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Title: [Preliminary MRI evaluation of anterior repositioning splint in treatment of disc displacement with reduction of temporomandibular joint].
Author: Wang XR, Qiao YM, Qiao Y.
Journal: Zhonghua Kou Qiang Yi Xue Za Zhi; 2022 Sep 09; 57(9):914-920. PubMed ID: 36097937.
Abstract:
Objective: MRI images were used to study the efficacy of anterior repositioning splint (ARS) in the treatment of different types of disc displacement with reduction (DDWR) in temporomandibular joint. Methods: From September 2020 to December 2021, 26 patients with DDWR were enrolled in the Department of Oral and Maxillofacial Surgery, the First Affiliated Hospital of Zhengzhou University. There were 5 males and 21 females with an average age of (20.8±5.8) years. ARS was used for 3-6 months. The changes of joint clicking, opening type and joint pain before and after treatment were compared. The changes of disc position, disc-condyle angle and condylar bone mass before and after treatment were compared by MRI. Paired t-test was performed on the disc-condyle angle before and after treatment, Fisher's exact test was performed on the change of disk position, and other count data were expressed as rate (%). Results: After ARS treatment, the effective rates of joint clicking,abnormal opening, joint pain and disc displacement were 97%(35/36), 14/18, 7/9 and 95%(36/38). MRI analysis found that there was a significant difference between the disc position before and after treatment (P<0.001), MRI analysis showed that the anterior disc displacement (48%, 25/52) and the anterolateral disc displacement (17%, 9/52) were the most common before treatment. In contrast, the normal superior disc (75%, 39/52) and the anterior disc displacement (17%, 9/52) were the most common after treatment, no significant changes were seen after treatment in the anteromedial disc displacement. The disc-condylar angle was (36.09±19.02) ° before ARS treatment and (3.94±10.12) ° after ARS treatment(t=9.23, P<0.001). After treatment, 46% (12/16) of the patients showed new bone formation, and the height of the condyle recovered. Conclusions: The clinical efficacy of ARS in the treatment of anterior disc displacement and anterolateral displacement of temporomandibular joint is remarkable, which can restore the disc-condylar relationship of most patients with indications. 目的： 通过MRI研究再定位（牙合）垫治疗颞下颌关节不同类型可复性关节盘前移位复位疗效。 方法： 纳入2020年9月至2021年12月于郑州大学第一附属医院口腔颌面外科就诊的轻度可复性关节盘前移位患者26例，男性5例，女性21例，年龄（20.8±5.8）岁。使用再定位（牙合）垫治疗3~6个月，比较治疗前后关节弹响、开口型和关节疼痛程度的变化，通过MRI比较治疗前后关节盘位置、盘-髁角度及髁突骨量的变化。治疗前后的盘-髁角度进行配对t检验，关节盘位置的变化采用Fisher确切概率法进行分析，其他计数资料以率（%）表示。 结果： 经再定位（牙合）垫治疗后关节弹响、开口型异常、关节疼痛症状和关节盘移位的治疗有效率分别为97%（35/36）、14/18、7/9和95%（36/38）。MRI图像分析显示治疗前后的关节盘位置差异有统计学意义（P<0.001），治疗前关节盘位置依次是关节盘前移位［48%（25/52）］、关节盘位置正常［27%（14/52）］和前外侧移位［17%（9/52）］；治疗后关节盘位置是关节盘位置正常［75%（39/52）］和关节盘前移位［17%（9/52）］，关节盘前内侧移位者治疗后未见明显改变。再定位（牙合）垫治疗后盘-髁角度（3.94°±10.12°）显著小于治疗前（36.09°±19.02°）（t=9.23，P<0.001）。治疗后46%（12/26）的患者出现髁突新骨生成，髁突高度有所恢复。 结论： 再定位（牙合）垫治疗颞下颌关节可复性关节盘前移位和前外侧移位的临床疗效显著，可使符合适应证的大部分患者盘-髁关系恢复正常。.

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