A higher number of deepened periodontal pockets (infection of the gum around the base of the tooth) had a 53 percent increased risk of heart attack compared to those with the fewest pockets.
牙周袋（牙根周围牙龈感染）多的比牙周袋最少的心脏病风险高53%；
On the base of principle of involute gear and its property, the formation of tooth surface are introduced.
根据渐开线齿轮的原理和渐开线的基本性质，介绍渐开线齿轮齿廓的形成。
The tooth deformation includes the contact deformation, deflection, base deformation and the influence of the body deformation, and the contact stress and the stress distribution are computed too.
轮齿变形包括轮齿接触、挠曲、基础变形和齿轮本体变形的对它影响，还有接触应力和分布。
Secondly, on the base of FEM, mesh stiffness of straight tooth cylindrical gear is calculated, and curve of stiffness is find.
其次，用有限元法，计算了直齿圆柱齿轮传动的啮合刚度，得出了啮合刚度的变化曲线。
High frequency noise of gears is mainly from tooth error and base pitch, and low frequency noise from accumulated errors of tooth spacing.
齿轮高频噪声产生的主要原因是齿形误差和基节偏差；低频噪声产生的主要原因是齿距积累误差。
The high al, Zn base alloy conical gear with straight tooth in squeezing casting can ensure an accuracy of tooth face.
利用挤压铸造技术生产高铝锌基合金直齿圆锥齿轮，齿面精度能够得到保证。
This equation can describe the whole involute transverse tooth profile exactly. It also provides a new theoretical base for the analysis of gear mesh. Kinematics and dynamics.
该方程能准确、真实地描述整个渐开线齿轮端面齿廓，为齿轮啮合、运动学和动力学分析提供了新的理论依据。
This equation can describe the whole involute transverse tooth profile exactly. It also provides a new theoretical base for the analysis of gear mesh. Kinematics and dynamics.
该方程能准确、真实地描述整个渐开线齿轮端面齿廓，为齿轮啮合、运动学和动力学分析提供了新的理论依据。
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