Cranio : the journal of craniomandibular practice · 2017
Are the bite force and electromyographic activity altered in muscle TMD patients with abfraction lesions?
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da Silva Ana Maria Bettoni Rodrigues, Valencise Magri Laís, da Silva Marco Antônio Moreira Rodrigues, Sousa Neto Manoel Damião de
Аннотация
OBJECTIVE: To verify if the maximal molar bite force (BF) and the electromyographic activity (EMG) are altered in TMD patients with abfraction lesions (AL) when compared to those without AL.
METHODS: The sample was composed of 45 patients (18-60 years old), 30 diagnosed with TMD (RDC/TMD) (15 with AL and 15 without AL) and 15 controls. The BF and the EMG of the masticatory muscles (maximal voluntary contraction (MVC) and chewing gum) were measured.
RESULTS: TMD patients showed decreased BF (p < 0.001), without differences between patients with and without AL. The electromyographic activity during MVC was similar among all groups (p > 0.05), although there was a greater trend of muscular balance for the control group (percentage overlapping coefficient and electromyographic indexes). The TMD group without AL showed a lower number of cycles and masticatory frequency.
DISCUSSION: TMD patients with and without AL exhibited similar results in the analysis of the BF and EMG, without differences.
METHODS: The sample was composed of 45 patients (18-60 years old), 30 diagnosed with TMD (RDC/TMD) (15 with AL and 15 without AL) and 15 controls. The BF and the EMG of the masticatory muscles (maximal voluntary contraction (MVC) and chewing gum) were measured.
RESULTS: TMD patients showed decreased BF (p < 0.001), without differences between patients with and without AL. The electromyographic activity during MVC was similar among all groups (p > 0.05), although there was a greater trend of muscular balance for the control group (percentage overlapping coefficient and electromyographic indexes). The TMD group without AL showed a lower number of cycles and masticatory frequency.
DISCUSSION: TMD patients with and without AL exhibited similar results in the analysis of the BF and EMG, without differences.