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Journal of Dental Research
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Clinical

Effect of Occlusal Interference on Habitual Activity of Human Masseter

A. Michelotti1,*, M. Farella1, L.M. Gallo2, A. Veltri1, S. Palla2 and R. Martina1

1 Department of Dental and Maxillo-Facial Sciences, Section of Orthodontics and Clinical Gnathology, School of Dentistry, University of Naples "Federico II", Via Pansini, 5.I-80131, Italy; and
2 Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zürich, Switzerland;

Correspondence: * corresponding author, michelot{at}unina.it

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.

Key Words: electromyography • masseter muscle • occlusal interference • temporomandibular disorders

Journal of Dental Research, Vol. 84, No. 7, 644-648 (2005)
DOI: 10.1177/154405910508400712
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