Investigation of the masseter and temporalis muscles thicknesses in individuals with and without temporomandibular disorders by ultrasonography: A randomized controlled study

Abstract

Aim: The aim was to evaluate the impact of different temporomandibular disorder (TMD) diagnoses on the thickness of the masseter and temporalis muscles. Materials and Methods: Individuals were divided into four groups: (1) myofascial pain; (2) disc displacements; (3) mixed group; and (4) asymptomatic control group. 53 individuals with TMD and 20 individuals without TMD were recruited. Results: No significant differences were found among groups in masseter and temporalis muscles thickness at rest and maximum contraction (p>0.05). However, the masseter muscle thickness at rest and maximum contraction were greater in asymptomatic individuals than in individuals with TMD (p<0.05). Conclusion: Masseter and temporalis muscles thickness are similar in the TMD subgroups and the asymptomatic control group at rest and maximum contraction.