牙

The model of a standard maxillary central incisor restored with cast post and porcelain crown was constructed through three dimensional finite element methods .

运用三维有限元法构建解剖标准前牙桩冠修复体模型，并模拟不同牙合接触形式进行加载以分析剩余牙本质应力。

This minor adjustment is quite easy, as opposed to adjustments made from cuspid to cuspid in the arch form.

这轻微调整很容易，而不是调整从尖牙至尖牙在牙弓形态。

After treatment the changes of dental arch width in first and second premolar region were larger than that of cuspid and first molar regions.

上颌第一、二双尖牙间各自宽度较尖牙间、一磨牙间宽度增加显著。

Methods 40 selected patients treated with fixed appliance were randomly divided into two groups （n=20 each）, the fluoride mouth rinse test group and the placebo control group.The number of decalcified teeth and the severity of enamel decalcification were evaluated and compared after three months and after six months.

从正在接受固定正畸治疗的恒牙列患者中随机选择40例上前牙明确诊断为釉质脱矿的患者，随机分配到试验组和对照组，每组各20例，分别比较3个月后及6个月后牙釉质脱矿程度的变化。

The result unplugs tooth time 5 ～ 42min, average (18.7 ± 5.3)min, without the person that affect badly, without adjacent tooth injury, unplug tooth area does not have the haemorrhage after art, disease of chamfer of have nothing to do with happens, have after art spend oedema, aching, dehisce gently to suffer be restricted.

结果拔牙时间5～42min，平均(18.7±5.3)min，无严重感染者，无邻牙损伤，拔牙区无术后出血，无干槽症发生，术后有轻度水肿、疼痛、张口受限。

Objective: To measure the thickness of enamel and dentin of the first molars.

目的：了解上下颌第一磨牙牙釉质及牙本质的厚度。

Objective To investigate the stress intensity and distribution in the dentine of intact endodontically treated mandibular second premolar under three different restorations.

目的采用3种不同的设计方式修复根管治疗后牙冠完整的下颌第二前磨牙，观察其牙本质的应力大小及分布情况。

Observe the bone formation and depauperation of alveolar bone by X-ray and histological examinations,using those of the extraction sockets by normal healing as control.

于术后2、4、8周分别将犬处死，取拔牙创处牙槽骨标本，行X线和组织学切片检查，观察成骨情况及牙槽骨萎缩情况。

Methods A total of 147 patients with dentin hypersensitivity were randomly divided into two groups, 74 patients with 215 teeth in treatment group were treated with GLUMA desensitizer, and 73 patients with 186 teeth in control group were treated with 750 g/L sodium fluoride.

选取牙齿感觉过敏症病人147例401个牙，随机分为两组：治疗组74例215个牙，用GLUMA系统处理剂脱敏；对照组73例186个牙，用750g/L氟化钠甘油脱敏，观察两组即刻，1个月，3个月后的疗效。

Methods Used the dental desensitizer (Gluma, Single Bond 2, Bisblock) individually on the prepared human bicuspid teeth which were extracted for orthopaedics. Observed the microscopic characteristic of the dentinal surface and cross section with SEM.

常规牙体预备离体正畸牙，涂用脱敏剂（Gluma、Single Bond 2、Bisblock），用扫描电镜观察牙本质表面和剖面的微观特征，与对照组比较。

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。