Unlike bleaches, they don't change the color of teeth.
不同于漂白剂，它们并不改变颜色的牙齿。
The paper presents the research into the stress state of roller teeth using FEM (finite element method). The results show that different structure parameter causes a change in roll stress.
采用有限单元法对轧辊辊齿的应力状态进行了研究，得出了不同结构参数对轧辊应力变化的影响。
Based on the thermal elastic mechanics, the influence of temperature change on the normal backlash was analyzed, and the deviation of teeth width was calculated.
本文运用热弹性力学原理，分析了温度变化对啮合齿轮侧隙的影响以及对齿厚偏差选择的影响。
The ratios of these element forms change with climate and local geology. Like tree rings, human teeth record this signature year by year and can be used to narrow down a person's native region.
这些元素因为气候和当地地理而改变的比率像树年轮一样，人类的牙齿同样年复一年的记录着这些特征，这常常可以用来限定一个人的出生地。
Objective To explore the formation rules of marks on copied the sloping square-shaped teeth keys, the shading process of copied marks and change factors of copied keys.
目的探索方形坡状齿钥匙增配痕迹形成规律、增配痕迹随开启次数的渐变过程以及增配痕迹的变化因素。
Methods: the limulus lysate test of chromogenic substrate method was applied to detect the change of endotoxin content in 33 teeth with periodontitis before and after root canal treatment.
方法：采用产色基质法鲎试验对33例根尖周炎治疗前后根管内的内毒素含量变化进行了检测。
Good at various deformities and treatment, change the rows of teeth to improve appearance and face.
擅长各种牙列畸形的矫治，使牙齿整齐美观及改善面容；
This paper introduces a set of practical calculation method of change differential gears, which can conveniently calculate the optimum teeth number of change gears with high accuracy.
本文介绍了一套比较实用的挂轮计算方法，可方便地计算出高精度挂轮的优化齿数。
Using the methods, the calculation of optimized number of teeth of a high_precision change spur_gear can be rapidly made.
用此方法，可便捷地计算高精度挂轮的优化齿数。
Objective To compare the esthetic effect and the change of periodontal tissue in restoring anterior teeth with porcelain fused to metal crown and all ceramic crown.
四环素变色牙、釉质发育不全、死髓变色牙、牙体间隙及牙体缺损缺失等因素均能够影响牙体或牙列的功用和美观，后者在前牙区尤其突出。
Objective To compare the esthetic effect and the change of periodontal tissue in restoring anterior teeth with porcelain fused to metal crown and all ceramic crown.
四环素变色牙、釉质发育不全、死髓变色牙、牙体间隙及牙体缺损缺失等因素均能够影响牙体或牙列的功用和美观，后者在前牙区尤其突出。
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