title: The prevalence of facial asymmetry in the dentofacial deformities population at the University of North Carolina.
abstract: In a retrospective survey of 1,460 patients evaluated in the Dentofacial Clinic at the University of North Carolina, 495 (34%) were found to have clinically apparent facial asymmetry. When present, asymmetry affected the upper face in only 5% (n = 23), the midface (primarily the nose) in 36% (n = 178), and the chin in 74% (n = 365). The occlusal plane was canted, indicating vertical asymmetry, in 41% (n = 201). Patients with Class II problems, whether or not due to mandibular deficiency, had a 28% prevalence of asymmetry; those with other types of problems (e.g., Class III, long face, Class I) had a 40% prevalence, which is significantly higher than those with Class II occlusions. When the chin deviated transversely, there was an 80% chance that the deviation was to the left. Only in patients with long face was there an equal distribution of left-right chin asymmetry. In the other groups, the prevalence of deviation of the chin to the left approached 90%. These findings are meaningful for clinicians because asymmetry must be identified and planned for prior to initiating treatment.
authors.affiliation: Department of Orthodontics, University of North Carolina, School of Dentistry, Chapel Hill 27599-7450, USA.
authors.forename: T R
authors.initials: TR
authors.lastname: Severt
authors.forename: W R
authors.initials: WR
authors.lastname: Proffit
mesh_terms: D005145:Face / Q000002:abnormalities*; D005146:Facial Asymmetry / Q000453:epidemiology*; D006801:Humans; D008310:Malocclusion / Q000453:epidemiology; D009657:North Carolina / Q000453:epidemiology; D015995:Prevalence; D012189:Retrospective Studies; D014071:Tooth Abnormalities / Q000453:epidemiology*