4.3 Article

Phasic jaw motor episodes in healthy subjects with or without clinical signs and symptoms of sleep bruxism: a pilot study

Journal

SLEEP AND BREATHING
Volume 18, Issue 1, Pages 187-193

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11325-013-0868-6

Keywords

Sleep bruxism; Polysomnography; Rhythmic masticatory muscle activity; Clinical signs and symptoms

Funding

  1. Grants-in-Aid for Scientific Research [25463017] Funding Source: KAKEN

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Background To investigate the association between each clinical diagnosis criterion for sleep bruxism (SB) and the frequency of jaw motor events during sleep. Methods Video-polysomnography was performed on 17 healthy adult subjects (mean age, 26.7 +/- 2.8 years), with at least one of the following clinical signs and symptoms of SB: (1) a report of frequent tooth grinding, (2) tooth attrition with dentine exposure through at least three occlusal surfaces, (3) morning masticatory muscle symptoms, and (4) masseter muscle hypertrophy. Episodes of rhythmicmasticatorymuscle activity (RMMA) and isolated tonic activity were scored visually. These variables were compared with regards to the presence or absence of each clinical sign and symptom. Results In 17 subjects, 4.0 +/- 2.5/h (0.1-10.2) RMMA and 1.0 +/- 0.8/h (0-2.4) isolated tonic episodes were observed (total episodes: 5.0 +/- 2.4/h (1.2-11.6)). Subjects with self-reported grinding sounds (n = 7) exhibited significantly higher numbers of RMMA episodes (5.7 +/- 2.3/h) than those without (n = 10; 2.8 +/- 1.8/h) (p = 0.011). Similarly, subjects with tooth attrition (n = 6) showed significantly higher number of RMMA episodes (5.6 +/- 3.1/h) than those without (n= 11; 3.2 +/- 1.6/h) (p = 0.049). The occurrence of RMMA did not differ between the presence and absence of morning masticatory muscle symptoms or muscle hypertrophy. Conclusions Clinical signs and symptoms frequently used for diagnosing SB can represent different clinical and physiological aspects of jaw motor activity during sleep.

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