title: Tooth-wear patterns in adolescents with normal occlusion and Class II Division 2 malocclusion.
abstract: BACKGROUND
  In this study, we investigated tooth-wear patterns in adolescents with either normal occlusion or Class II Division 2 malocclusion.
  
  
  METHODS
  The sample consisted of dental casts from 165 subjects that were divided into 2 groups: 115 normal occlusion subjects (mean age, 14.3 years) and 50 complete Class II Division 2 subjects (mean age, 13.9 years). Dental wear was assessed by using a modified version of the tooth wear index. The 2 groups were compared with the Mann-Whitney test for the frequency and severity of wear on each surface of each group of teeth. The level of statistical significance was set at 5%.
  
  
  RESULTS
  The normal occlusion group statistically had greater tooth wear on the incisal surfaces of the maxillary lateral incisors and the incisal surfaces of the maxillary canines than did the Class II Division 2 malocclusion group. The malocclusion group showed statistically greater tooth wear on the labial surfaces of the mandibular lateral incisors, the occlusal surfaces of the maxillary premolars and first molars, the occlusal surfaces of the mandibular premolars, the palatal surfaces of the maxillary second premolars, and the buccal surfaces of the mandibular premolars and first molars than did the normal occlusion group.
  
  
  CONCLUSIONS
  Subjects with normal occlusion and those with complete Class II Division 2 malocclusions have different tooth-wear patterns. Tooth wear on the malocclusion subjects should not be considered pathologic but, rather, the consequence of different interocclusal arrangements.
authors.affiliation: Department of Orthodontics, University of North Paraná, Londrina, Brazil. pvoltramari@hotmail.com
authors.forename: Paula Vanessa Pedron
authors.initials: PV
authors.lastname: Oltramari-Navarro
authors.forename: Guilherme
authors.initials: G
authors.lastname: Janson
authors.forename: Renata Biella Salles
authors.initials: RB
authors.lastname: de Oliveira
authors.forename: Camila Leite
authors.initials: CL
authors.lastname: Quaglio
authors.forename: José Fernando
authors.initials: JF
authors.lastname: Castanha Henriques
authors.forename: Sílvia Helena
authors.initials: SH
authors.lastname: de Carvalho Sales-Peres
authors.forename: James A
authors.initials: JA
authors.lastname: McNamara
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000150:complications / Q000473:pathology*; D003765:Models, Dental; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D057085:Tooth Wear / Q000150:complications / Q000473:pathology*