title: An oral appliance with or without elastic bands to control mouth opening during sleep-a randomized pilot study.
abstract: BACKGROUND
  Oral appliances (OAs) hold the lower jaw forward to reduce obstructive sleep apneas. Some OA designs allow mouth opening, which influences the forward positioning of the lower jaw. The aim of this pilot study was to compare the efficacy of an adjustable, custom-made OA (Narval®) in its original design, which allowed mouth opening, with the same OA with elastic bands that restricted mouth opening.
  
  
  METHODS
  Consecutive patients with an apnea-hypopnea index (AHI) of ≥15 were randomized to start with an OA either with or without elastic bands in a single-blinded, crossover, pilot study. The patients underwent acclimatization and titration. After 3 weeks use of each device, they had renewed sleep apnea recordings and responded to questionnaires. Washout periods took place between the tests.
  
  
  RESULTS
  Ten subjects with a median AHI of 19.7 (interquartile range (IQR) 17.3 to 31.8) were included. The AHI decreased to 3.1 (IQR 1.5-14.7) (p < 0.01) with the OA and to 5.1 (IQR 2.4-14.3) (p < 0.01) with the OA with elastic bands, with no difference between them (p = 0.7). The two subjects with severe obstructive sleep apnea (OSA) almost halved their supine AHI with, as compared to without, elastic bands. The majority of the patients preferred to use the elastic bands.
  
  
  CONCLUSIONS
  This pilot study indicates that elastic bands markedly reduced the supine AHI in two subjects with severe sleep apnea as compared to without elastic bands. The majority of the patients preferred the use of elastic bands, although no significant difference in the AHI was observed with versus without the elastic bands in the whole sample.
authors.affiliation: Department of Orthodontics, Umeå University, SE-901 87, Umeå, Sweden.
authors.forename: Niclas
authors.initials: N
authors.lastname: Norrhem
authors.affiliation: Department of Orthodontics, Umeå University, SE-901 87, Umeå, Sweden. marie.marklund@odont.umu.se.
authors.forename: Marie
authors.initials: M
authors.lastname: Marklund
mesh_terms: D000328:Adult; D000368:Aged; D018592:Cross-Over Studies; D005260:Female; D006801:Humans; D008297:Male; D019186:Mandibular Advancement / Q000295:instrumentation*; D008875:Middle Aged; D016382:Orthodontic Appliance Design; D010865:Pilot Projects; D017286:Polysomnography; D016037:Single-Blind Method; D020181:Sleep Apnea, Obstructive / Q000628:therapy*
keywords: Efficacy; Mouth opening; Obstructive sleep apnea; Oral appliance design; Randomized
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