الفهرس 
Impact of electromyography biofeedback on pain and functional outcome in patients with bruxism
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Abstract
Background: Bruxism is a movement disorder affecting the masticatory muscles characterized by hyperactivity leading to pain and disability. The use of the electromyography biofeedback training widely used in the management of such cases. Purpose: This study aimed to determine the effectiveness of electromyography biofeedback training on myofascial pain and functional outcomes in patients with bruxism. Study design: This is a randomized control trial. Materials and methods: Thirty patients with definite bruxism of both genders were allocated in this study. their mean & SD of age 23 ± 4.8 years. The patients had been diagnosed and referred prior to the study from the Dental clinic in Misr University for science and technology (MUST). This study took place in the electromyography research lab of the collage of physical therapy in MUST University.The patients had been divided randomly into two groups; group A (received the nonsteroidal anti-inflammatory drugs prescribed by oral surgeon), and group B (treated with electromyography biofeedback training in addition to the same medical treatment). The pain was assessed pre- and post- treatment using Visual analogue scale, the muscle tenderness by digital palpating scale, the frequency of clenching by bruxism clenching frequency scale and the maximum mouth opening by the digital caliper.Results: The statistical analysis showed that in group B there was an extremely significant difference between the before and after treatment (p=0.001) in pain. However, in group A (p=0.008). In tendernessThere was no statistically significant difference between pre- and post-study mean values of muscle tenderness in group A, p-value was (0.157). While there was statistically extremely significant difference between pre- and post-study mean values of muscle tenderness in group B as p-value was (0.001). In clenching frequency there was no statistically significant difference between pre- and post-study