牙齿的

Inside the source apply color to develop process in the tooth in formative of, such as four wreath vegetables deposition is in the tooth essence, will make tooth yellow, brown or dark gray, be called four wreaths plain tooths;If containing fluorine in the drinking water is excessive, may also cause fluorine spot tooth, the tooth noodles presents a white chalk color, the palm tree brown spot piece;If the tooth nerve is bad clay-cold, hemoglobin and germ resolve an outcome to combine to also make tooth black.

内源性着色是在牙齿发育过程中形成的，如四环素沉积在牙本质内，就会使得牙齿变成黄色、棕色或暗灰色，称为四环素牙；如果饮用水中含氟过多，也可能导致氟斑牙，牙面呈白粉笔色、棕褐色斑块；如果牙神经坏死后，血色素与细菌分解产物结合也可使牙齿变黑。

In the diagram you can see that the forcer has four sets of teeth and these teeth are spaced in quadrature so that only one set of teeth is aligned with the teeth on the platen at any time.

在图中你可以看到forcer有4套牙和这些牙齿分布在正交，因此只有一套牙齿排列的牙齿在滚筒在任何时间。

Tooth-correct, because of the reason of the Jiao tooth machine, majority all will the engine gum atrophies of linger effect, correct process in or the Jiao tooth uses tooth gold behind, the tooth gold can make the atrophic gum directly absorbed enough nourishment when contains and make atrophic gum reborn thus and shut to match appear because of tooth-correct of difficult see a gum of blind side, avoid bring because of the tooth-correct of the gum atrophy linger effect.

牙齿矫正，由于矫牙器的原因，多数都会引擎牙龈萎缩的后遗症，矫正过程中或矫牙后使用牙齿黄金，牙齿黄金在口含的时候可以让萎缩的牙龈直接吸收到足够营养，从而令萎缩的牙龈再生，闭合因牙齿矫正而出现的难看牙龈缝隙，避免因牙齿矫正带来的牙龈萎缩后遗症。

The strip of material is readily conformable without permanent deformation to a shape of a tooth when the delivery system is placed thereagainst.

当传递体系紧靠牙齿表面时，带状材料能容易地与多个相邻牙齿和牙齿间的空隙相配而不发生永久性形变。

The results were found as following:(1) The damage value increases more significantly with the increase in PVF before 30% PVF, beyond which the increasing trend becomes gradually gentle.(2)Keeping the interphase strength and PVF unchanged, the damage increase with increasing moisture concentration in a nearly linear relation.(3)The results generated from the FCC model with consideration of the interphase debonding are in good agreement with the experimental data, meanwhile, the FCC model is also capable of predicting the critical load for the damaged and the undamaged dental composite subject too the 3-point flexural test.4 A 3D-fmite element analysis has been successfully exploited to examine the mechanical behavior of the restoration-tooth structure under the polymerization shrinkage and water sorption. It was found:(1) The low stiffness of the composite has the effect to limit the displacement occurring in the remaining tooth tissue. For lower interphase, the cuspal flexures are litter higher. The high interphase modulus acts as a \'shielding effect\' for stress transfer.

得到如下结论：(1)相同的吸湿性，在30％PVF(颗粒体积分数：Particle volume fraction，PVF)前增加PVF，层间脱胶损伤值显著增加；此后损伤值的增加趋于平缓；(2)保持层间强度和PVF不变，层间脱胶损伤随吸湿率的增加而接近线性增加；(3)FCC(面心立方：Face-centred cubic，FCC)模型层间脱胶损伤的预测结果和实验数据基本吻合；同时此模型可以用于预测牙齿填充材料三点弯曲实验的临界载荷。4、建立理想牙齿修复结构，利用有限元方法研究了同时考虑聚合收缩和吸湿膨胀耦合作用下的填充修复材料和粘结界面层材料性能对牙齿修复结构的力学行为的影响，得到如下结论：(1)低弹性模量的牙齿填充修复材料能限制天然牙组织的位移，但天然牙组织的位移与粘结界面层的弹性模量无关。

Another 18-year-old university student, usually love He Kele, uncomfortable look at the teeth because of dental, also found that tooth enamel discoloration neck and decalcification, is about to become a dental etching owners.

还有一名18岁大学生，平常爱喝可乐，因牙齿不舒服去看牙医，也发现齿颈部珐琅质变色且脱钙，快要成为牙齿酸蚀一族。何坤炎说，牙齿被酸性食物侵蚀的症状，患者往往在初期没感觉，可能偶尔局部酸痛，但珐琅质会渐渐失去光泽和纹理，最后演变到牙本质和牙髓神经暴露。

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。

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。

Mainly be applicable to and arrange tidy, the lightly mid-degree tooth body of quality integrity changes countenance, whole the tooth light degree arrive mid-degree fluorine spot tooth, whole the tooth light degree four wreaths plain tooths, individual the tooth changes countenance, because the age increases the tooth color that the dentine change causes and delivers Huang and wants to become more white healthy buff tooth, heavy degree four wreaths plain tooth enamels sticks a noodles creation the bleach of front can make and whet in addition to of tooth quantity decrease, the effect is better.

主要适用於排列整齐、质地完整的轻中度牙体变色、全口牙齿轻度到中度氟斑牙、全口牙齿轻度四环素牙、个别牙齿变色、因年龄增长牙质改变引起的牙色发黄，想变得更白的健康浅黄色牙齿、重度四环素牙瓷贴面制作前的漂白可以使磨除的牙齿量减少，效果更佳。

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」。

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。