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山东大学学报 (医学版) ›› 2022, Vol. 60 ›› Issue (3): 100-109.doi: 10.6040/j.issn.1671-7554.0.2021.1182

• • 上一篇    

1 125颗下颌第一恒磨牙近中中央根管的CBCT检出率及相关因素分析

王煜1,2,3,尹增正1,2,3,聂晓琨4,马志德1,2,3,熊世江1,2,3   

  • 发布日期:2022-03-09
  • 通讯作者: 熊世江. E-mail:xiongsj@sdu.edu.cn

Detection of middle mesial canal in 1,125 permanent mandibular first molars using CBCT and related factors

WANG Yu1,2,3, YIN Zengzheng1,2,3, NIE Xiaokun4, MA Zhide1,2,3, XIONG Shijiang1,2,3   

  1. 1. Department of VIP Center, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan 250012, Shandong, China;
    2. Shandong Key Laboratory of Oral Tissue Regeneration, Jinan 250012, Shandong, China;
    3. Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan 250012, Shandong, China;
    4. The First Department of Cariology and Endodontics, Jinan Stomatology Hospital, Jinan 250001, Shandong, China
  • Published:2022-03-09

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摘要： 目的 通过锥形束CT(CBCT)观察下颌第一磨牙近中中央根管(MMC)的影像,研究其发生情况和相关特点,为MMC的临床治疗提供理论依据。 方法 观测就诊于山东大学口腔医院的637例患者共1 125颗下颌第一磨牙的CBCT,记录MMC的发生、解剖结构,分析各解剖因素与MMC检出率及根管类型的关联性。测量分析MMC弯曲情况。 结果 (1)下颌第一磨牙MMC的牙齿检出率为12.80%。检出率男性高于女性,左侧高于右侧。有MMC组的MB-ML根管口间距较大。MMC发生与牙位、远舌根、MB-ML根管口间距具有相关性。(2)MMC的类型以3-2融合型最多,其中MMC与MBC或MLC融合与近中3个根管口间距离具有相关性。(3)MMC以重度弯曲居多。近远中向弯曲度女性大于男性,年龄60~80岁组的更小。近远中向弯曲半径女性小于男性。近远中向弯曲度大于颊舌向弯曲度。 结论 下颌第一磨牙MMC检出率男性较女性高,左侧更多见。MB-ML根管口间距越大或存在远舌根者,MMC存在的可能性越大。3-2型MMC与MBC或MLC根管口间距越近,与该根管融合可能性越大。MMC近远中向弯曲度较大,女性的MMC更易出现急弯。60~80岁组MMC弯曲度较小。

关键词: 下颌第一恒磨牙, 近中中央根管, 锥形束CT, 检出率, 根管类型, 弯曲度, 相关因素

Abstract: Objective To explore the incidence and relevant anatomy of the middle mesial canal(MMC)of permanent mandibular first molars in order to provide theoretical guidance for root canal therapy. Methods Cone-beam computed tomography(CBCT)images of 1,125 permanent mandibular first molars of 637 patients treated at Stomatological Hospital of Shandong University were observed. The detection rate and anatomic structure of MMC were recorded to analyze the relationship between the anatomic factors, incidence of MMC and types of mesial canal. Curvature of MMC was measured. Results (1) The detection rate of MMC was 12.8%, higher in male than in female, higher on the left side than on the right side. Patients with MMC had longer distance between MB-ML root canal orifices. The occurrence of MMC was correlated with the tooth position, distal lingual root and distance between MB-ML root canal orifices. (2) The 3-2 fusion type of MMC was the most common, and the fusion between MMC and MBC or MLC was correlated with the distance among the 3 proximal root canal orifices. (3) Most MMCs had severe curvature. The curvature in the proximal and distal direction was larger in female than in male, and patients aged 60-80 years had smaller curvature. The curvature in the proximal and distal direction was larger than that in the buccal and lingual direction. Conclusion The detection rate of MMC is higher in male than in female, higher on the left side than on the right side. The distance between MB-ML root canal orifices and the existence of distal lingual root are positively related with the incidence of MMC. The MMC of 3-2 type is prone to fuse with the canal close to it. The MMC in the proximal and distal direction has larger curvature, especially in female. The curvature of MMC in patients aged 60-80 years is smaller.

Key words: Mandibular first molar, Middle mesial canals, Cone-beam computed tomography technique, Detection rate, Root canal type, Curvature, Related factors

中图分类号: 

  • R781
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