摘要
目的:运用显微CT研究非单根管的下颌第一前磨牙根尖0～6 mm区域根管峡部出现的位置和发生率,为提高根管治疗和根尖外科手术的成功率提供解剖学依据。方法:从147颗下颌第一前磨牙中挑选出非单根管的40颗,用显微CT以15μm分辨率、30μm层厚扫描及软件三维重建,观察并记录根尖0～6 mm区域各横截面的峡部形态及分布情况,并对根管系统的解剖形态三维重建后,进行二维、三维图像分析。结果:非单根管的下颌第一前磨牙距根尖0～6 mm区域内根管峡部的发生率(%)由根方向冠方以每1 mm为间距依次为:6%、18.5%、78.6%、80%、79.2%、72.5%。结论:非单根管下颌第一前磨牙根管峡部在距根尖3～6 mm区域高发,其中距根尖3～4 mm区域发生率最高。
Objective：To investigate the incidence and location of the isthmus in mandibular first premolars with 2 or more canals.Methods：40 human mandibular first premolars with 2 or more canals were included in the study.Each tooth was scanned by micro-CTwith resolution of 15 μm and section thickness of 30 μm.The cross-sectional views of the apical 0 ～ 6 mm of the roots were obtained.The number of sections showing isthmus at each level was recorded and compared.Results：In human mandibular first premolars with 2or more canals at each 1 mm level from apical 0～6 mm,the incidence（%） of isthmus was 6.0,18.5,78.6,80,79.2 and 72.5 respectively.Conclusion：Mandibular first premolars have a high incidence of isthmus.In the apical 3 ～ 4 mm area,the isthmus incidence is the highest.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2011年第5期639-642,共4页
Journal of Practical Stomatology
基金
江西省教育厅基金资助(编号:GJJ10352)
关键词
下颌第一前磨牙
根管峡部
发生率
Canal isthmus
Mandibular first premolars
Incidence
