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

doi:10.13701/j.cnki.kqyxyj.2021.06.010

Abstract

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

YU Miao, XU Yishan, LI Zhenzhen, WU Yao, LIU Jia, CAO Yu, ZHANG Huichao, YANG Luyi. Analysis on Morphological Characteristics of Crown and Root of Mandibular Central Incisors with Skeletal Class Ⅲ Malocclusion Based on CBCT[J]. Journal of Oral Science Research, 2021, 37(6): 523-527.

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