下颌后牙C形根管的锥形束CT研究

doi:10.6040/j.issn.1671-7554.0.2017.826

摘要/Abstract

摘要： 目的运用锥形束CT(CBCT)研究下颌后牙C形根管解剖形态,为根管治疗提供影像学依据。方法用CBCT观察350例共2 603颗下颌后牙影像资料,按性别、年龄、牙位分组,统计C形根管发生率,观察根管形态。年龄组间用Fisher确切概率检验,性别及牙位组间用卡方检验。结果 (1) 下颌第一前磨牙C形根管发生率2.60%,第二前磨牙0.00%,第一磨牙0.16%,第二磨牙31.65%; (2) 下颌第一前磨牙从根颈1/3到根尖1/3 C形根管出现最多的依次是C4、C3a和C4型,第二磨牙依次是C1、C2和C3型;根面深纵沟常在下颌第一前磨牙近舌侧(55.56%),第二磨牙舌侧(97.00%);(3)牙位和性别分组,下颌第一前磨牙和第二磨牙差异均无统计学意义(P>0.05)。年龄分组,第一前磨牙差异无统计学意义(P>0.05);第二磨牙,20~30岁和≤20岁更易出现C形根管(P<0.001)。结论下颌后牙C形根管形态复杂,常发生在第二磨牙,其次是第一前磨牙,极少发生在第二前磨牙和第一磨牙。

关键词: 下颌后牙, C形根管, 锥形束CT, 解剖形态, 发生率

Abstract: Objective To evaluate the anatomical features of C-shaped canal system in mandibular posterior teeth using cone-beam computed tomography(CBCT)in order to provide imaging information for root canal therapy. Methods A total of 2 603 mandibular posterior teeth in 350 people were observed with CBCT. The incidence of C-shaped root canal was calculated, which was then checked with Fisher exact probability test in different age groups, and with Chi-square test in different gender and tooth position groups. Results (1) The incidence of C-shaped root canal was 2.60%, 0.00%, 0.16% and 31.65% among mandibular first premolars, second premolars, first molars and second molars. (2) In mandibular first premolar, the most common type of canal configuration was C4 in the coronal, followed by C3a in the middle and C4 in the apical. In mandibular second molar, the most common type was C1 in the coronal, followed by C2 in the middle and C3 in the apical. The deep longitudinal ditch of root surface appeared in the mesiolingual side(55.56%)of mandibular premolars and in the lingual side(97.00%)of second molars. (3) There were no significant difference in mandibular first premolars and second molars among different groups of teeth position and gender(P>0.05). Among different age groups, no significant difference was observed in mandibular first premolars(P>0.05), while in second molars, people aged 20-30 years and ≤20 years were more prone to have C-shaped root canal(P<0.001). Conclusion The C-shaped root canals in human mandibular posterior molars have various shapes, often occurring in the second molars, followed by the first premolars, and rarely occurring in the second premolars and first molars.

Key words: Mandibular posterior teeth, C-shaped root canal, Cone-beam computed tomography, Anatomic morphology, Incidence rate

中图分类号:

R781

张静,杨兴华,李建华,葛堂娜,张淑存,熊世江. 下颌后牙C形根管的锥形束CT研究[J]. 山东大学学报 (医学版), 2018, 56(2): 56-61.

ZHANG Jing, YANG Xinghua, LI Jianhua, GE Tangna, ZHANG Shucun, XIONG Shijiang. C-shaped root canal in mandibular posterior teeth evaluated by cone-beam computed tomography[J]. Journal of Shandong University (Health Sciences), 2018, 56(2): 56-61.

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