下颌第一磨牙根管形态的CBCT研究

摘要/Abstract

摘要： ［摘要] 目的应用锥形束计算机断层扫描(cone-beam computed tomography, CBCT)技术，对下颌第一磨牙(mandibular first molar, MFM)根管形态进行研究。方法从CBCT影像数据库中筛选出1 067例患者共1 741颗MFM的CBCT影像。分析MFM牙根数目、根管形态及牙根数目、近中中根管(mesial middle canal，MMC)发生率与性别、年龄的关系。结果三根MFM发生率为29.81%(519/1 741)，无明显性别差异 (P＞0.05)。近中根管多为Vertucci Ⅳ型，34.20%的双根MFM（415/1 220）及36.61%的三根MFM（190/519）的近中根根管均为Vertucci Ⅳ型。远中根管则多为Vertucci Ⅰ型，双根MFM中42.54%的远中根（519/1 220）、三根MFM中93.26%的远颊根(484/519)、100%的远舌根(519/519)均为Vertucci Ⅰ型根管，无明显性别差异（P＞0.05）。此外，MMC的总体发生率为6.49%(113/1 741)，会随着年龄的增长而逐步下降，且男性(7.04%，68/965)发生率明显高于女性(5.80%，45/776) (P＜0.05)。结论 CBCT对于发现MMC及其他复杂根管形态具有重要价值。三根MFM的发生率无显著性别差异。MMC总体发生率为6.49%，男性高于女性，且随着年龄增长而逐步降低。

关键词: CBCT, 下颌第一磨牙, 近中中根管, 根管形态

Abstract: Purpose: The aim of this study was to evaluate the root and canal configuration of mandibular first molars (MFMs) in a native Chinese population using cone-beam computed tomography (CBCT). Materials and Methods: CBCT images of 1741 MFMs from 1067 patients were retrieved from a CBCT imaging database. The root number, canal morphology and correlation between root number and the prevalence of middle mesial canals (MMCs) with sex and age were analyzed. Results: The prevalence of three-rooted MFMs was 29.81% (519/1741), with no significant sex difference(P>0.05). The prevalence of Vertucci type IV canals was 34.20% (415/1220) in the mesial roots of two-rooted MFMs and 36.61% (190/519) in three-rooted MFMs. Vertucci type I canals were mostly detected in the distal roots (42.54%, 519/1220) of two-rooted MFMs, and the distobuccal (93.26%, 484/519) and distolingual (100%, 519/519) roots of three-rooted MFMs. No significant sex differences were observed. Additionally, the overall prevalence of MMCs was 6.49% (113/1741). The prevalence of MMCs decreased with age over 20 years old, and the incidence was higher in males (7.04%, 68/965) than females (5.80%, 45/776) (P<0.05). Conclusions: CBCT was valuable in detecting MMCs in MFMs, as well as other complex root canal morphology. There was no significant sex difference in the occurrence of three-rooted MFMs. The prevalence of MMCs was higher in males than females, with an average prevalence of 6.49%, and the incidence was lower in older versus younger patients.

Key words: Cone-beam computed tomography, mandibular molar, mesial middle canal, root canal morphology

中图分类号:

R816.98

陆亚倩杨晨露刘亚文闫明李谨吴大明. 下颌第一磨牙根管形态的CBCT研究[J]. 口腔医学, 2020, 40(5): 443-447.

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