title: Dental arch dimensions in the mixed dentition: a study of Brazilian children from 9 to 12 years of age.
abstract: OBJECTIVE
  This study evaluated dental arch dimensional changes of Brazilian children.
  
  
  METHODS
  Dental casts were taken from 66 children (29 males; 37 females) with normal occlusion selected among 1,687 students from public and private schools aged 9, 10, 11 and 12 years, according to the following criteria: Class I canine and molar relationships; well-aligned upper and lower dental arches; mixed dentition; good facial symmetry; no previous orthodontic treatment. Dental arch dimensions were taken by one examiner using the Korkhaus' compass and a digital pachymeter. ANOVA test was applied to compare the arch dimensions at the different ages and the t-test was used to compare the arch dimensions of male and female subjects. Arch forms were compared by means of chi-square tests.
  
  
  RESULTS
  Only the maxillary anterior segment length showed a statistically significant increase from 10 to 12 years of age. Males had a significantly larger maxillary depth than females at the age range evaluated. The predominant dental arch form found was elliptical.
  
  
  CONCLUSIONS
  In the studied age range, anterior maxillary length increased from 10 to 12 years of age, males had larger maxillary depth than females and the predominant arch form was elliptical.
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil. fablouly@terra.com.br
authors.forename: Fabiane
authors.initials: F
authors.lastname: Louly
authors.forename: Paulo Roberto Aranha
authors.initials: PR
authors.lastname: Nouer
authors.forename: Guilherme
authors.initials: G
authors.lastname: Janson
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Pinzan
mesh_terms: D000367:Age Factors; D000704:Analysis of Variance; D001938:Brazil; D016009:Chi-Square Distribution; D002648:Child; D003724:Dental Arch / Q000033:anatomy & histology / Q000254:growth & development*; D003818:Dentition, Mixed; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000033:anatomy & histology / Q000254:growth & development; D008437:Maxilla / Q000033:anatomy & histology / Q000254:growth & development; D009811:Odontometry; D009929:Organ Size; D012727:Sex Characteristics; D012737:Sex Factors