口腔医学研究

口腔医学研究 ›› 2021, Vol. 37 ›› Issue (6): 523-527.DOI: 10.13701/j.cnki.kqyxyj.2021.06.010

• 口腔正畸学研究 • 上一篇    下一篇

基于锥形束计算机成像技术的骨性Ⅲ类错牙合下颌中切牙冠根形态特征分析

于淼, 徐依山, 李真真, 吴瑶, 刘佳, 曹宇, 张惠超, 杨陆一*   

  1. 吉林大学口腔医院正畸科 吉林 长春 130021
  • 收稿日期:2020-12-21 出版日期:2021-06-28 发布日期:2021-06-17
  • 通讯作者: *杨陆一,E-mail:lyyang@jlu.edu.cn
  • 作者简介:于淼(1995~ ),女,吉林人,硕士在读,主要从事口腔正畸学的研究工作。
  • 基金资助:
    吉林省卫生技术创新项目(编号:2017J069)

Analysis on Morphological Characteristics of Crown and Root of Mandibular Central Incisors with Skeletal Class Ⅲ Malocclusion Based on CBCT

YU Miao, XU Yishan, LI Zhenzhen, WU Yao, LIU Jia, CAO Yu, ZHANG Huichao, YANG Luyi*   

  1. Department of Orthodontics, Stomatology Hospital of Jilin University, Changchun 130021, China
  • Received:2020-12-21 Online:2021-06-28 Published:2021-06-17

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摘要： 目的:通过锥形束计算机成像技术(Cone-beam computed tomography,CBCT)对骨性Ⅲ类错牙合下颌中切牙冠根形态进行分析,并探讨其与牙槽骨形态之间的关系。方法:从拍摄CBCT的患者中随机选取40例骨性Ⅲ类错牙合患者为实验组,个别正常牙合15例为对照组,并且将实验组根据下中切牙唇倾度不同分为舌倾组和直立组2个亚组,测量下颌中切牙冠根角、冠长、根长、冠根比和实验组牙槽骨形态,并对数据进行统计学分析。结果:(1)实验组冠根角小于对照组(P<0.01);(2)骨性Ⅲ类错牙合患者直立组冠根角小于舌倾组(P<0.01),直立组根长大于舌倾组(P<0.05);(3)骨性Ⅲ类错牙合患者冠根形态与牙槽骨形态有不同程度相关性(P<0.05)。结论:骨性Ⅲ类错牙合患者下颌中切牙冠根成角明显,并且直立组和舌倾组中的下颌中切牙冠根形态存在显著差异;骨性Ⅲ类错牙合患者下颌中切牙冠根形态与牙槽骨形态有显著相关性。

关键词: 骨性Ⅲ类错牙合, 下颌中切牙, 冠长, 根长, 冠根角

Abstract: Objective: To investigate the crown-root morphology of mandibular central incisor in skeletal Class Ⅲ malocclusion by cone-beam computed tomography(CBCT)and explore its correlation with the related alveolar bone morphology. Methods: From the patients receiving CBCT, 40 patients with skeletal class Ⅲ malocclusion were randomly selected as the experimental group and 15 normal individuals as the control group. Further, the experimental group was subdivided into lingual inclination group and erection group according to different labial inclinations of the lower central incisor. The crown-root angle, crown length, root length, crown-root ratio of the mandibular central incisor, and the corresponding alveolar bone morphology of the experimental group were measured and analyzed statistically. Results: The crown-root angle in the experimental group was smaller than that in the control group (P<0.01). In the patients with skeletal class Ⅲ malocclusion, the crown-root angle in the erection group was smaller than that in the lingual inclination group (P<0.01). Among the patients with skeletal class Ⅲ malocclusion, the crown-root morphology was correlated with the corresponding alveolar bone morphology at different degrees (P<0.05). Conclusion: The crown-root angle of mandibular central incisor is obvious in patients with skeletal class Ⅲ malocclusion, and the crown-root morphology of mandibular central incisor is significantly different between the erection group and the lingual inclination group. There is a significant correlation between the crown-root morphology of mandibular central incisor and the corresponding alveolar bone morphology in patients with skeletal class Ⅲ malocclusion.

Key words: skeletal class Ⅲ malocclusion, mandibular central incisor, crown length, root length, crown-root angle