title: Association of functional malocclusion with temporomandibular disorders in orthodontic patients prior to treatment.
abstract: The purpose of this study was to investigate the role of functional malocclusion in temporomandibular disorders (TMD) in untreated orthodontic patients. A total of 508 orthodontic patients were enrolled. All patients were evaluated for the presence of various types of functional malocclusion and clinical signs of TMD before treatment. The chi-square test was used to evaluate the association of functional malocclusion and TMD. The frequencies of TMD were 44.2% in patients with retruded position (RP) interference and 38.1% in those without such interference (p > 0.05). The frequency of TMD in patients with protrusive interference was greater than those without (32.2% vs. 18.4%; p < 0.005). Patients with balancing interference had a significantly higher frequency of TMD than those without (49.2% vs. 23.9%; p < 0.0001). We thus conclude that patients with functional malocclusion of balancing or protrusive interference type have an increased risk for developing TMD.
authors.affiliation: College of Medicine, National Cheng Kung University, Tainan, Taiwan, R.O.C. jkliu@mail.ncku.edu.tw
authors.forename: J K
authors.initials: JK
authors.lastname: Liu
authors.forename: M Y
authors.initials: MY
authors.lastname: Tsai
mesh_terms: D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000150:complications*; D008875:Middle Aged; D012307:Risk Factors; D013624:Taiwan; D013705:Temporomandibular Joint Disorders / Q000209:etiology*