A higher number of deepened periodontal pockets (infection of the gum around the baseof 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%;
2
On the baseof 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。
3
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.