牙齿大小

中国第四纪人类牙齿大小的演化及其意义

The evolution of tooth size of Quaternary humans in China

而颚间牙齿大小的差异，可能会影响矫正治疗最后的结果和咬合的稳定性。

Intermaxillary tooth size discrepancy can affect the final result of orthodontic treatment and its stability .

在此基础上求出了17个以牙齿大小推算颅骨大小的回归方程。

On the basis of the significant coeffi-cients 17 regression formulae of estimating cranial size from the tooth size were listed .

然而，我们的牙齿大小从古至今没什么变化，所以变小的嘴巴没有足够的空间容纳它们。

Yet because our teeth are roughly the same size as they have long been , our shrinking jaws don 't leave enough room for them in our mouths .

通过进一步的检测，研究者们发现这个名叫“主的耐心”的圣象拥有8颗人类的牙齿，通过大小判定这些牙齿很可能是从一个健康成人那里移植过来的。

Upon closer examination , the researchers found that the Lord of Patience was fully equipped with eight human teeth , and judging by the size they were probably removed from a healthy adult .

该仿真模型可真实反映牙轮钻头钻进过程中牙轮上各牙齿的形状、大小，钻头上各牙齿的布置及钻头钻进过程中各牙齿间的相互位置关系。

Based on the geometry and kinematics of roller cone bits , the computer simulation model of roller cone bits is set-up which can actually reflect the shapes , sizes and the relative positions of the teeth on bit during the bit drilling process .