A direct intraoral scanning is truly free of a physical impression so that it is able to get rid of the errors derived from the distortion of elastomeric impressions, disproportionate water/powder ratio of dental plaster and unsuitable storage conditions of physical impressions or gypsum casts. An extraoral optical scanner can allow a fast and high-resolution data acquisition with the accuracy of 5–10μm, while the accuracy of intraoral scanning is stated to be 50μm. There are two ways to create a digital impression: direct intraoral scanning or indirect extraoral scanning gypsum casts. As the initial step of dental CAD/CAM (computer aided designed/computer aided manufactured) techniques, digital impression is increasingly applied in single crowns, multi-unit fixed dental prostheses (FDPs), and has expanded in recent years in the field of oral implants, complete denture prosthodontics and obturator prostheses. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.Ĭompeting interests: The authors have declared that no competing interests exist.ĭigital impressions and scanning systems were introduced in dentistry in the mid 1980s. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ĭata Availability: All relevant data are available from the Clinical Trial Management Public Platform (public access without accession number).įunding: This work was supported by the National Natural Science Foundation of China (Project Number: 81100774 URL: ), and Shanghai Science and Technology Commission Funded Projects (Project Number: 114119a3900, 14411964200 URL: ). Received: ApAccepted: JPublished: July 6, 2016Ĭopyright: © 2016 Gan et al. PLoS ONE 11(7):Įditor: Gianpaolo Papaccio, Second University of Naples, ITALY It should be confirmed in further studies that whether accuracy of digital impressions for whole upper jaws is clinically acceptable.Ĭitation: Gan N, Xiong Y, Jiao T (2016) Accuracy of Intraoral Digital Impressions for Whole Upper Jaws, Including Full Dentitions and Palatal Soft Tissues. Wider dental arch contributed to lower precision of an intraoral digital impression. It was feasible to use the intraoral scanner to obtain digital impressions for whole upper jaws. A linear correlation was found between arch width and precision of digital impressions for whole upper jaws (r = 0.326, p = 0.034 for palatal soft tissues and r = 0.485, p = 0.002 for full dentitions). Larger deviations were found between intraoral digital impressions and conventional impressions in the areas of palatal soft tissues than that in the areas of full dentitions (p0.05), but arch width was found to have a significant effect on precision of intraoral digital impressions for full dentitions (p = 0.016). For the digital impressions for upper full dentitions, trueness was (80.01☑7.78)μm and precision was (59.52☑1.29)μm. For the digital impressions for palatal soft tissues, trueness was (130.54☓3.95)μm and precision was (55.26☑1.21)μm. Color-coded deviation maps showed qualitative visualization of the deviations. All datasets were imported to a specific software program for 3D analysis by "best fit alignment" and "3D compare" process. Three-dimensional (3D) images digitized from conventional gypsum casts by a laboratory scanner were chose as the reference models. Each volunteer received three scans with TRIOS intraoral scanner and one conventional impression of whole upper jaw. Thirty-two volunteers were divided into three groups according to the palatal vault height or arch width. The aim of this study was to compare the accuracy (trueness and precision) of intraoral digital impressions for whole upper jaws, including the full dentitions and palatal soft tissues, as well as to determine the effect of different palatal vault height or arch width on accuracy of intraoral digital impressions. Intraoral digital impressions have been stated to meet the clinical requirements for some teeth-supported restorations, though fewer evidences were proposed for larger scanning range.
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