Journal
JOURNAL OF DENTAL RESEARCH
Volume 84, Issue 7, Pages 644-648Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/154405910508400712
Keywords
electromyography; masseter muscle; occlusal interference; temporomandibular disorders
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It has been suggested that occlusal interference may increase habitual activity in the jaw muscles and may lead to temporomandibular disorders ( TMD). We tested these hypotheses by means of a double- blind randomized crossover experiment carried out on 11 young healthy females. Strips of gold foil were glued either on a selected occlusal contact area ( active interference) or on the vestibular surface of the same tooth ( dummy interference) and left for 8 days each. Electromyographic masseter activity was recorded in the natural environment by portable recorders under interference- free, dummy- interference, and active- interference conditions. The active occlusal interference caused a significant reduction in the number of activity periods per hour and in their mean amplitude. The EMG activity did not change significantly during the dummy- interference condition. None of the subjects developed signs and/ or symptoms of TMD throughout the whole study, and most of them adapted fairly well to the occlusal disturbance.
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