title: Effect of malocclusion severity on oral health-related quality of life and food intake ability in a Korean population.
abstract: BACKGROUND
  The aim of this study was to evaluate the effect of malocclusion severity on oral health-related quality of life and food intake ability in adult patients, controlling for sex, age, and the type of dental clinic visited.
  
  
  METHODS
  The sample consisted of 472 Korean patients (156 male, 316 female) with a mean age of 21.1 (SD, 8.6) years in a dental hospital and a private clinic. The correlations between the Korean version of the Oral Health Impact Profile-14 (OHIP-14K), subjective food intake ability (FIA) for 5 key foods, and Index of Orthodontic Treatment Need-Dental Health Component (IOTN-DHC) were investigated.
  
  
  RESULTS
  The mean IOTN-DHC and OHIP-14K scores were significantly higher for the dental hospital patients than for the private clinic patients (IOTN-DHC, P <0.001; OHIP-14K, P <0.05). Malocclusion severity was significantly higher in male than in female subjects (P <0.001). Older patients perceived their oral health-related quality of life more negatively than did the teens (P <0.001). As the severity of the malocclusion increased, oral health-related quality of life and masticatory function worsened (OHIP-14K, P <0.001; FIA, P <0.05).
  
  
  CONCLUSIONS
  As the severity of the malocclusion and the age of the patients increased, oral health-related quality of life and masticatory function relatively deteriorated. This finding provides evidence that severe malocclusions are associated with lower quality of life and less masticatory efficiency in older patients.
authors.affiliation: Fellow, Department of Orthodontics, The Institute of Cranial-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Choi
authors.affiliation: Private practice, Seongnam, Korea.
authors.forename: Jung-Suk
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Associate professor, Department of Orthodontics, The Institute of Cranial-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Jung-Yul
authors.initials: JY
authors.lastname: Cha
authors.affiliation: Professor, Department of Orthodontics, The Institute of Cranial-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea. Electronic address: hwang@yuhs.ac.
authors.forename: Chung-Ju
authors.initials: CJ
authors.lastname: Hwang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000848:Anodontia / Q000503:physiopathology / Q000523:psychology; D001294:Attitude to Health; D002971:Cleft Lip / Q000503:physiopathology / Q000523:psychology; D002972:Cleft Palate / Q000503:physiopathology / Q000523:psychology; D003430:Cross-Sectional Studies; D003740:Dental Clinics; D003796:Dental Service, Hospital; D004435:Eating / Q000502:physiology*; D005260:Female; D006801:Humans; D061326:Index of Orthodontic Treatment Need; D008297:Male; D008310:Malocclusion / Q000145:classification* / Q000503:physiopathology / Q000523:psychology; D008312:Malocclusion, Angle Class II / Q000503:physiopathology / Q000523:psychology; D008313:Malocclusion, Angle Class III / Q000503:physiopathology / Q000523:psychology; D008409:Mastication / Q000502:physiology; D024343:Open Bite / Q000503:physiopathology / Q000523:psychology; D009909:Oral Health; D057887:Overbite / Q000503:physiopathology / Q000523:psychology; D011788:Quality of Life; D012737:Sex Factors; D013315:Stress, Psychological / Q000503:physiopathology / Q000523:psychology; D014095:Tooth, Impacted / Q000503:physiopathology / Q000523:psychology; D055815:Young Adult