title: Three-dimensional evaluation of the repeatability of scanned conventional impressions of prepared teeth generated with white- and blue-light scanners.
abstract: BACKGROUND
  Digital scanning is increasingly used in prosthodontics. Three-dimensional (3D) evaluations that compare the repeatability of the blue-light scanner with that of the white-light scanner are required.
  
  
  OBJECTIVE
  The purpose of this in vitro study was to evaluate the repeatability of conventional impressions of abutment teeth digitized with white- and blue-light scanners and compare the findings for different types of abutment teeth.
  
  
  METHODS
  Impressions of the canine, premolar, and molar abutment teeth were made and repeatedly scanned with each scanner type to obtain 5 sets of 3D data for each tooth. Point clouds were compared, and error sizes per tooth and scanner type were measured (n=10). One-way ANOVA with Tukey honest significant differences multiple comparison and independent t tests were performed to evaluate repeatability (α=.05).
  
  
  RESULTS
  Repeatability (mean ±SD) of the white- and blue-light scanners for canine, premolar, and molar teeth was statistically significant (means: P=.001, P<.001, P<.001; ±SD: P<.001, P<.001, P=.003). Means of discrepancies with the white-light scanner (P<.001) were 5.8 μm for the canine, 5.9 μm for the premolar, and 8.6 μm for the molar teeth and 4.4 μm, 2.9 μm, and 3.2 μm, respectively, with the blue-light scanner (P<.001). Corresponding SDs of discrepancies with the white-light scanner (P<.001) were 15.9 μm for the canine, 23.2 μm for the premolar, and 14.6 μm for the molar teeth and 9.8 μm, 10.6 μm, and 11.2 μm, respectively, with the blue-light scanner (P=.73).
  
  
  CONCLUSIONS
  On evaluation of the digitized abutment tooth impressions, the blue-light scanner exhibited greater repeatability than the white-light scanner.
authors.affiliation: Doctoral student, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
authors.forename: Jin-Hun
authors.initials: JH
authors.lastname: Jeon
authors.affiliation: Assistant, Department of Mechanical Engineering, College of Engineering, Korea University, Seoul, Republic of Korea.
authors.forename: Byeong-Yeol
authors.initials: BY
authors.lastname: Choi
authors.affiliation: Doctoral student, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
authors.forename: Chong-Myeong
authors.initials: CM
authors.lastname: Kim
authors.affiliation: Professor, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
authors.forename: Ji-Hwan
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Associate Professor, Department of Dental Laboratory Science and Engineering, College of Health Science and Department of Public Health Sciences, Graduate School and BK21+ Program in Public Health Science, Korea University, Seoul, Republic of Korea.
authors.forename: Hae-Young
authors.initials: HY
authors.lastname: Kim
authors.affiliation: Professor, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea. Electronic address: kuc2842@korea.ac.kr.
authors.forename: Woong-Chul
authors.initials: WC
authors.lastname: Kim
mesh_terms: D000818:Animals; D003442:Crowns; D000044:Dental Abutments; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000295:instrumentation*; D004285:Dogs; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D003765:Models, Dental; D015898:Tomography Scanners, X-Ray Computed / Q000592:standards*; D019246:Tooth Preparation / Q000379:methods*
chemical_list: D003760:Dental Impression Materials