , overlap of the teeth and the different space between the longitudinal axes of the teeth . Twenty-five cases of them have shown 36 buried teeth in all .

结论：从力学角度提示：桩冠修复时应尽量减小牙合力与牙体长轴的角度，在下颌做前伸运动时对颌牙应避免与修复体早接触。

Conclusion : Such mechanical analysis results suggest that the angle of the occlusal force and long axis of body should be diminished to the limit , the prosthesis should be avoided from the contact with teeth under the protrusive movement .

随着牙合力方向与牙体长轴所成角度的增加，牙折的可能性增大。

As the angle between occlusal force and teeth long axis increases , the possibility of teeth fracture will increase .