牙齿

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。。。

1Tooth wear was a common phenomena.The degree of tooth wear increased with age.2The tooth wear scores in men were higher than those in women.3Tooth wear was related with biting habit and subfunctional movement.

①牙齿磨损在成年人群中相当常见，磨损程度随年龄的增长呈上升趋势；②男性牙齿磨损发生率高于女性；③牙齿磨损与个人的饮食习惯、副功能运动等有一定联系。

Root canal treatment or endodontics is used to save the tooth when the dental pulp (blood vessels and nerve in the centre of the tooth) dies and the tooth becomes infected.

根管治疗或牙髓是用来保存牙齿时，牙髓（血管和神经在该中心的牙齿）去世和牙齿，成为感染。

Because the gum atrophies part only a tooth seldom of, usually is all one, now that have a tooth because of atrophying but shed off, periphery of tooth's appearing an atrophic risk is very big, if is a sustaining good tooth loose, will make the whole row roasted a porcelain tooth to shed off together.

因为牙龈萎缩部分很少只有一个牙齿的，通常都是一片，既然有个牙齿因萎缩而脱落，周边的牙齿出现萎缩的危险性是非常大的，如果作为支撑的好牙松脱，就会导致整排烤瓷牙一起脱落。

The coil spring were kept constant and recorded for 0hr, 1 hr, 2 hrs, 4 hrs, 8 hrs, 12hrs, ldays, 3days or 7days. Upon completion of experiments, the maxillae were removed. The specimens were fixed in 4% paraformaldehyde in 0.1 M phosphate buffer for 24 hrs and decalcified in 10% ethylene diamine tetraacetic acid at room temperature for 5 wks.

本研究通过建立正畸大鼠牙齿移动动物模型和体外细胞培养，结合细胞力学试验方法和分子生物学测试技术，拟从组织、细胞水平以及分子生物学角度探讨ATF4在正畸牙齿移动过程中对牙周组织改建的影响及作用机制，进一步为正畸牙齿移动提供理论和实践依据。

So you see tooth not the orderliness unexpectedly has so many banes, hope all tooths that the kids' parents can pay attention to a kid, periodical check, give kid an orderliness beauty, healthy of tooth, also gave kid self-confident in the meantime.

所以您看牙齿不整齐竟然有这么多的危害，希望所有孩子的家长都能够关注孩子的牙齿，定期检查，给孩子一副整齐美丽，健康的牙齿，同时也给了孩子自信。

Tooth color or appearance are poor, four wreaths plain tooths, tooth defection and damage or external injury break of tooth, can also pass to roast a porcelain tooth to get a perfect repair.

牙齿颜色或形态不佳、四环素牙、牙齿缺损或外伤折断的牙齿，也可以通过烤瓷牙得到完美的修复。

One week later, each tooth was irradiated by Nd﹕YAG laser with three parameters. And the one of the four dogs was killed immediately and the teeth were extracted, immediately transected in lased areas and fixed in 10% formaldehyde solution.

一周后对不同的牙位以三种参数的激光照射牙齿，并在即刻、3 d、7 d、30 d四个时间段将犬处死，立刻取下所有的实验牙，并从激光照射区横断牙齿，分别将牙齿的冠根置入不同的固定液中。

The major concern during laser irradiation of teeth is the high potential of tissue overheating resulting high temperatures that can spread in toward the dentin,causing irreversible damage to cells presented in the pulp chamber and leading to cell death,so the related laser irradiation parameters should be controlled strictly.

激光辐照牙齿时所产生的温升容易引起牙髓细胞不可逆的损伤，导致牙髓细胞坏死，因此必须对相关的激光参数加以控制。建立了激光与牙齿相互作用的热传输模型，利用Crank-N icolson有限差分法数值模拟了不同Nd∶YAG激光参数照射下牙齿表面及内部的温度场的分布。

Second, respondents know the children under 5 years old can accept "Children Dental Prevention Program" free, children's dentist will offer the relevant information of "Children Dental Prevention Program" voluntarily, children received self-paid fluoride application can influence respondents ' children accept "Children Dental Prevention Program".

二、受访者知道5岁以下儿童可以免费接受「儿童牙齿预防保健服务」、儿童的牙医师会主动提供「儿童牙齿预防保健服务」相关资讯、儿童曾自费涂氟会影响受访者之儿童接受「儿童牙齿预防保健服务」。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。