上颌第一前磨牙根管峡部的发生率及临床意义  

Incidence and clinical significance of the canal isthmus in maxillary first premolars

作　　者：陈伟[1] 段劲[1] 杨健 

机构地区：[1]浙江省湖州师范学院,330006 [2]江西省口腔医院

出　　处：《现代口腔医学杂志》2008年第3期264-265,共2页Journal of Modern Stomatology

摘　　要：目的研究离体上颌第一前磨牙单根牙根尖1mm～6mm区域根管峡部的发生率和位置的情况。方法收集离体单根上颌第一前磨牙50颗,自根尖开始,片切去除1mm牙根后,用美蓝染色根切面,在显微镜下观察并记录各横截面的根管峡部的类型。在距根尖2、3、4、5、6mm处分别重复以上操作。结果单根的上颌第一前磨牙双根管率是54.00%;根管峡部发生率在距根尖4mm～6mm区较高。结论上颌第一前磨牙的根管峡部发生率在距根尖4mm水平最高。使用手术显微镜可提高对根管峡部的辨认和处理能力。Objective To investigate the incidence and location of the canal isthmus in extracted maxillary first premolars with single root. Methods Fifty maxillary first premolars were included in the study. Starting at the root apex, the transverse section was stained with methylene blue dye after lmm root was resected, and viewed with a surgical operating microscope. Repeat the procedure at 2mm, 3mm, 4mm, 5mmm, 6mm from the apex. The presence and type of canal isthmuses were recorded. Results In the maxillary first premolars of single root, 54% had two canals . The incidence of isthmus was higher in the apical 4 to 6mm level. Conclusion The incidence of an isthmus was highest in the apical 4mm levels. Surgical microscopy enables the clinician to have better visualization and treatment to canal isthmus.

关 键 词：前磨牙 根管峡部 发生率 

分 类 号：R781.33[医药卫生—口腔医学]