title: The association between anterior crossbite, deep bite and temporomandibular joint morphology validated by magnetic resonance imaging in an adult non-patient group.
abstract: The aim of this study was to determine whether associations exist between anterior edge-to-edge bite, anterior crossbite, deep bite and morphology of the temporomandibular joint (TMJ) in the vertical dimension, evaluated by magnetic resonance imaging (MRI) in adults. A total of 148 subjects (90 females, 58 males) were selected from the cross-sectional epidemiological population-based study "Study of Health in Pomerania" (SHIP) for this evaluation. In each person a clinical orthodontical examination was performed. Four linear measurements and one ratio from MRI scans of the TMJs were evaluated. To estimate the effects of anterior edge-to-edge bite, anterior crossbite and deep bite on TMJ variables, linear regression was applied. (Analyses were adjusted for sex, age, school education, and orthodontic treatment.) Anterior edge-to-edge-bite/crossbite had shorter mean eminence heights (eh) on both joint sides (p<0.01). In deep bite without gingival contact the postglenoid process height (pgph) decreased significantly in left joints (p=0.018) and there was a tendency to a decrease in right joints (p=0.059). The ratio between eminence height and postglenoid process height (eh/pgph) was increased on both left (p<0.001) and right (p=0.002) joints. In conclusion, anterior edge-to-edge-bite/crossbite is connected to a reduced eminence height and deep bite without gingival contact with an increased ratio between eminence height and postglenoid process height. Therefore the condylar path in the anterior edge-to-edge bite and crossbite cases can be interpreted to be reduced and in the deep bite cases without gingival contact to be steepened.
authors.affiliation: Department of Restorative Dentistry, Periodontology and Endodontology, Center of Oral Health, University of Greifswald, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Wohlberg
authors.forename: C
authors.initials: C
authors.lastname: Schwahn
authors.forename: D
authors.initials: D
authors.lastname: Gesch
authors.forename: G
authors.initials: G
authors.lastname: Meyer
authors.forename: T
authors.initials: T
authors.lastname: Kocher
authors.forename: O
authors.initials: O
authors.lastname: Bernhardt
mesh_terms: D000328:Adult; D000368:Aged; D015897:Comorbidity; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data*; D008297:Male; D008310:Malocclusion / Q000453:epidemiology* / Q000473:pathology*; D008875:Middle Aged; D057887:Overbite / Q000453:epidemiology* / Q000473:pathology*; D015995:Prevalence; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013223:Statistics as Topic; D013704:Temporomandibular Joint / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000453:epidemiology* / Q000473:pathology*