【作者】 杨俊； 范兵；

【Author】 YANG Jun,FAN Bing(Key Lab for Oral Biomedical Engineering of Ministry of Education,Endodontic Center,School & Hospital of Stomatology,Wuhan University,Wuhan,China)

【机构】 武汉大学口腔医学院高新技术中心；

【摘要】 目的:通过显微CT扫描,研究下颌第一前磨牙C形牙根根面沟及其内部根管系统横断面的解剖特点。方法:收集358颗牙根发育完全的下颌第一前磨牙,筛选出有根面沟的下颌第一前磨牙,使用显微CT扫描;用图像分析软件对根面沟及其横断面根管形态的特点进行观测。结果:根面沟的发生率为24%;根面沟多位于牙根的近中舌侧,沟的平均长度为8.77mm,平均深度1.44mm;C形牙根横断面根管系统的形态从釉牙骨质界到根尖可发生显著变化,根管各段之间形态存在差异(P<0.005)。结论:中国人下颌第一前磨牙牙根近中舌侧根面沟的发生率高,根面沟的存在导致其内部根管系统发生相应的变化。更多还原

【Abstract】 OBJECTIVE:To investigate(a) anatomical structure of grooves and morphological features of root canal system in mandibular first premolars with C-shaped root using the micro-computed tomography(μCT) in vitro.METHODS:358 mandibular first premolars were collected,in which the teeth with deep groove on root were selected and scanned using the micro-computed tomography;The morphology of grooves and root canals were evaluated with image analysis software.RESULTS:The prevalence of groove was 24%,most of which were located on mesial lingual surface of the root;The mean length and depth of groove was 8.77mm and 1.44mm respectively;The root canal system in C-shaped root could be seen to vary in shape at different levels considerably(P<0.005).CONCLUSIONS:The current study demonstrates that the prevalence of groove on root of mandibular first premolar is high,which may cause the relevant morphological variety of root canal system.更多还原