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山东大学学报 (医学版) ›› 2019, Vol. 57 ›› Issue (3): 85-90.doi: 10.6040/j.issn.1671-7554.0.2018.1001

• • 上一篇    

下颌第一恒磨牙远舌根的锥形束CT研究

聂晓琨1,2,郝新宇3,张淑存4,葛堂娜5,熊世江1,2   

  1. 1.山东省口腔组织再生重点实验室, 山东 济南 250012;2.山东大学口腔医院特诊科, 山东 济南 250012;3.山东大学口腔医院儿童口腔科, 山东 济南 250012;4.山东大学口腔医院城西分院牙体牙髓科, 山东 济南 250021;5.山东大学口腔医院牙体牙髓科, 山东 济南 250012
  • 发布日期:2022-09-27
  • 通讯作者: 熊世江. E-mail:xiongsj@sdu.edu.cn

A cone-beam computed tomographic study on the distolingual root of the permanent mandibular first molars

NIE Xiaokun1,2, HAO Xinyu3, ZHANG Shucun4, GE Tangna5, XIONG Shijiang1,2   

  1. 1. Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan 250012, Shandong, China;
    2. VIP Department, School of Stomatology, Shandong University, Jinan 250012, Shandong, China;
    3. Department of Pediatric Dentistry, School of Stomatology, Shandong University, Jinan 250012, Shandong, China;
    4. Department of Endodontics, Chengxi Branch of Hospital of Stomatology, Shandong University, Jinan 250021, Shandong, China;
    5. Department of Endodontics, Hospital of Stomatology, Shandong University, Jinan 250012, Shandong, China
  • Published:2022-09-27

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摘要： 目的 运用锥形束CT(CBCT)技术研究下颌第一恒磨牙远舌根的发生率、髓室底解剖、弯曲度,为临床下颌第一恒磨牙根管治疗提供理论指导和依据。 方法 观察1 164颗下颌第一恒磨牙的CBCT影像,测量远舌根的发生率、四根管型磨牙各根管口间距及DB-DL-ML角度、远舌根弯曲度。 结果 (1)下颌第一恒磨牙远舌根发生率为25.60%,右侧发生率高于左侧(P<0.05),男女间差异无统计学意义(P>0.05);(2)三根型与双根型四根管型磨牙发生率分别为25.60%和22.68%,两种类型的磨牙在DL-DB距离和DB-DL-ML角度间差异有统计学意义(P<0.05);(3)远舌根的颊舌向观弯曲度为(11.60±10.05)°,近远中向观弯曲度为(30.19±13.48)°,两者间差异有统计学意义(P<0.05)。弯曲部位多见于根中1/3。 结论 下颌第一恒磨牙远舌根发生率高,右侧发生率较左侧高,且三根型磨牙DL-DB距离较双根型四根管型磨牙更远,DB-DL-ML角度更锐利,并且远舌根形态弯曲,弯曲部位多位于多根中,近远中向观常存在重度弯曲。

关键词: 下颌第一恒磨牙, 远舌根, 锥形束CT, 发生率, 髓室底解剖, 弯曲度

Abstract: Objective To explore the incidence, curvature and anatomy of pulp floors of the distolingual roots of permanent mandibular first permanent molars in order to provide theoretical guidance and basis for root canal therapy. Methods The cone-beam computed tomography(CBCT)images of 1 164 permanent maxillary first molars with distolingual roots were measured. The incidence of distolingual roots, the distance between root canal orifices, DB-DL-ML angle and curvature of distolingual roots were determined. Results (1) The incidence of distolingual roots was 25.60%, and the incidence on the right side was higher than that on the left side(P<0.05). There was no significant difference in the incidence between male and female(P<0.05). (2) The incidence of three-rooted and two-rooted mandibular first permanent molars was 25.60% and 22.68%, respectively. There were significant differences between the two types in DL-DB distance and DB-DL-ML angle (P<0.05). (3) The curvatures of the distolingual root canal were greater in the bucco-lingual view(11.60±10.05)° than in the mesio-distal view(30.19±13.48)°(P<0.05). The distolingual root canal bending was mostly seen in the middle third of the root. Conclusion The incidence of distolingual roots of mandibular first molars is high, and the incidence on the right side is higher than that on the left side. The location of DL root canal orifices of three-rooted molars is farther from DB root canal orifice than that of two-rooted molars with four canals. DB-DL-ML angle is sharper in the 山 东 大 学 学 报 (医 学 版)57卷3期 -聂晓琨,等.下颌第一恒磨牙远舌根的锥形束CT研究 \=-three-rooted molars and the distolingual roots are curved. The curved parts are usually located in middle third, and the curvature in the mesio-distal view is severe.

Key words: Permanent mandibular first molars, Distolingual root, Cone-beam computed tomography, Incidence, Anatomy of the pulp floors, Curvature

中图分类号: 

  • R781
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