牙周膜的

The effect of chloromycetin on proliferation of human periodontal ligament cells is same as the effect of normal saline, but chloromycetin causes damage to the ultrastructure of human periodontal ligament cells.

氯霉素对人牙周膜细胞增殖的影响与生理盐水没有区别，但对人牙周膜细胞的超微结构有损伤作用。

Stress distribution of the natural periodontal membrane, bionic periodontal membrane and the bone interface of the three models are calculated out by SuperSAP93, when the same load exerted to the three models. Results The stress change of the inside and outside surface of the natural periodontal membrane and bionic periodontal membrane is in the same tendency.

应用螺旋CT对上颌中切牙标本进行扫描，分别建立仿生种植牙、天然牙和骨性结合种植体模型，对3个模型施加同样的载荷，应用Super SAP93软件，计算出天然牙周膜和仿生牙周膜以及3种模型骨界面上的应力分布。

In this study, we utilized human periodontal ligament to test the hypothesis that cryopreserved human periodontal ligament contains retrievable post-natal stem cells.

我们在实验中利用人牙周膜来证实冷冻保存的人牙周膜中是否存在可收回的成体干细胞。

Results: The cultured PDLSCs and SCAP from single colonies showed typical fibroblast-like cells under light microscope. The colony forming units-fibroblasts of PDLSCs and SCAP were 1 to 23 units /105, 20 to 130 units/105 , respectively.

免疫荧光结果表明，分离培养的第3代牙周膜干细胞中部分细胞Stro-1，Nestin及ALP表达阳性，流式细胞仪结果表明牙周膜干细胞Stro-1表达阳性率为5.6%，Nestin为12.5%， ALP为15.0%。

Objective. 1. There was few researchers who mentioned pericementum which has some effect of resistance to sliding when they studyed the friction of archwire-bracket.

一、研究目的： 1、鉴于目前在测定弓丝与托槽滑动阻力时，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实验模型，分别模拟牙，牙周膜，牙槽骨。

Recombining the plasmid PcDNA3.1-sTNFRⅠ.sTNFRⅠin cell culture supernatant was detected by ELISA and sTNFRⅠblockage of TNFαin pericementum cell by MTT assay.

RT-PCR方法筛选目的基因，并构建质粒；ELISA方法检测牙周膜细胞转染PcDNA3.1-sTNFRⅠ后培养上清中目的基因的表达；MTT检测目的产物是否在牙周膜细胞中有抑制TNF-α的作用。

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。

This study will contribute to a better understanding of mechanism of bone remodeling during tooth movement which may set the basis for clinical work. Methods1. Observe the expression of ATF4 protein in periodontal tissues after orthodontictooth movementA titanium-nickel closed-coil spring was applied to the occlusal surface of the rat maxillary first molar (M1) with a hook and the upper incisors with a ligature wire.

但正畸骨改建与骨发育是两种不同的生理过程，ATF4在正畸牙齿移动牙周组织的表达和分布，在机械力的作用下体外培养的人牙周膜细胞中表达变化的情况，以及在牙周膜细胞向成骨样细胞分化的过程中所起的作用，国内外尚未有报道。

Results:The 3-dimensional finite element models of the minimum distal occlusal structure defect with restoration were created, which included metal crown with exterior anatomic morphology of the mandibular first molar, tooth preparation, filling material and the structure of periodontal membrane.

本研究采用逆向工程技术，通过先进的三维激光扫描技术，三维造型设计技术建立几何模型，将几何数据导入有限元分析软件中，建立了右下颌第一磨牙具有根管和远中面(distal occlusal，DO)最小缺损的全冠修复牙体预备体、充填体、金属冠、牙周膜的三维有限元模型。

Fixed prosthodontics did not change the stress and strain distributions of abutment periodontal ligament but just made the values increased.

固定桥的修复基本没有改变基牙牙周膜的应力和应变分布规律，但使上述值明显增大。

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。