上颌第二乳磨牙MB2根管的临床发现率

摘要

目的:研究上颌第二乳磨牙近中颊根第二根管(MB2)的临床发现率.方法:选择上颌第二乳磨牙患牙髓炎或根尖周炎的患儿73名共75个患牙,手术前后拍摄X线片.揭髓顶后用#10 K锉沿近中颊根根管口与腭根根管口之间的发育裂隙(沟)或暗线探查并寻找MB2,计算MB2发现率;记录近颊根根管(MB)与MB2的工作长度,并对数据进行统计分析.结果:75个上颌第二乳磨牙中有58个(77.33％)存在MB2,其中3个牙(5.17％)于髓室底水平有独立的MB2根管口.MB2发现率性别间无显著性差异(χ2=0.89,P>0.05).MB工作长度大于MB2工作长度(t=9.67,P<0.05).结论:上颌第二乳磨牙中MB2有较高的发现率,临床治疗时应仔细探查.%AIM:To study the clinical incidence of the second mesiobuccal(MB2) root canal of maxillary sec-ond primary molars. METHODS:75maxillary second molars with pulpitis or apical periodontitis in 73 children(34 male,39 female)were included. The teeth were examined by X-ray films before operating. After opening the pulp chamber, the fis-sure or grooves between the mesiobuccal and palatal canal were detected with #10 files to find MB2. Then, the therapy of MB2 was completed using root canal apex locator. The incidence of MB2 was calculate through the postoperative X-ray films. RESULTS:MB2 canal was found in 58 out of the 75 maxillary second primary molars(77. 33％). There was no sig-nificant defferenc of MB2 canal between gender(χ2 =0. 89,P>0. 05). The working length of MB was greater than that of MB2. CONCLUSION:There is a high incidence of the second mesiobuccal root canal of maxillary second primary molars.