title: Dental models made with an intraoral scanner: a validation study.
abstract: BACKGROUND
  Our objectives were to determine the validity and reproducibility of measurements on stereolithographic models and 3-dimensional digital dental models made with an intraoral scanner.
  
  
  METHODS
  Ten dry human skulls were scanned; from the scans, stereolithographic models and digital models were made. Two observers measured transversal distances, mesiodistal tooth widths, and arch segments on the skulls and the stereolithographic and digital models. All measurements were repeated 4 times. Arch length discrepancy and tooth size discrepancy were calculated. Statistical analysis was performed by using paired t tests.
  
  
  RESULTS
  For the measurements on the stereolithographic and digital models, statistically significant differences were found. However, these differences were considered to be clinically insignificant. Digital models had fewer statistically significant differences and generally the smallest duplicate measurement errors compared with the stereolithographic models.
  
  
  CONCLUSIONS
  Stereolithographic and digital models made with an intraoral scanner are a valid and reproducible method for measuring distances in a dentition.
authors.affiliation: Department of Orthodontics and Craniofacial Biology, Radboud University Nijmegen Medical Centre, The Netherlands.
authors.forename: Anne Margreet R
authors.initials: AM
authors.lastname: Cuperus
authors.forename: Marit C
authors.initials: MC
authors.lastname: Harms
authors.forename: Frits A
authors.initials: FA
authors.lastname: Rangel
authors.forename: Ewald M
authors.initials: EM
authors.lastname: Bronkhorst
authors.forename: Jan G J H
authors.initials: JG
authors.lastname: Schols
authors.forename: K Hero
authors.initials: KH
authors.lastname: Breuning
mesh_terms: D002102:Cadaver; D016009:Chi-Square Distribution; D003198:Computer Simulation; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods; D003765:Models, Dental; D009811:Odontometry / Q000379:methods; D023861:Photography, Dental / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results; D012986:Software Validation