title: [Accuracy and reproducibility of intraoral scanning in vivo].
abstract: OBJECTIVE
  To evaluate the accuracy and reproducibility of intraoral scanning system by comparing linear measurements obtained from conventional models and digital models.
  
  
  METHODS
  Both conventional models (control group) and intraoral scanning (experimental group) of 5 volunteers were made. After taking silicon impressions, the volunteers' oral cavities were scanned directly by Trios Ortho (3 Shape) at 8a.m., 13p.m., 18p.m. and repeated for 15 days. The gypsum models were measured by digital caliper and regarded as golden standard. The intraoral scanning files were measured by Simplant software. A well-trained examiner measured them in random order at 8a.m., 13p.m. and 18p.m. The measurements were repeated for 15 times. Datasets obtained from different groups were compared for accuracy via paired t test. A one-way analysis of variance (ANOVA) was implemented to compare differences within experimental groups for reproducibility using SAS 11.0 software package.
  
  
  RESULTS
  There was a significant linear difference between gypsum model and intraoral scanning digital model in the parameter of 23L from volunteer V1 (P<0.01). In terms of accuracy and reproducibility, no significant difference was found (P>0.05).
  
  
  CONCLUSIONS
  The accuracy and reproducibility of intraoral scanning on whole arches are quite acceptable in this in vivo study.
authors.affiliation: Department of Orthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China. E-mail:rayxyl26@163.com.
authors.forename: Yi-Lun
authors.initials: YL
authors.lastname: Xie
authors.forename: Gang
authors.initials: G
authors.lastname: Shen
mesh_terms: D000704:Analysis of Variance; D002133:Calcium Sulfate; D003761:Dental Impression Technique; D006801:Humans; D011877:Radionuclide Imaging; D015203:Reproducibility of Results; D012984:Software
chemical_list: D002133:Calcium Sulfate