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Quantitative volume and area assessment of masticatory muscles through magnetic resonance imaging in patients with temporomandibular joint disorders

Published:November 10, 2022DOI:https://doi.org/10.1016/j.oooo.2022.11.003

      Abstract

      Objective: To compare volume and surface area measurements of the lateral and medial pterygoid and masseter muscles (LPM, MPM, and MM) as calculated on magnetic resonance imaging (MRI) based on the position of the temporomandibular joint disk, mouth position, and patient sex, and to calculate the correlations of the measurements among the muscles.
      Study Design: Measurements of muscle volume and area were performed on MRIs of 51 patients. Wilcoxon, Kruskal-Wallis, and Mann-Whitney U tests were used to calculate the significance of differences in measurements. The Spearman correlation coefficient calculated correlation of measurements among the muscles. Significance of difference was established at P<0.05.
      Results: Volume and area of the left MPM in patients with disk displacement without reduction (DDWOR) were larger than in patients with normal disk position (P ≤ 0.040). MM volumes were smaller with DDWOR than with DD with reduction bilaterally (P ≤ 0.031). Volume and area of LPM and MM were significantly different between closed and open mouth positions (P < 0.001). Differences in volume and area between females and males were significant for all muscles in volume (P ≤ .021) and for MPM and MM in area (P ≤ .021). Significant positive correlations were found among all muscles for volume and area.
      Conclusion: Volume and area measurements of the masticatory muscles varied according to disk and mouth position and patient sex.

      Keywords

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