口腔显微镜定位上颌磨牙近中颊根第二根管的效果评价

Evaluation on Identification of Second Mesiobuccal Canals in Maxillary Molars through Oral Microscope

目的:评价口腔显微镜定位上颌磨牙近中颊根第二根管的效果。方法:收集符合条件的离体上颌磨牙80颗,使用CBCT检测MB2根管及分型.分别记录肉眼和口腔显微镜检测MB2的发现率;与CBCT所得结果做比较,对比肉眼直视和显微镜发现MB2的准确性,并分别对假阳性和假阴性的根管类型进行分析。结果:CBCT下MB2发生率51.25%。显微镜对MB2的发现率(42.50%)显著高于肉眼(26.25%),同时显微镜灵敏度高,假阳性率和假阴性率均显著低于肉眼,准确性在不同牙位未见显著差异。然而部分椭圆形根管口的MB2在显微镜下仍难以判断。结论:显微镜的应用可以提高根管定位的精准度,在椭圆形根管上,显微镜和CBCT的联合应用具有较高的临床价值。

Objective:To evaluate the effect of oral microscope on the identification of the second mesiobuccal canal in maxillary molars.Methods:The study sample consisted of 80 extracted maxillary molars,which were subjected to CBCT detection.The teeth were opened under naked eye to identify MB2 canal,and then visualized under oral microscope again.The accuracy with naked eyes and microscope was compared,and the false positive and false negative root canal types were analyzed.Results:CBCT showed 51.25%of MB2 canal in maxillary molars.When compared to naked eye(26.25%),the oral microscope(42.50%)improved the detection rate of MB2 canal.The discovery rate and sensitivity of the microscope were significantly higher than those of the naked eye,while the false positive rate and false negative rate under the microscope were significantly lower than those of the naked eye.There was no significant difference between different teeth.The MB2 of some long oval canals is still difficult to judge under the microscope.Conclusion:The application of microscope can improve the accuracy of root canal positioning.The combined use of microscope and CBCT has a high clinical value on the long oval canals.