title: An orthodontic oral appliance.
abstract: OBJECTIVE
  This pilot study was performed to test the hypothesis that an orthodontic oral appliance (OA) that is designed to work against the backwardly directed forces on the upper incisors may counteract the reduction in overjet from these devices.
  
  
  METHODS
  Thirty patients with normal bites, good oral health, and milder sleep apnea were randomized to treatment with either OAs or orthodontic OAs. Bite changes were evaluated on plaster casts and radiographs and by questionnaires after a mean of 2.4 years in 19 frequent users.
  
  
  RESULTS
  Four of nine patients in the orthodontic OA group increased their overjet by > or =0.4 mm, while none of the 10 patients in the OA group experienced that effect.
  
  
  CONCLUSIONS
  Only the orthodontic OA increases the overjet; this design may therefore be beneficial to patients at risk of negative effects on their bite during OA treatment.
authors.affiliation: Department of Orthodontics, Umeå University, Umeå, Sweden. Marie.Marklund@odont.umu.se
authors.forename: Marie
authors.initials: M
authors.lastname: Marklund
authors.forename: Per Erik
authors.initials: PE
authors.lastname: Legrell
mesh_terms: D002508:Cephalometry; D005260:Female; D006801:Humans; D007180:Incisor / Q000503:physiopathology; D008297:Male; D017090:Occlusal Splints / Q000009:adverse effects*; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D057887:Overbite / Q000209:etiology*; D010865:Pilot Projects; D020181:Sleep Apnea, Obstructive / Q000628:therapy*; D012913:Snoring / Q000628:therapy; D011795:Surveys and Questionnaires