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苏州地区汉族人上颌第一、二恒磨牙牙根变异的锥形束CT观察
引用本文:陈玲,顾永春. 苏州地区汉族人上颌第一、二恒磨牙牙根变异的锥形束CT观察[J]. 口腔医学, 2014, 0(12): 907-910
作者姓名:陈玲  顾永春
作者单位:1. 苏州口腔医院牙体牙髓科,江苏苏州,215000
2. 苏州市吴江区第一人民医院口腔科,江苏苏州,215000
摘    要:
目的揭示苏州地区汉族人群上颌第一、二恒磨牙各型牙根变异的发生状况。方法调取苏州口腔医院放射科接受锥形束CT扫描的汉族患者的CT图像资料,患者共257人。观察上颌恒磨牙牙根变异的牙齿发生率、个体发生率及双侧分布状况。率的比较采用卡方检验,左、右侧的相关性采用Spearman等级相关性分析。结果上颌第一恒磨牙融合根的牙齿发生率3.1%(15/484)。上颌第二恒磨牙3根的牙齿发生率为69.7%(285/409),双侧共同发生率为60.3%(117/194),男、女组间以及双侧差异均无统计学意义(P>0.05);牙根变异以2个颊侧根融合最常见(11.7%),其次为融合性单根(10.5%),近颊根与腭根融合的发生率为4.9%。牙根变异在左、右同名牙间具有显著的相关性,相关系数rho=0.607(P<0.01)。结论上颌第一恒磨牙较少发生牙根变异;上颌第二恒磨牙融合根在苏州地区汉族人中具有较高的发生率,掌握其分布特点具有重要的临床意义。

关 键 词:上颌恒磨牙  锥形束CT  牙根变异

Cone-beam CT observation of the root variations of permanent maxillary first and second molars in a Chinese Han population in Suzhou Prefecture
CHEN Ling,GU Yong-chun. Cone-beam CT observation of the root variations of permanent maxillary first and second molars in a Chinese Han population in Suzhou Prefecture[J]. Stomatology, 2014, 0(12): 907-910
Authors:CHEN Ling  GU Yong-chun
Affiliation:CHEN Ling, GU Yong-chun. ( Department of Endodontics , Suzhou Stomatological Hospital, Suzhou 215000, China)
Abstract:
Objective To explore the prevalence and distribution pattern of the root variations of permanent maxillary first and sec- ond molars in a Chinese Han population in Suzhou Prefecture. Methods Cone-beam computed tomography images of dentitions were collected retrospectively from 257 Han Chinese patients in Suzhou Stomatological Hospital. The incidences of the root variations were ob- served and determined. The trait frequency differences between genders and sides were tested with Chi-square tests. Correlations in the occurrence of the root variations between antimeric teeth were analyzed with the Spearman rank correlation test. Results The occur- rence rate of fused roots in maxillary first molars was 3.1% ( 15/484 teeth). The frequency of maxillary second molars with 3 separated roots was 69.7% (285/409 teeth), and the bilateral concurrence rate was 60.3% (117/194). The differences between genders and sides were not statistically significant( P 〉 0.05 ). The most common variation form was the fusion of the mesiobuceal and distobueeal roots (11.7% ), followed by the single rooted form (10.5%) and the fusion of the mesiobuccal and palatal roots(4.9). The correlation coefficient for the antimeric second molars was 0. 607 (P 〈 0.01 ). Conclusions The root variation rarely occurs in maxillary first mo- lars whereas in maxillary second molars,the prevalence of fused roots is high in the Chinese Han population in Suzhou prefecture. It is of great clinical significance to understand and grasp their distribution patterns.
Keywords:Permanent maxillary molar  cone-beam computed tomography  root variation
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