| 人下颌恒切牙管间峡区解剖的显微CT研究 |
| |
| 引用本文： | 刘成霞,李文,郑庆华,耿宁,孙拓祺,黄定明.人下颌恒切牙管间峡区解剖的显微CT研究[J].华西口腔医学杂志,2010,28(2):177-180. |
| |
| 作者姓名： | 刘成霞 李文 郑庆华 耿宁 孙拓祺 黄定明 |
| |
| 作者单位： | 1.口腔疾病研究国家重点实验室， 四川大学； 2.四川大学华西口腔医院牙体牙髓病科， 四川成都610041 |
| |
| 基金项目： | 国家"十五"科技攻关计划资助项目 |
| |
| 摘 要： | 目的研究人离体下颌恒切牙管间峡区的解剖学特点。方法选择离体下颌恒切牙拍摄近远中向X线片，选出双根管牙33颗，对距根尖6 mm以内的牙根组织进行显微CT扫描。扫描层厚20 μm，每颗牙齿获得扫描截面300个。通过三维重建观察牙根管间峡区的解剖形态。记录距根尖1、2、3、4、5、6 mm处各截面根管数目及管间峡区的出现情况，并测量根管壁的最小厚度。结果所有双根管下颌恒切牙都存在管间峡区，完全峡区占49.7%，部分峡区占4.5%。距根尖6 mm内各截面管间峡区的出现率为10.0%~85.5%，卡方检验显示距根尖1~6 mm处管间峡区出现率的差异有统计学意义（P=0.001）。距根尖3~6 mm处管间峡区出现率较高，以5 mm处最高，为85.5%。距根尖6 mm以内的根管壁最小厚度均小于0.5 mm。结论下颌恒切牙管间峡区的出现率较高，根管壁最小厚度位于峡部，在临床进行根管治疗和牙髓外科手术时应引起重视。
|
| 关 键 词： | 根管解剖 下颌切牙 管间峡区 根管壁厚度 |
| 收稿时间： | 2010-04-25 |
| 修稿时间： | 2010-04-25 |
Anatomic study of canal isthmuses of mandibular permanent incisors by Micro-CT |
| |
| LIU Cheng -xia,LI Wen,ZHENG Qing-hua,GENG Ning,SUN Tuo-qi,HUANG Ding-ming.Anatomic study of canal isthmuses of mandibular permanent incisors by Micro-CT[J].West China Journal of Stomatology,2010,28(2):177-180. |
| |
| Authors: | LIU Cheng -xia LI Wen ZHENG Qing-hua GENG Ning SUN Tuo-qi HUANG Ding-ming |
| |
| Affiliation: | 1. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China; 2. Dept. of Conservative Dentistry and Endodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China |
| |
| Abstract: | Objective To investigate the anatomic feature of the canal isthmus of mandibular permanent incisors by Micro-CT. Methods Thirty-three mandibular permanent incisors with two canals were selected through the radiograph in proximal view. These teeth were then scanned using Micro-CT and reconstructed. The scanning layer thickness was 20 μm. We observed the apical 6 mm of the 33 roots, and 300 sections were gained each tooth, giving a total of 9 900 sections. The numbers of canals at each level in the apical 6 mm were recorded. The numbers of sections showing isthmuses at each level of the root canals were recorded too. Data were analyzed using the Chi-square statistic to test the null hypothesis that location of the sections in each of the apical 6 mm and presence of the isthmus were independent. The minimum root canal wall thickness was measured in each of the apical 6 mm of the roots. Results Isthmuses were found to be present at all levels with prevalence from 10.0% to 85.5%. The Chi-square test indicated a significant difference in the distribution of isthmuses with section (P=0.001). The incidence of isthmuses was higher at the apical 3-6 mm level, and the highest incidence (85.5%) was at 5 mm level. There were many more sections containing complete isthmuses (49.7%) than those containing partial isthmuses (4.5%). The thickness of the minimum root canal was less than 0.5 mm. Conclusion The mandibular incisors have a high incidence of isthmus and are narrow in proximal direction. Debridement of the isthmus is a major challenge during surgical and nonsurgical root canal treatment. |
| |
| Keywords: | canal anatomy mandibular incisor canal isthmus root canal wall thickness |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《华西口腔医学杂志》浏览原始摘要信息 |
|
点击此处可从《华西口腔医学杂志》下载全文 |
|
