上颌磨牙腭侧双根发生率及解剖特征的锥形束CT研究  

Evaluation of the prevalence of the maxillary molars with two palatal roots by cone-beam CT

作　　者：杨博[1] 陆群[1] 白庆霞[1] 张艳[1] 刘晓静[1] 刘朝娟[1] 

机构地区：[1]第四军医大学口腔医学院牙体牙髓病科,西安710032

出　　处：《中华口腔医学杂志》2013年第6期359-362,共4页Chinese Journal of Stomatology

摘　　要：目的利用锥形束CT观察上颌磨牙腭侧双根的发生率及解剖结构特征，以期为临床提供参考。方法收集528例（1957颗上颌磨牙）锥形束CT的临床三维影像资料，记录患者年龄、性别、观察牙位及腭根数目，观察腭侧双根的发生率、解剖特征及腭侧双根与性别、观察牙位等因素的关系。结果上颌磨牙腭侧双根的发生率为0．72％（14／1957），上颌第二磨牙腭侧双根的发生率[1．12％（11／979）]高于第一磨牙[0．31％（3／978）]。上颌腭侧双根的根管口平均距离为（2．84±0．50）inm，近腭根与远腭根牙根长轴夹角平均值为（34．6±16．1）°，均显著大于两颊根的根管口平均距离[（2．15±0．82）mm]和牙根长轴夹角[（21．3±12．2）°]（P〈0．05）。上颌磨牙腭侧双根的发生与性别、左右方位因素无显著相关性（P〉0．05）。结论上颌第二磨牙腭侧双根的发生率大于第一磨牙，两腭根的根管口平均距离及两腭根夹角均显著大于两颊根，腭侧双根预备难度大于颊侧双根，需谨防器械分离。Objective To investigate the characteristic of the maxillary molars with two palatal roots and its prevalence by cone-beam computered tomography. Methods Cone-beam CT （CBCT） images of dentitions were collected retrospectively from 528 patients comprising 1957 maxillary molars. The characteristic and prevalence of maxillary molars with two palatal roots was analyzed. The tooth position, sex and unilateral and bilateral occurrence were recorded. Results The prevalence of two palatal roots was 0. 72% （14/1957）. Maxillary second molar with two palatal roots was detected in 1.12% （ 11/979）, which showed a statistically higher prevalence than maxillary first molar 0. 31% （3/978）. This prevalence did not differ with sex or the side（ P 〉 0.05 ）. The mean distance of interorifice from the mesiolpalatal canal to the distopalatal canal was（2. 84 ＋0. 50） ram,and the angle between two palatal roots was on average（34. 6 ＋ 16. 1 ）o, which were significantly greater than the mean distance of interorifice from the two buccal roots （2. 15 ＋ 0. 82） mm and the angle between the two roots was （21.3 ＋ 12. 2）o. Conclusions The prevalence of maxillary second molars with two palatal roots was higher than that of the first malars. The angle between the two palatal roots brings difficulty to root canal therapy, so the consciousness of double palatal roots of maxillary molars was helpful for clinical operation.

关 键 词：锥束计算机体层摄影术 磨牙 牙髓腔 腭根 

分 类 号：R781.05[医药卫生—口腔医学]