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Volume 10 No. 03
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Accepted Papers

Scientific Investigations

Effects of Botulinum Toxin on Jaw Motor Events during Sleep in Sleep Bruxism Patients: A Polysomnographic Evaluation

Young Joo Shim, D.D.S, M.S.D.1; Moon Kyu Lee, M.D., Ph.D.2; Takafumi Kato, D.D.S., Ph.D.3; Hyung Uk Park, D.D.S., M.S.D.4; Kyoung Heo, M.D., Ph.D.5; Seong Taek Kim, D.D.S., Ph.D.6
1Department of Orofacial Pain and Oral Medicine, Daejeon Dental Hospital, College of Dentistry, Wonkwang University, Daejeon, Korea; 2Department of Neurology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea; 3Department of Oral Anatomy and Neurobiology, Osaka University Graduate School of Dentistry, Osaka, Japan; 4Department of Dentistry, Korea Army Training Center District Hospital, Nonsan, Korea; 5Department of Neurology, Yonsei University College of Medicine, Seoul, Korea; 6Department of Orofacial Pain and Oral Medicine, Yonsei University College of Dentistry, Seoul, Korea

Study Objectives:

To investigate the effects of botulinum toxin type A (BoNT-A) injection on jaw motor episodes during sleep in patients with or without orofacial pain who did not respond to oral splint treatment.


Twenty subjects with a clinical diagnosis of SB completed this study. Ten subjects received bilateral BoNT-A injections (25 U per muscle) into the masseter muscles only (group A), and the other 10 received the injections into both the masseter and temporalis muscles (group B). Video-polysomnographic (vPSG) recordings were made before and at 4 weeks after injection. Rhythmic masticatory muscle activity (RMMA) and orofacial activity (OFA) were scored and analyzed for several parameters (e.g., frequency of episodes, bursts per episode, episode duration). The peak amplitude of electromyographic (EMG) activity in the two muscles was also measured.


BoNT-A injection did not reduce the frequency, number of bursts, or duration for RMMA episodes in the two groups. The injection decreased the peak amplitude of EMG burst of RMMA episodes in the injected muscles (p < 0.001, repeated measure ANOVA) in both groups. At 4 weeks after injection, 9 subjects self-reported reduction of tooth grinding and 18 subjects self-reported reduction of morning jaw stiffness.


A single BoNT-A injection is an effective strategy for controlling SB for at least a month. It reduces the intensity rather than the generation of the contraction in jaw-closing muscles. Future investigations on the efficacy and safety in larger samples over a longer follow-up period are needed before establishing management strategies for SB with BoNT-A.


Shim YJ; Lee MK; Kato T; Park HU; Heo K; Kim ST. Effects of botulinum toxin on jaw motor events during sleep in sleep bruxism patients: a polysomnographic evaluation. J Clin Sleep Med 2014;10(3):291-298.

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