藏族和汉族上颌第一恒磨牙近中颊根的CBCT对比研究

目的:比较藏族和汉族上颌第一恒磨牙近中颊根数据,为临床提供参考。方法:随机收集藏族和汉族患者上颌第一恒磨牙近中颊根CBCT图像440例,测量根长、弯曲度、弯曲位置、是否有第二近颊根(MB2)、MB-MB2距离。结果:藏族第一恒磨牙近中颊根长度较汉族长,差异有统计学意义(P<0.05)。近中颊根根管弯曲度比较,藏汉族有统计学差异,汉族以2级(10°<根管弯曲度<30°)居多,而藏族不仅2级较多,3级(根管弯曲度>30°)也较汉族多。根管弯曲位置方面,汉族以根管中分的弯曲居多,而藏族不仅根管中分的弯曲较多,根管口和根尖弯曲也较多,差异有统计学意义(P<0.05)。藏汉族的MB2发生率、MB-MB2距离比较差异无统计学意义。结论:藏族和汉族上颌第一恒磨牙近中颊根的根长、根管弯曲度、根管弯曲位置有差别,藏族牙根更长,弯曲度更大,特别是根尖区弯曲度,值得临床注意。而MB2发生率和MB-MB2距离藏汉族无差异。

Comparative Study on Mesial Buccal Root of First Permanent Maxillary Teeth between Tibetans and Hans through CBCT

Objective:To compare the mesial buccal root of the first maxillary molars of Tibetan and Han adults,and provide a reference for clinical root canal treatment.Methods:The 440 CBCT images of the mesial buccal root of the first maxillary molars of Tibetans and Hans were collected randomly.Root length,curvature,bending position,the possibility of second buccal root(MB2),and MB-MB2 distance were measured.Results:The mesial buccal root length of Tibetan was longer than that of Hans(P<0.05).There was a statistical difference in the bending degree of the root canal in the mesial buccal roots between Tibetan and Han people.The majority of the Han people were grade 2(10°30°).There was a statistically significant difference between the Tibetan and Han nationalities on the mesial buccal root canal bending position(P<0.05).There was no statistically significant difference in the incidence of MB2 and distance of MB-MB2 between Tibetan and Han people.Conclusion:The root length of the buccal root,the curvature of the root canal,and the position of the root canal are different.The Tibetan tooth root is longer and the curvature is greater,especially at the apical area.There was no difference between MB2 incidence and MB-MB2 distance between Tibetans and Hans.