Effect of a nociceptive trigeminal inhibitory splint on electromyographic activity in jaw closing muscles during sleep

J Oral Rehabil. 2007 Feb;34(2):105-11. doi: 10.1111/j.1365-2842.2006.01717.x.


The nociceptive trigeminal inhibitory (NTI) splint has been claimed to decrease the electromyographic (EMG) activity of jaw-closing muscles and relieve symptoms of various types of temporomandibular disorders (TMD) and bruxism. The present study was designed to address the question about EMG-changes during sleep. Ten patients (age: 23-39 years) with a self-report of tooth-grinding during sleep were recruited. Patients were examined at baseline and after each treatment period with the use of the Research Diagnostic Criteria for TMD. A portable EMG-device was used to record EMG-activity from the masseter muscle during sleep. The patients received two 2-week splint treatments in a randomized cross-over fashion; an NTI splint and a standard flat occlusal splint (OS). EMG data were analysed according to published criteria. Using a 10% of maximum clenching EMG-activity cut-off threshold to determine the number of EMG-events h(-1) of sleep, the NTI splint was associated with a significant reduction (9.2 +/- 3.2 events h(-1)) compared with baseline EMG (19.3 +/- 4.0; anova: P = 0.004, Tukey post hoc: P = 0.006), whereas there were no differences between the OS (16.2 +/- 4.7) and baseline EMG (19.2 +/- 4.1; P = 0.716). There were no effects of either NTI or OS on clinical outcome measures (anovas: P > 0.194). This short-term study indicated a strong inhibitory effect on EMG-activity in jaw closing muscles during sleep of the NTI, but not the OS. However, the EMG-activity was not directly related to clinical outcome. Further studies will be needed to determine long-term effects and possible side effects of the NTI splint.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Cross-Over Studies
  • Denmark
  • Electromyography
  • Equipment Design
  • Facial Pain / physiopathology
  • Facial Pain / prevention & control*
  • Female
  • Humans
  • Male
  • Masseter Muscle / physiopathology
  • Motor Activity*
  • Occlusal Splints
  • Sleep Bruxism / physiopathology
  • Sleep Bruxism / therapy*
  • Splints*
  • Temporomandibular Joint Disorders / physiopathology
  • Temporomandibular Joint Disorders / prevention & control*
  • Treatment Outcome