牙齿的

ABSTRACT Agenesis of one or more teeth constitutes one of the most common developmental anomalies in man.

牙齿的发育不全是一种人类常见的发育异常，先天缺牙是牙齿发育异常的表现之一，可伴随遗传性的综合征出现，也可能是单独的症状以散发病例或家系遗。。。

Before teeth are clean, but over the past six months found that the surface of the teeth and the root edge of black things, be able to pull down, I have very carefully brush your teeth, but still, I ask what this is?

以前的牙齿很干净，但是近半年发现牙齿的面上以及牙根边缘有黑色的东西，能够抠下来的，我已经很仔细的刷牙了，但是还是有，请问这个是什么？

The results showed tooth wear decreased with increasing protein in their diet, and the life-span of the animals increased significantly with improving health condition.

结果表明在枯草高氟期随着蛋白水平的提高显著改善了相应时期发育的牙齿质量，减缓牙齿的磨损速度，从整体上提高了动物的健康水平，有效延长了动物的生存时间。

Absctrct: Objective This study was designed to investigate the stress distribution in the surface of tooth and peridental tissues and the initial displacements of tooth in the maxillary under two orthodental simulating force rectangular archwire with T loop and II class elastic used clinically by the 3-D finite element method so as to clarify the biomechanism of orthodontic tooth movement and component of optimal orthodontic force system.

目的：通过有限元分析法比较两种工况下上颌各牙齿的位移趋势和牙根及牙周支持组织内的应力分布规律，为临床治疗中合理选用矫治力系统以便有效的控制牙齿移动类型提供可靠的理论依据。

The false teeth usually needs good solid Chi to do to prop up, but the part of general imperfection tooth, in addition to on business so collision and cause of drop a tooth, rest regardless is because the tooth week disease or shed off naturally, above 90%s all drops a tooth because the gum atrophies, this has an antinomy, if after cheating, Be roast the porcelain tooth props up of good tooth, gum also because of atrophying but loose how do?

假牙通常需要好的固齿来做支撑，但是一般缺失牙齿的部位，除了因事故碰撞而导致的掉牙，其余无论是由于牙周病或者自然脱落，90％以上都是由于牙龈萎缩而掉牙的，这就有个矛盾，如果做了假牙后，作为烤瓷牙支撑的好牙齿，牙龈也因为萎缩而松脱怎么办？

Roast the porcelain tooth usually needs good solid Chi to do to prop up, but the part of general imperfection tooth, in addition to on business so collision and cause of drop a tooth, rest regardless is because the tooth week disease or shed off naturally, above 90%s all drops a tooth because the gum atrophies, this has an antinomy, if after doing to roast a porcelain tooth, Be roast the porcelain tooth props up of good tooth, gum also because of atrophying but loose how do?

烤瓷牙通常需要好的固齿来做支撑，但是一般缺失牙齿的部位，除了因事故碰撞而导致的掉牙，其余无论是由于牙周病或者自然脱落，90％以上都是由于牙龈萎缩而掉牙的，这就有个矛盾，如果做了烤瓷牙后，作为烤瓷牙支撑的好牙齿，牙龈也因为萎缩而松脱怎么办？

Research on cone/bit speed ratio simulation model of tri-cone bit s;2. In this paper, the kinematics simulation model of tri-cone bit s was established according to the roller cone bit geometry and kinematics.

根据钻头几何学和运动学建立起了随钻运动的三牙轮钻头的计算机运动学仿真模型，该仿真模型既表示出了钻头上各牙齿的形状、大小和在钻头上的分布情况，又可真实反映钻头钻进过程中各牙齿的瞬时位置和相互关系。

However, whether the degree of tooth wear has something to do with tooth microstructure, how specific occlusal factors affect the development of tooth wear, and what kind of relationship exists between tooth wear and bruxism or TMD, all these are not clear yet.

作为磨损发生的主体，牙齿的内部结构与磨损程度之间是否存在一定的关系，牙齿所构成的特定的个体咬合因素及其生物学力学特征会对磨损产生何种影响，口颌系统两大功能紊乱性疾病——磨牙症、TMD与磨损之间存在何种关系，均尚不清楚。

Since teeth problems can lead to serious health conditions, you may want to brush your cat's teeth once a day with a finger tip brush and pet toothpaste.

由於牙齿的问题，可导致严重的健康状况，您可能会想要刷您的猫的牙齿每天一次与指端刷及宠物牙膏。

The development of miniaturized and flexible fiber tips has allowed this device to be used in endodontics. The authors conducted an in vitro study to assess the effects of Er,Cr:YSGG laser irradiation on root canals.

来自维也纳大学牙科学院的Ulrich Schoop博士和他的研究小组分析了60颗人类的牙齿，利用这些牙齿的牙髓部分，小组测试了这种铒，铬：钇-钪-镓（Er， Cr： YSGG）激光照射作用于牙髓的效果。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。