Abstract
Objectives
The aim of the study was to identify predictors of the masticatory muscle activity during chewing (MMA) of the masseter and temporalis anterior (TA) muscles in patients with unilateral myogenous temporomandibular disorder (mTMD).
Materials and methods
This observational and cross-sectional study included 109 patients diagnosed with unilateral mTMD. Surface electromyography was used to separately evaluate the MMA of the masseter and TA on the affected and unaffected sides. Also, pain intensity (with a visual analog scale), pressure pain threshold (with an algometer), active pain-free maximum mouth opening and temporomandibular joint lateral movements (with a ruler), cervical range of motions (with a goniometer), and TMD severity (with a Fonseca Anamnestic Index) were assessed. Various statistical methods were used to predict the MMA of the masseter and TA, including standard, forward, and best subsets multiple regression models.
Results
While there were significant correlations between the MMA of the masseter and TA and pain intensity, pressure pain threshold values, and TMD severity, they were not found with other variables. These parameters were also predictive factors for MMA of both muscles (p < 0.05).
Conclusions
According to the present study, pain intensity, muscle and joint tenderness, and the severity of the disorder are predictive factors for MMA of the masseter and TA muscles in patients with mTMD. It is recommended that these parameters be considered when establishing clinical evaluation and treatment programs focusing on MMA in patients with mTMD.
Clinical relevance
The pain intensity, masticatory muscles and TMJ tenderness, and disorder severity are predictors for MMA of the masseter and TA in patients with mTMD. Pain intensity has the most significant importance.
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N.T.Y. and H.K. contributed to data acquisition, conception, design, and data interpretation, and drafted and critically revised the manuscript. H.Y. contributed to the conception, design, and data interpretation, performed the statistical analysis, and, drafted and critically revised the manuscript. All authors approved the final version of the manuscript.
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This study was approved by the Karamanoğlu Mehmetbey University Faculty of Medicine Clinical Research Ethics Committee (Decision no: 06–2022/12). Written informed consent was obtained from all patients who were given detailed information about the study. The study was conducted in accordance with the principles of the Declaration of Helsinki.
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Yıldız, N.T., Kocaman, H. & Yıldırım, H. Predictors of the masticatory muscle activity during chewing in patients with myogenous temporomandibular disorder. Clin Oral Invest 27, 6547–6558 (2023). https://doi.org/10.1007/s00784-023-05260-3
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DOI: https://doi.org/10.1007/s00784-023-05260-3