牙周膜的

It is well know that the biological basis of Orthodontics is the plasticity of jaw, the strength-proof of cementum and the stability of periodontal ligament internal environment.

口腔正畸学的生物学基础在于颌骨的可塑性、牙骨质的抗压性及牙周膜内环境的稳定性。

Based on this background, maxillary central incisors was prepared as residual roots model, the materials which has the similar physical properties and capabilities as that of the alveolar bone and periodontal membrane respectively were chosen.

基于上述情况，本实验以人离体上中切牙制备实验模型，以力学性能近似的材料模拟牙槽骨、牙周膜和桩冠修复后的上前牙，制作与上前牙口内受力角度相同的夹具及压力头，形成加载测试系统。

On the other hand, extract of cemental matrix was separated and clarified from healthy teeth which were extracted because of orthodontic treatment.

从因正畸需拔除的健康牙体表面获得牙骨质基质提取物，分别观察不同作用时间、不同浓度的牙骨质基质提取物对牙龈成纤维细胞和牙周膜成纤维细胞在牙体表面附着的影响。

After being loaded with horizontal retraction force at various height, displacement and stress distribution of anterior teeth was not well-distributed. Labiolingual displacement of incisors varied from crown lingual tipping to lingual translation and lingual controlling root movement, while canine mainly showed crown lingual tipping. The displacements of teeth increased with the length of hook but their moving tendency remained unchanged. Stress distribution in PDL was in accordance with teeth displacement.

2水平向后牵引力的作用点升高时，上前牙的位移和应力分布趋势各不相同：切牙的唇舌向位移由冠舌向倾斜逐渐变为舌向整体移动和舌向控根移动，尖牙则以冠舌向倾斜位移为主；前牙位移量随牵引力高度增加而增大，但位移趋势较为稳定；牙周膜应力分布与其位移趋势相一致。

Secondly, the self-adaptive models of porcelain, metal base, cement, dental root, gutta percha point, periodontal membrane, cancellous bone and cortical bone were reconstructed based on the post-core crown parameters.

将读取数据导入Pro/E软件中，先将桩核冠进行参数化（参数包括桩核冠的直径、长度、锥度、倒角等等），同时根据桩核冠的参数，分别建立可随桩核冠参数变化而自适应变化的饰瓷、金属基底、粘固剂、牙本质、牙胶尖、牙周膜、松质骨和皮质骨的实体模型。

Objective: to establish a new model to test the resistance to sliding according to the fact that there is few researchers who mention pericementum which has some effect of resistance to sliding when they study the friction of archwire-bracket.

目的：鉴于目前在测定弓丝与托槽阻力时均没有考虑到牙周膜对滑动阻力的影响，因此本实验尝试建立一种新的模型用于滑动阻力的测试。

Methods: a model, in which the youth module proportion of tooth, pericementum and alveolar bone was similar to the somatic data was made taking the advantage of epoxide resin's property.

利用环氧树脂能够模拟不同材料的弹性模量的特性，制作相似于人体实际弹性模量比例的牙、牙周膜和牙槽骨的模型。

Merely decreasing occlusal table width could not result in an obvious stress reduction in PDL, although it could reduce the force at the pontic.

而单纯地减小桥体〓面面积，虽然可以减小桥体所承受的〓力的大小，但对基牙牙周膜应力的降低并不明显。

Objective:To observe the biological effect of bFGF on fibroblasts from peridongal ligament,and evaluate the value of bFGF in clinical pulpal and periodontal therapy.

R781.4A1005-2720-（2010）03-0003-02目的：了解bFGF对人牙周膜成纤维细胞的生物学效应，为bFGF在牙周病中的治疗学研究提供新的实验依据。

Results: Under the compression with a magnitude of 15KP、 30KP, the proliferation of HPDLFs greatly increased, and the percentage of the content of DNA of cells in S phase increased tooP

结果：①。OKP、15KP、30KP、45KP的持续性静压力，加力1小时后，体外培养的人牙周膜成纤维细胞增殖活性的变化为：0～15～30KP，增殖指数以及S期细胞DNA百分比都显著增高(P＜0.05)；45KP压力下，增殖指数及S期细胞DNA百分比明显降低。②。

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。