Another study, also analyzing the aspects of anxiety (STAI) and temporomandibular dysfunction (RDC/ TMD) using electromyographic recordings, found as a result from the evaluation of physical aspects lower mean values for Pressure Pain Threshold and higher means for Pain to Palpation in volunteers with TMD, both indicators of higher levels of pain, and lower mean frenulum values of the left masseter muscle in the group with temporomandibular dysfunction.
Therefore, the objective of this study is to compare the electrical activity of masseter muscles bilaterally according to the presence or absence of TDM in college students with high degree of anxiety.
After completing the questionnaires, the volunteers were submitted to electromyographic evaluation of the surface of the right and left masseter muscles.
The treatment of masseter
hypertrophy with botulinum toxin type A.
On the basis of previous studies that demonstrated predictable differences in muscle stiffness for contracted versus relaxed musculature, investigators evaluated orofacial muscle stiffness in the masseter, cheek, and tongue.
Each structure was assessed in the relaxed followed by the contracted state in this order: tongue, cheek, masseter; left then right sides.
EMG 2 included three EMG sensors placed on the jaw to record muscle tension in the masseter muscle (bilaterally).
A comparison was done of the mean difference between S1 (first silence condition) and M1 (first music condition) as well as between M1 (first music condition) and M2 (second music condition) for the masseter muscles.
Em 2003, foi realizado um estudo  sobre a espessura, resistencia e inducao de dor no musculo masseter, em individuos com diferentes tipos de morfologia craniofacial.
Quinze homens e 13 mulheres, com idade media de 24 anos, realizaram protocolo de inducao da fadiga muscular (mastigacao de goma de mascar por seis minutos), seguido de injecao de SH e salina isotonica (SI) no masseter esquerdo, com intervalo de 45 minutos entre elas.