Association of functional malocclusion with temporomandibular disorders in orthodontic patients prior to treatment.
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.
Liu
J K
JK
College of Medicine, National Cheng Kung University, Tainan, Taiwan, R.O.C. jkliu@mail.ncku.edu.tw
Tsai
M Y
MY
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*