显微CT与体视显微镜测量根管锥度的体外研究  

In Vitro Study on Taper of Root Canal with Micro-computed tomography(MCT) and Stereomicroscope

作　　者：柳雯[1] 杨柳[1] 许晓芳[1] 李颂[1] 

机构地区：[1]安徽医科大学口腔医学院牙体牙髓科,安徽合肥230032

出　　处：《口腔医学研究》2008年第5期551-553,共3页Journal of Oral Science Research

摘　　要：目的：通过显微CT和体视显微镜测量根管直径,计算下颌第一前磨牙根管的初始锥度,为根管器械和材料的锥度设计、临床选择器械锥度提供参考。方法：首先对23颗13~23岁下颌第一前磨牙（单根管）进行树脂包埋,应用显微CT对包埋体进行断层扫描,并对管径进行测量;再通过制样机对同组样本1 mm等距离磨除,体视显微镜对根管断面管径进行摄片及测量,最后应用数学公式计算各组根管锥度。结果：通过显微CT得到根管近远中向冠、中及尖1/3段锥度分别为：0.05、0.08、0.06;颊舌向分别为：0.11、0.27、0.20。体视镜得到近远中向锥度为：0.07、0.06、0.07;颊舌向为：0.15、0.24、0.17。两种方法所得对应结果经t检验均无显著性差别（P〉0.05）。结论：13~23岁下颌第一前磨牙根管自根尖起为自下而上的扁圆形,其近远中向锥度远远小于颊舌向锥度。根管并非为一连续的锥形,根管锥度在颊舌向的不同部位有明显差异。Objective： To determine the root canal initial taper of mandibular first premolars by using micro - computed tomography（MCT） and stereomicroscope. Methods： 23 extracted, single -root, untreated human root canal of mandibular first premolars （mean age = 18; range 13-23 years） were selected. Firstly, the teeth were embedded in resin. Then the resins were scanned using MCT at a resolution of 10μm. Diameters of cervical, middle, and apical third of the canals were measured . With the help of a sample preparation equipment, the resins were robbed off in a thickness of lmm perpendicular to the long axis of the tooth. For each cross - section, bueco - lingual and mesio - distal diameters of the canal were measured using a stereomicroscope. Finally the taper were calculated and analyzed. Results： With MCT, the average taper of cervical, middle and apical third of these root canals were ： 0.11, 0.27, 0. 20 bueco - lingually and 0.05, 0.08, 0.06 mesio - distally. And with stereomicroseope, the taper were 0.15, 0. 24, 0.17 and 0.07, 0.06, 0.07 respectively. The difference was not observed between two measurement methods on the canal taper by t -test（P 〉 0.05）. Conclusion： The results showed that the ova] cananl is common in these teeth root from up to down. The taper of the eananls in the bueco - lingual oritentation was greater than that in the mesio - distal oritentation at this age. The root canals were not continuous for a cone -shaped, and the canal tapers was significantly different among parts in buceo -lingual direction.

关 键 词：显微CT 体视显微镜 下颌第一前磨牙 根管 锥度 

分 类 号：R781.05[医药卫生—口腔医学]