上颌第二乳磨牙根管数目的临床研究

Clinical study of root canal numbers in maxillary second primary molars

目的观察临床治疗中上颌第二乳磨牙根管数目。方法选取需行上颌第二乳磨牙根管治疗的3~8岁患儿204例,共216颗患牙。常规方法开髓、制备开髓洞型,使髓室底完全暴露,用小号锉结合17%乙二胺四乙酸(ethylene diamine tetraacetic acid,EDTA)溶液探查各根管口的位置,确定并记录根管数目,根管预备完成后采用碘仿氧化锌糊剂进行根管充填。结果 216颗上颌第二乳磨牙中,122颗为3根管(占56.5%);94颗为4根管(占43.5%),根管数目变异以近中颊根第二根管(second mesiobuccal canal,MB2)出现频率较高,占比41.2%。上颌第二乳磨牙MB2的发现率在性别(X^2=1.004,P=0.316)及牙位方面的差异(X^2=0.072,P=0.788)没有统计学意义。结论上颌第二乳磨牙根管数目存在较多变异,MB2发现率较高。

Objective To investigate the root canal numbers of maxillary second primary molars.Methods216maxillary second primary molars from204children aged3?8years old were selected.All the teeth need to do the root canal therapy.After opening the pulp chamber,the root canal were examined and determined with small size K file and17%ethylene diaminetetraacetic acid(EDTA).Hand instruments were used for root canal preparation and then zinc?oxid-iodoform paste was used for filling.Results216maxillary second primary molars,122teeth had three root canals(56.5%),and94teeth had four root canals(43.5%).The incidence of second mesiobuccal canal(MB2)was41.2%.There was no correlation between the incidence of the MB2canal and gender and tooth position.Conclusion The root canals of maxillary second primary molars had more variations,and there was a high incidence of the second mesiobuccal canal.