title: The post-orthodontic prevalence of temporomandibular disorder and functional occlusion contacts in surgical and non-surgical cases.
abstract: This study aimed to assess mandibular mobility and the prevalence of functional occlusal contacts in subjects treated to a Class 1 incisor relationship by fixed orthodontic appliance therapy. Two hundred and thirty subjects participated (mean age=18 years) of whom 42 underwent orthognathic surgery. All subjects were in retention with a mean time of 7 months between debond and examination. Maximal mandibular opening, lateral and protrusive excursions were all significantly reduced in the surgical cases compared to the non-surgical group. Centric and eccentric non-ideal occlusal contacts were not different between surgical and non-surgical groups. Non-working side contacts occurred in 30% of subjects, posterior contacts on protrusion in 20% and RCP-ICP prematurities in 18% of subjects. Non-working side contacts were significantly more frequent in post-graduate cases compared to staff cases (P<0.05). An overbite less than the mean of 2.4 mm resulted in a reduced likelihood of canine guidance on the working side (P<0.001) and an increased frequency of non-working side contacts and posterior contacts on protrusion (P<0.001).
authors.affiliation: Department of Clinical Dental Sciences, Academic Unit of Restorative Dentistry, University of Liverpool, Liverpool, U.K. a.milosevic@liv.ac.uk
authors.forename: A
authors.initials: A
authors.lastname: Milosevic
authors.forename: R H
authors.initials: RH
authors.lastname: Samuels
mesh_terms: D000293:Adolescent; D016009:Chi-Square Distribution; D003481:Cuspid / Q000502:physiology; D003766:Dental Occlusion; D003767:Dental Occlusion, Balanced; D003768:Dental Occlusion, Centric; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000601:surgery* / Q000628:therapy; D008334:Mandible / Q000503:physiopathology; D015588:Observer Variation; D009967:Orthodontic Appliances; D018704:Orthodontic Retainers; D009971:Orthodontics, Corrective / Q000009:adverse effects; D015995:Prevalence; D013705:Temporomandibular Joint Disorders / Q000209:etiology* / Q000503:physiopathology; D014070:Tooth / Q000033:anatomy & histology* / Q000502:physiology