title: Reliability of measurements made on scanned cast models using the 3 Shape R 700 scanner.
abstract: OBJECTIVE
  In dentistry, the latest technological advancements have been incorporated primarily into diagnostic tools such as virtual dental models. The aim of this study was to evaluate the reliability of measurements made on digital cast models scanned in the 3 Shape R 700 scanner (3 Shape, Copenhagen, Denmark) that uses a non-destructive laser beam to reproduce model surfaces so that the plaster model is not destroyed.
  
  
  METHODS
  The sample consisted of 26 cast models, and 6 linear measurements were made on the cast models and compared with the same measurements on digital models. The measurements assessed were: (1) distance between mandibular canines; (2) distance between mandibular molars; (3) distance between canine and maxillary molar; (4) buccal-lingual diameter of maxillary central incisor; (5) distance between two points of the incisive papillae of maxillary and mandibular central incisors; and (6) distance between the buccal surface of the maxillary central incisor and the buccal surface of the mandibular antagonist (overjet). The Student's t-test or Wilcoxon test was used at 5% and the Lin's concordance test at 95% confidence interval.
  
  
  RESULTS
  The overjet measurement was the only one that showed a statistically significant difference (p < 0.05). A high level of concordance was found for all measurements.
  
  
  CONCLUSIONS
  The digital models obtained from the 3 Shape R 700 scanner are reliable and can be considered an alternative to cast models for performing measurements and analyses in orthodontic practice.
authors: 1 Department of Orthodontics, Federal University of Bahia, Salvador, Bahia, Brazil.
authors: L S
authors: LS
authors: Lemos
authors: 2 Department of Integrated Clinic and Propaedeutics, Federal University of Bahia, Salvador, Bahia, Brazil.
authors: I M C R
authors: IM
authors: Rebello
authors: 1 Department of Orthodontics, Federal University of Bahia, Salvador, Bahia, Brazil.
authors: C J
authors: CJ
authors: Vogel
authors: 1 Department of Orthodontics, Federal University of Bahia, Salvador, Bahia, Brazil.
authors: M C
authors: MC
authors: Barbosa
mesh_terms: D006801:Humans; D021621:Imaging, Three-Dimensional; D003765:Models, Dental; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted; D011861:Radiography, Dental / Q000295:instrumentation*; D015203:Reproducibility of Results
keywords: dental models; orthodontics; three-dimensional imaging
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