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Quintessence Publishing: Journals: OFPH
Journal of Oral & Facial Pain and Headache

Edited by Barry J. Sessle, BDS, MDS, BSc, PhD, FRSC

Official Journal of the American Academy of Orofacial Pain,
the European, Asian, and Ibero-Latin Academies of Craniomandibular
Disorders, and the Australian Academy of Orofacial Pain

ISSN 2333-0384 (print) • ISSN 2333-0376 (online)

Publication:
Spring 1998
Volume 12 , Issue 2

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Effect of Parafunctional Clenching on TMD Pain

Glaros/Tabacchi/Glass

Pages: 145-152
PMID: 9656892

Parafunctional activities are assumed to play an important role in temporomandibular disorders (TMD), but experimental data in support of this hypothesis are lacking. This study examined the role of parafunctional clench ing on various measures of TMD pain. Five subjects participated in daily 17-minute electromyogram biofeedback training session structured in three phases. Subjects were instructed to maintain temporalis and masseter muscle activity below 2 uV in the first (decrease) phase of training (10 sessions), above 10 uV in the second (increase) phase (1 to 8 sessions), and below 2 uV in the third (decrease) phase (10 to 15 sessions). Preliminary screening examinations showed that none of the subjects had TMD. Two subjects reported intolerable pain during increase training, and both were diagnosed with a TMD during this phase. No subject was diagnosed with TMD pain during either decrease training phase. The authors conclude that chronic, low-level parafunctional clenching may be a factor in the cause of TMD pain.

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