中国人下颌恒切牙根管横切面的形态学研究  

Morphology of Cross-sectioned Root Canal in Chinese Mandibular Permanent Incisors

作　　者：黄定明[1] 郝玉庆[1] 罗世高[1] 贾刘合[1] 周学东[1] 

机构地区：[1]四川大学华西口腔医学院牙体牙髓病研究室口腔生物医学工程教育部重点实验室,成都610041

出　　处：《四川大学学报（医学版）》2006年第6期916-918,共3页Journal of Sichuan University(Medical Sciences)

基　　金：国家十五攻关课题(2004BA720A23);卫生部临床学科重点建设项目(卫[2004-468号])资助

摘　　要：目的观察下颌恒切牙根管横切面的解剖特点。方法选择20颗牙体完整的中国人下颌恒切牙,用硬组织切片机将牙根管横切,在体视显微镜下观察根管的数目、形状和根管峡,测量根管直径,分析根管的解剖特点。结果中国人下颌恒切牙为单根管和双根管,根冠段、根中段及根尖段双根管检出率分别为22.5%,30.0%,15.0%;根管形状可见月牙形和管状形,根冠、根中及根尖段月牙形分别占44.8%,77.0%和44.5%,根中1/3段月牙形显著高于根管其它部位(P<0.05);根管峡在根冠、根中、根尖段分别为62.5%,75.0%和48.7%,存在型、型和型,以型最多,型次之。根管直径唇舌径明显大于近远中径。结论下颌恒切牙根管数目、形状存在多变性,临床根管治疗时应注意绝大部分根管呈长扁的月牙形,存在峡部。Objective To identify morphological features of cross-sectioned root canal in Chinese mandibular permanent incisors. Methods Twenty mandibular permanent incisors were selected in this study. The tooth roots were embedded in resin and transversely sectioned with a low-speed diamond saw. The number of root canal and the morphology and isthmus of the root canal were observed under a stereo-microscope, which included the measure of the canal diameter. Results The double root canal comprised 22. 5%, 30.0%, and 15. 0% in crown third, middle third, and apical third root canals of the mandibular permanent incisors, respectively. The long oval canal comprised 44.8%, 77.0%, and 44.5% in crown third, middle third, and apical third root canals, respectively. The canal isthmus comprised 62.5%, 75.0%, and 48. 7% in crown third, middle third, and apical third root canals, respectively. The diameter of buccal-lingual canal was at least 2 times of the diameter of mesialdistal canal. Conclusion The cross-sectioned root canal morphology in Chinese mandibular permanent incisors varies considerably. But most have long oval and canal isthmus, which imposes a great challenge for root canal therapy.

关 键 词：下颌恒切牙 根管形态 体视显微镜 

分 类 号：R781.05[医药卫生—口腔医学]