牙

This process bleaches the enamel and dentin, the principal mass of a tooth, and brightens the discolored teeth.

这个过程中漂白剂的牙釉质和牙本质的主要质量的牙齿，并照亮了变色牙。

Chondrocytes isolated from the same calf suspended in 30% pluronic were then"painted"onto the articular surface of the scaffold and implanted into subcutaneous pockets on the dorsa of athymic mice.

实验三，在犬双侧下颌第三、四前磨牙和第一磨牙颊侧制备根向深5mm的颊侧骨上袋型牙槽骨缺损动物模型。

The stellate reticu-lum and the dental follicle of the underlying permanent tooth seems to be important for the deciduous root re-sorption. However, primary teeth without a permanent successor eventually exfoliates as well. Our current understanding on the underlying mechanisms is slim.

继承恒牙的牙囊和星网状层似乎在乳牙根的吸收中起着重要作用，而继承恒牙先天性缺失的乳牙根吸收最终仍会发生，其机制目前尚不明了。

When food chip was masticated between dentitions, place food chip in posterior occlusion bilaterally.

在双侧后牙区放置食物片的咬合状态下，负载2kg、4kg、6k、8k咀嚼力时，测量并计算出基牙在近远中向、唇舌向、垂直向的位移、倾斜、扭转量，统计分析不同固位力大小对基牙位移影响的意义。

The study aims to synthesize a new denture base material to complemete the electret of teeth-extracted alveolar bone and stimulate bone growth towards the denture base when masticating and inhibit or rimit the RRR.

本课题研制新型改性义齿基托，在修复牙列缺损或缺失时通过驻极体效应和压电效应，补充患者失牙区局部驻极态的丧失，利用咀嚼运动产生的微电流刺激骨向基托方向定向生长，抵御或缓解牙槽骨的吸收。

Results: Before the fixed bridge was applied, under vertical load, the high-stress region was near around the apical of periodontal ligament with mainly compressive stresses. Under oblique load, the high-stress region was near around the cervical of periodontal ligament with both tensile and compressive stresses. After the fixed prosthodontics, stress and strain distributions were similar with that when the fixed bridge was not applied. But the maximum stress, strain and displacement increased apparently. The stresses in exterior surface of periodontal ligament were larger than that of interior surface; this character of periodontal ligament under vertical load was more obvious than that under oblique load.

结果：固定桥修复前，垂直载荷下，基牙牙周膜的应力以压应力为主，应力集中在根尖；斜向载荷下，基牙牙周膜的应力主要是拉应力和压应力，应力集中在唇、舌颈缘；固定桥修复后，基牙牙周膜的应力和应变分布规律与修复前相似，但最大应力、应变值都明显增大；牙周膜内表面的应力大于牙周膜外表面；垂直载荷时，牙周膜内、外表面的应力差异更为显著。

METHODS: After instrumented with hand protaper Ni-Ti instruments, 28 permanent teeth with single canal were divided evenly into four groups at random. Group A was obturated by LC technique, while group B, C and D were filled by Obtura Ⅱ system with temperature settings at 160℃, 180℃and 200℃.

28个离体单根管恒牙，根管预备后随机均分为4组：A组用传统的泠牙胶侧压充填法进行充填，B、C、D组用Obtura Ⅱ系统将牙胶分别加热至160℃、180℃、200℃进行充填。

PURPOSE: To study the stresses and movement of central incisor with three-dimensional dynamic finite element method, in order to understand and describe the process of occluding.

目的：采用动态有限元方法模拟前牙咬合过程，分析上、下前牙在功能咬合过程中的运动和受力变化规律，为全程描述前牙生理咬合过程提供理论依据。

Cysts form anywhere in the incisive canal located in the palatine bone and behind the alveolar process of the maxillary central incisors, or in the palatal soft tissues that overlies the foramen, called the cyst of the incisive papilla.

无论是在切牙管任何位置的囊肿都位于上颌骨，上颌骨中切牙牙槽突的后方，或者在覆盖于壳顶孔上方的软组织内，这种又被称为龈乳头囊肿

The mobility of the abutments was significantly reduced when they were splinted together. Conclusion: Mini-SGF attachments used in free-end RPDs have no evident adverse effect on periodontal health of the abutment teeth, and the way of splinting the abutments is advantageous to their long-term health and stability.

Mini-SGF附着体在游离端义齿修复中对基牙牙周健康无明显不利影响，基牙的联冠修复形式有利于基牙的健康和稳定。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐