A study on the arthroscopic temporomandibular joint disc reduction on the outcome of orthodontic patients with anterior disc displacement without reduction
10.3760/cma.j.cn112144-20230728-00042
- VernacularTitle:颞下颌关节不可复性盘前移位复位与否对错 畸形正畸疗效的影响
- Author:
Guoli ZHOU
1
;
Lingjun YUAN
;
Chao LIU
;
Ning ZHAO
;
Lunguo XIA
;
Bing FANG
Author Information
1. 上海交通大学医学院附属第九人民医院口腔正畸科 上海交通大学口腔医学院 国家口腔医学中心 国家口腔疾病临床医学研究中心 上海市口腔医学重点实验室 上海市口腔医学研究所，上海 200011
- Keywords:
Temporomandibular joint;
Orthodontics;
Malocclusion;
Anterior disc displacement;
Overjet
- From:
Chinese Journal of Stomatology
2023;58(10):996-1003
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the arthroscopic temporomandibular joint disc reduction on the outcome of orthodontic patients with anterior disc displacement without reduction.Methods:From January 2012 to December 2021, forty treated orthodontic patients with anterior disc displacement without reduction (unilateral/bilateral) and no obvious articular cartilage absorption were selected from Department of Orthodontics, Shanghai Ninth People′s Hospital, Shanghai Jiao Tong University School of Medicine. The patients were (17.5±3.8) years old (12-25 years old), including 8 males and 32 females. Twenty patients who had completed arthroscopic temporomandibular joint disc reduction were included in the control group, and twenty patients with untreated temporomandibular joint disc were included in the experimental group. Model measurement (including overjet, etc.), cephalometric analysis (including ANB angle, which was formed by subspinale, nasion and supramental, etc.) and temporomandibular joint magnetic resonance imaging (including measurement of the condyle height of the displacement sides) were used to compare the difference of two groups. Objective grading system was used to evaluate the efficacy of orthodontic treatment.Results:The overjet of the experimental group and the control group after orthodontic treatment was (2.19±0.76) and (1.92±0.94) mm, respectively. Both two groups achieved ideal overjet with no statistical difference ( t=1.02, P=0.314). The ANB angle difference before and after treatment in the control group (-1.97°±2.87°) was greater than that in the experimental group (0.09°±1.82°), and the difference was statistically significant ( t=2.72, P=0.010). The variation of condyle height before and after treatment was (0.30±1.11) mm in the experimental group and (0.82±1.25) mm in the control group, with no statistical significance ( t=1.80, P=0.076). The post-treatment objective grading system scores of the experimental group and the control group were 21.00 (16.00, 24.00) and 21.00 (17.00, 25.00), respectively, which had no statistical difference ( U=0.24, P=0.808). Conclusions:In orthodontic patients with anterior disc displacement without reduction and no obvious articular cartilage absorption, whether displaced discs are repositioned after arthroscopic surgery has no significant effect on the orthodontic treatment outcome.
