牙科手术显微镜用于探查上颌第一恒磨牙近颊根第二根管口的诊断性试验

目的评价牙科手术显微镜（DOM）用于探查上颌第一恒磨牙近颊根第二根管（MB2）根管口的诊断价值。方法选择120个离体上颌第一恒磨牙为研究样本，采用交叉试验设计模式，将牙齿开髓后通过肉眼和手术显微镜分别进行MB2根管口的探查，探查完毕后将标本制成透明牙。以透明牙为金标准，以肉眼探查结果为对照，评价DOM的诊断价值。结果DOM探查的敏感性和准确度分别为0.78和0.76，优于肉眼探查的0.61和0.65（P<0.05）。结论使用手术显微镜能够提高MB2的发现率。

Diagnostic Test Study of Dental Operating Microscope Used for Locating the Second Mesiobuccal Canal Orifice in Maxillary First Molars

Objective To estimate the diagnostic potential of the dental operating microscope used for locating the second mesiobuccal canal(MB2) orifice in maxillary first molars.Methods 120 extracted maxillary first molars were used,all the access cavities were prepared and fixed on the dental study model.MB2 orifices were examined with naked eye and under a dental operating microscope(DOM).The examination was repeated by another dentist with the same methods.Then Indian ink was injected into the pulp chamber and all the teeth were treated to be transparent to determine if it had a real MB2.Results The sensitivity and accuracy of the DOM group were 0.78 and 0.76,higher than 0.61 and 0.65 of the naked eye group(P<0.05).The correspondency of Kappa index between observers by naked eye and DOM was 0.701 and 0.819,respectively.Conclusion The use of DOM can increase the detection rate of MB2.