Journal of Oral Science Research ›› 2024, Vol. 40 ›› Issue (1): 66-72.DOI: 10.13701/j.cnki.kqyxyj.2024.01.013

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CBCT Measurement and Analysis of TMJ Morphology and Position in Low Angle Adolescents with Different Sagittal Facial Types

YU Xin, ZUO Zhigang, YANG Ziliang, WANG Hanping, ZHAO Yanhong, WANG Yue*   

  1. Department of Orthodontics, School of Stomatology, Tianjin Medical University, Tianjin 300070, China
  • Received:2023-08-07 Online:2024-01-28 Published:2024-01-22

Abstract: Objective: To investigate the difference of TMJ morphology and position in low angle adolescent patients with different sagittal skeletal surface types, and to explore the relationship between TMJ and craniofacial skeletal types. Methods: Twenty patients with low angle of skeletal class Ⅰ, Ⅱ, and Ⅲ aged 11-16 years were selected as the study group, and 20 patients with average angle of skeletal class Ⅰ were selected as the control group. The CBCT images were imported into Invivo5.2 software to obtain lateral cephalic and bilateral joint images, and the data were measured and investigated by statistical methods. Results: (1) There were significant negative correlations between FH-MP and condylar long axis diameter and condylar width in class Ⅰ low angle group, joint space in class Ⅱ low angle group and glenoid fossa depth in class Ⅲ low angle group. (2) Compared with the control group, the anterior joint space (P=0.022) in class Ⅰ low angle group and glenoid fossa depth (P=0.027) in class Ⅱ low angle group were significantly larger, and the articular eminence inclination (P=0.017) and horizontal condylar angle (P=0.016) in class Ⅲ low angle group were significantly smaller. (3) The condylar angle and articular eminence inclination (P<0.05) in class Ⅰ low angle group, mesial joint space (P≤0.01) in class Ⅱ low angle group, and condylar angle (P<0.01) in class Ⅲ low angle group showed that the right side was smaller than the left side. Conclusion: There are significant differences in the condyle shape, symmetry, and joint space of TMJ in adolescent patients with low angle of sagittal surface. Attention should be paid to the condyle growth status in orthodontic treatment, so as to achieve long-term stable treatment effect after orthodontic treatment.

Key words: cone-beam computed tomography, temporomandibular joint, sagittal skeletal pattern, adolescent, low angle