摘要
目的研究离体下颌第一磨牙近、远中根的管间峡区出现率及形态，为治疗管间峡区、提高根管治疗成功率提供解剖学依据。方法收集5家省部级医院及1所解剖教研室的离体下颌第一磨牙36颗，经显微CT扫描及计算机三维重建后，以30μm层厚分别获取近、远中根根尖6mm段的横截面图像，记录各截面的根管数目及管间峡区出现情况，并对管间峡区形态进行观察。结果下颌第一磨牙近中根的管间峡区出现率明显高于远中根，距根尖4～6mm水平处管间峡区出现率较高，近中根为49．5％-66．1％，远中根为17．3％～17．8％，卡方检验显示近（远）中根根尖6mm各水平管间峡区出现率的差异具有统计学意义（P〈0．01）。结论下颌第一磨牙近中根管间峡区出现率高，提示临床医师在牙髓外科手术中应有意识地探查管间峡区，降低管间峡区遗漏率，以提高牙髓外科手术的远期疗效。
Objective To investigate the prevalence and configuration of the isthmuses in the apical 6 mm of the mesial and distal roots of Chinese mandibular first molar by means of micro-computed tomography. Methods Thirty-six extracted human mandibular first molars were selected. Specimens were subject to micro-CT and a slice thickness of 30 μm was obtained in the apical 6 mm of the roots examined. The number of sections showing isthmuses at each apical level was recorded. Three-dimensional images of isthmuses of mandibular first molars were reconstructed and observed. Results The mesial roots of human mandibular first molars had a high incidence of isthmus. The isthmus incidence was greatest 4-6 mm from the apex in human mandibular first molar, with prevalence figures of 49. 5%-66. 1% and 17. 3%-17. 8% in mesial and distal roots, respectively. The chi-square test indicated a significant difference in the distribution of isthmuses between the two roots （P 〈 0.01 ）. Conclusions The mesial roots of human mandibular first molars have a high incidence of isthmus, which may have clinical implications especially when surgical endodontics is performed on the mesial roots of mandibular molars.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2009年第1期11-14,共4页
Chinese Journal of Stomatology
基金
卫生部部属（管）医院临床学科重点项目[卫规财函（2007）353号]
2005年广州市医药卫生科技重大项目（2005-ZDa-002）
