牙根管

Understanding of the various and gender-different morphology of the roots and complex root canals of maxillary first premolars, is of great value for the diagnosis and root canal therapy.

上颌第一前磨牙牙根形态多样并有显著性别差异，而且根管形态类型复杂。充分了解其解剖形态，对临床治疗具有重要意义。

The fractures of roots were associated with morphology of roots and incremental lines in dentine.

含2个根管的扁牙根形态较多发生牙根裂。牙本质中的生长线是牙根组织结构上的弱点。

Department of tooth crowns were removed and apical, dedicated root 6mm long, 50 teeth set up Enterococcus faecalis after root canal infection model, 20 teeth were placed in root canals cinnamaldehyde, gallnut decoction, Another 30 infected root canals placed FC, calcium hydroxide paste propylene glycol and normal saline.

标本牙去除牙冠部及根尖部，留取6mm长牙根，50颗牙建立粪肠球菌根管感染模型后，20颗牙根管内分别放置桂皮醛、五倍子水煎剂，另30颗感染根管放置FC、氢氧化钙丙二醇糊剂和生理盐水。

Any root that contains two root canals has the potential to contain an isthmus .

任何含有两个根管的单个牙根内均有可能存在根管峡部。

Objective: To investigate the root and canal morpho lo gy of extracted maxillary second premolars.

目的：观察上颌第二前磨牙牙根和根管形态，为根管治疗提供解剖学资料。

Objective: To investigate the root canal configuration and the incidence and location of the isthmus in extracted maxillary second premolar with single root.

目的：研究离体单根的上颌第二前磨牙根尖1—6mm处根管形态及根管峡部的发生率和位置的情况。

Methods Nineteen bone impacted and unerupted teeth in 18 cases selected by orthopantomograph were scanned by 3DX-CT with 1.0 mm slice thickness. Images obtained by 3DX-CT (horizontally, sagittally, coronally) were analyzed after multi-plane reconstruction and 3D reconstruction including the angle of the bone axis impacted and unerupted teeth; maximum radius of the coronal teeth; distances between the tooth and the cortical bone around; distances to the neighboring tooth roots and nerve forum canal; the thickness of the bone tissue, etc.

对经曲面断层片筛选出的18例19枚埋伏牙进行牙科三维CT检查，扫描层厚1.0mm，重建后进行图像三维断面显示（包括水平位，矢状位，冠状位），对牙位图像进行分析及测量（包括埋伏牙牙长轴的角度，牙根弯曲度，牙冠的最大径，与骨皮质的距离，与邻牙根、神经孔／管的距离；骨质的厚度、高度等）。

This report presents 2 cases of inadvertent injection of sodium hypochlorite into the periradicular tissue because of apical constriction destruction and canal perforation. Acute severe pain, gingival swelling, cellulites, and even parathesis over the circumscribed region of the upper lip were noted.

本病例报告是两例有关根管治疗过程中，因治疗过程不愼使根尖孔破坏与穿孔，并将根管冲洗溶液次氯酸钠挤压至牙根周围组织中，造成急性疼痛、牙龈肿胀、蜂窝组织炎，甚至有局部性的嘴唇麻痹现象等剧烈组织反应。

Methods: 60 freshly extracted , single-rooted premolars were randomly divided into two experimental groups (cinnamic aldehyde, gallnut decoction) and four control group (FC group, calcium hydroxide mixed with propylene glycol group, negative the control group and positive control group),.

标本牙去除牙冠部及根尖部，留取6mm长牙根，50颗牙建立粪肠球菌根管感染模型后，20颗牙根管内分别放置桂皮醛、五倍子水煎剂，另30颗感染根管放置FC、氢氧化钙丙二醇糊剂和生理盐水。

An isthmus is a narrow, ribbon-shaped, communication between two root canals that contains pulp or pupally derived tissue.

根管峡部是指同一牙根内两根管之间含有牙髓或牙髓生成组织的一种窄形、带状结构。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。