title: [Evaluation of the quality of three-dimensional data acquired by using two kinds of structure light intra-oral scanner to scan the crown preparation model].
abstract: OBJECTIVE
  To quantitatively evaluate the quality and accuracy of three-dimensional (3D) data acquired by using two kinds of structure intra-oral scanner to scan the typical teeth crown preparations.
  
  
  METHODS
  Eight typical teeth crown preparations model were scanned 3 times with two kinds of structured light intra-oral scanner(A, B), as test group. A high precision model scanner were used to scan the model as true value group. The data above the cervical margin was extracted. The indexes of quality including non-manifold edges, the self-intersections, highly-creased edges, spikes, small components, small tunnels, small holes and the anount of triangles were measured with the tool of mesh doctor in Geomagic studio 2012. The scanned data of test group were aligned to the data of true value group. 3D deviations of the test group compared with true value group were measured for each scanned point, each preparation and each group. Independent-samples Mann-Whitney U test was applied to analyze 3D deviations for each scanned point of A and B group. Correlation analysis was applied to index values and 3D deviation values.
  
  
  RESULTS
  The total number of spikes in A group was 96, and that in B group and true value group were 5 and 0 respectively. Trueness: A group 8.0 (8.3) μm, B group 9.5 (11.5) μm(P>0.05). Correlation analysis of the number of spikes with data precision of A group was r=0.46.
  
  
  CONCLUSIONS
  In the study, the qulity of the scanner B is better than scanner A, the difference of accuracy is not statistically significant. There is correlation between quality and data precision of the data scanned with scanner A.
authors.affiliation: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Zhang
authors.affiliation: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.affiliation: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Zhao
authors.affiliation: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
authors.forename: Y C
authors.initials: YC
authors.lastname: Sun
mesh_terms: D003442:Crowns; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000592:standards*; D008027:Light; D011877:Radionuclide Imaging; D018709:Statistics, Nonparametric; D019228:Tooth Crown / Q000000981:diagnostic imaging*