下颌第一、二恒磨牙牙根变异的锥形束CT 观察

摘要/Abstract

摘要： 目的: 揭示华东地区中国人下颌第一、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扫描的患者的CT图像资料, 共261例患者。观察下颌恒磨牙牙根变异的牙发生率、个体发生率及双侧分布状况。采用SPSS 13.0软件包对数据进行χ2检验、Spearman等级相关分析。结果: 下颌第一恒磨牙远舌根变异的牙发生率为24.7%(108/437牙), 个体发生率为27.9%(56/201人), 双侧共同发生率为66.1%(37/56), 相关系数为0.738(P<0.01)。下颌第二恒磨牙C形根的牙发生率43.3%(180/416牙), 个体发生率为49.7%(96/193人), 双侧共同发生率为79.2%(76/96), 两侧相关系数为0.790(P<0.01);女性发生率均高于男性(P<0.05)。上述2种牙根变异之间未发现显著相关性(r=0.033, P>0.05)。结论: 下颌第一恒磨牙远舌根变异及下颌第二恒磨牙C形根在华东地区人群中具有较高的发生率, 掌握其分布特点具有重要的临床指导意义。

关键词: 下颌恒磨牙, 锥形束CT, 牙根变异

Abstract: PURPOSE: To explore the prevalence and distribution pattern of the root variations of permanent mandibular first and second molars in an eastern Chinese population. METHODS: Cone-beam computed tomography images were collected retrospectively from 261 Chinese patients in Suzhou Stomatological Hospital. The incidences of the root variations were determined. The trait frequency differences between genders and sides were tested using Chi-square test with SPSS 13.0 software program. Correlations in the occurrence of the root variations between antimeric teeth, as well as between the two types of molars were analyzed with Spearman rank correlation test. RESULTS: The incidence of three-rooted mandibular molars was 24.7% (108/437) counted by teeth, and 27.9% (56/201) counted by individuals. The incidence of the antimeric teeth in both sides was 66.1% (37/56) and the correlation coefficient was 0.738 (P< 0.01). The incidence of C-shaped rooted in mandibular second molars was 43.3% (180/416) counted by teeth, and 49.7% (96/193) counted by individuals. The bilateral incidence was 79.2% (76/96) and the correlation coefficient was 0.790 (P< 0.01). The incidence of the female group was significantly (P<0.05) higher than males. No significant correlation was found between the occurrence of three-rooted mandibular first molars and group C-shaped toot in mandibular second molars (r=0.033, P>0.05). CONCLUSIONS: The prevalence of three-rooted mandibular first molars and C-shaped root in mandibular second molars are high in the eastern Chinese population. Understanding their distribution patterns may be useful for clinical practice.

Key words: Permanent mandibular molar, CBCT, Root variation

中图分类号:

R782.1

陈玲, 陈建国, 顾永春. 下颌第一、二恒磨牙牙根变异的锥形束CT 观察[J]. 上海口腔医学, 2014, 23(2): 224-228.

CHEN Ling, CHEN Jian-guo, GU Yong-chun. Detection of root variations of permanent mandibular first and second molars by cone-beam computed tomography[J]. Shanghai Journal of Stomatology, 2014, 23(2): 224-228.

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