下颌第二恒磨牙“C”形根管的研究

The study of C-shaped root canal in mandibular second molars

目的:了解下颌第二恒磨牙"C"形根管的发生情况,为提高根管治疗的治疗效果提供解剖学依据。方法:选取80例离体下颌第二恒磨牙和130例临床上需进行根管治疗的下颌第二恒磨牙,对根管进行探查并结合X线技术,以确定"C"形根管发生情况。结果:80例离体下颌第二恒磨牙中"C"形根管31例,发生率为38.75%。130例临床上需进行根管治疗的下颌第二恒磨牙中"C"形根管为33例,发现率为25.38%。结论:下颌第二恒磨牙根管形态复杂,"C"形根管发生率高,充分了解其根管解剖对提高根管治疗效果有重要意义。

Objective To observe the C - shaped root canal of mandibular second molars so as to provide anatomical evidence for root canal therapy. Methods A total of 210 weU - developed mandibular second molars were examined to make sure the number of the C - shaped root canal. Results C -shaped root canal was found in 31 teeth in vitro （38.75%） and in 33 teeth in vivo （25.38%）. Conclu- sion The root canal systems of mandibular second molars vary considerably in their anatomical configuration, and C - form of root canal presence increases the difficulty of treatment ,so it is very important to master the root canal knowledge for the success of root canal therapy.