title: Periodontal and dental effects of surgically assisted rapid maxillary expansion, assessed by using digital study models.
abstract: OBJECTIVE
  The present study assessed the maxillary dental arch changes produced by surgically assisted rapid maxillary expansion (SARME).
  
  
  METHODS
  Dental casts from 18 patients (mean age of 23.3 years) were obtained at treatment onset (T1), three months after SARME (T2) and 6 months after expansion (T3). The casts were scanned in a 3D scanner (D-250, 3Shape, Copenhagen, Denmark). Maxillary dental arch width, dental crown tipping and height were measured and assessed by ANOVA and Tukey's test.
  
  
  RESULTS
  Increased transversal widths from T1 and T2 and the maintenance of these values from T2 and T3 were observed. Buccal teeth tipping also showed statistically significant differences, with an increase in all teeth from T1 to T2 and a decrease from T2 to T3. No statistically significant difference was found for dental crown height, except for left first and second molars, although clinically irrelevant.
  
  
  CONCLUSIONS
  SARME proved to be an effective and stable procedure, with minimum periodontal hazards.
authors.affiliation: Sociedade Paulista de Ortodontia, Botucatu, São Paulo, Brazil.
authors.forename: Danilo Furquim
authors.initials: DF
authors.lastname: Siqueira
authors.affiliation: Universidade Sagrado Coração, Bauru, São Paulo, Brazil.
authors.forename: Mauricio de Almeida
authors.initials: Mde A
authors.lastname: Cardoso
authors.affiliation: Universidade Sagrado Coração, Bauru, São Paulo, Brazil.
authors.forename: Leopoldino
authors.initials: L
authors.lastname: Capelozza Filho
authors.affiliation: Department of Surgery, School of Medicine, Universidade de São Paulo, São Paulo, São Paulo, Brazil.
authors.forename: Dov Charles
authors.initials: DC
authors.lastname: Goldenberg
authors.affiliation: Universidade de São Paulo, São Bernardo do Campo, São Paulo, Brazil.
authors.forename: Mariana dos Santos
authors.initials: Mdos S
authors.lastname: Fernandes
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000033:anatomy & histology; D003481:Cuspid / Q000033:anatomy & histology; D003724:Dental Arch / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008437:Maxilla / Q000601:surgery*; D003765:Models, Dental; D008963:Molar / Q000033:anatomy & histology; D061848:Optical Imaging / Q000379:methods; D019340:Osteotomy, Le Fort / Q000379:methods*; D010155:Palatal Expansion Technique / Q000295:instrumentation; D010519:Periodontium / Q000033:anatomy & histology*; D012189:Retrospective Studies; D014070:Tooth / Q000033:anatomy & histology*; D019228:Tooth Crown / Q000033:anatomy & histology; D055815:Young Adult