• Cinara Maria Camparis, Gilberto Formigoni, Manoel Jacobsen Teixeira, Lia Rita Azeredo Bittencourt, Sérgio Tufik, and José Tadeu Tesseroli de Siqueira.
• Araraquara School of Dentistry, São Paulo State University (UNESP), Brazil. cinara@foar.unesp.br
• Arch. Oral Biol. 2006 Sep 1;51(9):721-8.

ObjectiveTo seek better understanding of chronic musculoskeletal facial pain and its relation to sleep bruxism, by comparing patients with sleep bruxism, with and without temporomandibular disorder.DesignForty sleep bruxism patients were evaluated according to the Research Diagnostic Criteria for Temporomandibular Disorders: group A-20 patients with myofascial pain, 3 men, 17 women; average age 32.7yr; mean duration of pain 4.37yr; group B-20 without myofascial pain, 5 men, 15 women; average age 30.8yr. Sleep and bruxism were evaluated in one-night polysomnography.ResultsThere were no statistically significant differences for bruxism and sleep variables of the two groups: number of bursts and bruxism episodes per hour, amplitude and duration of bruxism episodes, sleep efficiency and latency, percentage of non-REM and REM sleep, respiratory events, periodic limb movements, and micro-arousals.ConclusionsThe polysomnographic characteristics of patients with sleep bruxism, with and without orofacial pain, are similar. More studies are necessary to clarify the reasons why some sleep bruxism patients develop chronic myofascial pain, and others do not.

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