牙根

The natural frequency of a successful dental implant is 7.0 kHz ~ 9.0 kHz.

成功骨整合的人工牙根其自然频率数值为7.0 kHz ~9.0 kHz之间。

Comprehensive presurgical examinations, precise diagnosis, and the surgeon's experiences may have influence on the incidence of these risks. In this article, a case of displacement of dental implant into maxillary sinus was presented. We also discussed the possible occurrence reasons and the ways how to resolve and avoid it.

充分的术前检查、诊断与医师的经验及熟练度，往往会影响术后发生并发症的机会，本文将提出一个病例，发生人工牙根位移到右上颚窦内，经转诊到本院来处理，并搜寻相关文献探讨其可能的发生原因、解决方法、预防之道。

The teeth are acrodont that have no dental root.

牙齿外形呈三角形，为端生牙，无牙根？

Was isolated from the diseased leaf of Cynodon hybrid in Red Lotus Lake golf courses in E-zhou. Pathogenicity was tested by inoculating the leaf with mycelium plug of Curvularia sp., the result indicated that Curvularia sp. isolate was the pathogen.

研究结果如下：从鄂州红莲湖高尔夫球场的狗牙根发病植株叶片上分离菌株Curvularia sp。，用菌丝块接种狗牙根叶片进行致病性测定，证实Curvularia sp。

It is concluded that the ZOE with FC is not biocompatible with UB2BOS and the cell death is by apoptosis. Clinically, we suggested that Vitapex is a good choice in primary tooth root canal filling.

作者认为当细胞与传统乳牙根管充填材料作用后，细胞发生死亡之途径可能经由细胞本身之自杀，临床上使用Vitapex作为乳牙根管充填剂是可以接受的。

Objective To evaluate clinical effect of the handling ProTaper Nickel-titanium rotary instruments in preparation of canals of posterior teeth.Methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling ProTaper rotary instruments using step-down technique,and by K files using step-back technique for control.All teeth were obturated with lateral condensation methods.The efficiency of preparation was analyzed with ra-diographs before and after operation.

目的 评价手用ProTaper预备后牙根管的临床效果方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用ProTaper 锥度镍钛旋转器械逐步伸入法预备根管，对照组用K锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗后的X线片，评价后牙根管预备效果。

AIM: To analyze the apoptosis and proliferation of HERS (Hertwig's epithelial root sheath) and to evaluate the roles of HERS cells in the development of cementum.

目的：观察牙根发育中上皮根鞘细胞(Hertwig's epithelial root sheath， HERS)断裂后结局和增殖凋亡相关基因的表达，探讨上皮根鞘在牙根发育特别是牙骨质形成中的可能作用。

The tooth root development is an important part of tooth development. Hertwig's epithelial root sheath takes part in and plays important role in tooth root development.

牙根发育是牙齿发育的重要部分，Hertwig上皮根鞘(Hertwig's epithelial root sheath， HERS)参与牙根发育，并起重要作用。

Objective To observe the crosssectional anatomy of mandibular second molars with two different root kinds and measure the thickness of the minimum root canal wall.

目的：观察并测量两种不同牙根形态的下颌第二磨牙根管横断面最小根管壁厚度。

Results: There were no significant differences between the healing process of frozen ATMC and that of fresh ATMC, and the fibres of regenerated periodontal membrane which maintained the dental root in normal position could be imbedded in the newly formed cementum.

结果：两组自体牙-下颌骨复合组织块移植后愈合过程相似；再生的牙周膜将牙根维持在原来的位置上，牙根尖发生轻微吸收。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。