Volume and morphological characteristics of masticatory muscles in patients with unilateral disc displacement without reduction and asymptomatic individuals

IF 2 3区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Stomatology Oral and Maxillofacial Surgery Pub Date : 2025-10-01 DOI:10.1016/j.jormas.2025.102405

Berk Bilgen , Selahattin Durmaz , Mehmet Barburoğlu , Sina Saygılı , Tonguç Sülün

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引用次数: 0

Abstract

Background

The temporomandibular joint (TMJ) functions as an integrated unit, therefore pathology affecting one side may affect the other. This cross-sectional study aimed to evaluate the effect of unilateral disc displacement without reduction (DDWoR) on the volumes of three masticatory muscles. Additionally, it investigated the relationship between lateral pterygoid muscle (LPM) attachment type, its volume and DDWoR.

Methods

A total of 84 TMJ MRI samples were analyzed. The control group consisted of 44 TMJ MRI samples, obtained separately from both TMJs of 22 bilaterally healthy individuals. The study group included 20 patients with unilateral DDWoR; MRI samples of unaffected TMJs formed the first study group (n = 20) and MRI samples of the affected TMJs formed the second study group (n = 20). In all groups, the LPM, masseter (MM), and medial pterygoid (MPM) muscle volumes were measured and LPM attachment types were classified. One-way ANOVA, Fisher’s Exact and Chi-square tests were applied, while MANCOVA assessed the effects of gender, age and body-mass index (BMI) on muscle volume and the estimated marginal means were calculated accordingly.

Results

The MM volume was significantly higher in the control group compared to study groups (p = 0.002), with no difference between the two study groups (p = 1.000). LPM (p = 0.688) and MPM (p = 0.348) volumes showed no significant differences between groups. No casual relationship was identified between LPM attachment type and DDWoR (p = 0,981). Type-III attachment was associated with higher muscle volume.

Conclusion

Unilateral DDWoR may affect MM morphology, highlighting the importance of evaluating masticatory muscles during treatment planning. Additionally, reduced MM volume may serve as a marker in the clinical diagnosis of DDWoR.

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无症状单侧椎间盘移位患者咀嚼肌的体积和形态特征İndividuals。

背景：颞下颌关节（TMJ）作为一个整体，因此一侧的病理可能会影响另一侧。本横断面研究旨在评估单侧椎间盘不复位移位（DDWoR）对三条咀嚼肌体积的影响。此外，本文还探讨了外侧翼状肌（LPM）附着类型、体积与DDWoR的关系。方法：对84例颞下颌关节MRI标本进行分析。对照组包括44个TMJ MRI样本，分别从22名双侧健康个体的两个TMJ中获得。研究组包括20例单侧DDWoR患者；未患TMJs的MRI样本组成第一研究组（n=20），患TMJs的MRI样本组成第二研究组（n=20）。在所有组中，测量LPM、咬肌（MM）和内侧翼状肌（MPM）的体积，并对LPM的附着类型进行分类。采用单因素方差分析、Fisher’s Exact检验和卡方检验，而MANCOVA评估性别、年龄和身体质量指数（BMI）对肌肉体积的影响，并据此计算估计的边际均值。结果：对照组MM体积明显高于研究组（p=0.002），两组间无差异（p=1.000）。LPM （p=0.688）和MPM （p=0.348）体积组间差异无统计学意义。LPM依恋类型与DDWoR之间没有因果关系（p= 0.981）。iii型附着体与较高的肌肉体积相关。结论：单侧DDWoR可能影响MM形态，强调在治疗计划中评估咀嚼肌的重要性。此外，MM体积减少可作为DDWoR临床诊断的标志。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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