Research Article Studying the Optical 3D Accuracy of Intraoral Scans: An In Vitro Study Pokpong Amornvit , Sasiwimol Sanohkan , and Chaimongkon Peampring Department of Prosthetic Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla 90110, ailand Correspondence should be addressed to Sasiwimol Sanohkan; ssasiwimol@yahoo.com Received 30 April 2019; Revised 20 October 2019; Accepted 11 November 2019; Published 14 February 2020 Academic Editor: Antonio Gloria Copyright © 2020 Pokpong Amornvit et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ere are various scanners available in dental practice with various accuracies. e aim of this study was to compare the 3D capturing accuracy of scans obtained from Trios 3 and Dental Wings scanner. A reference mandibular model was printed from FormLab with reference points in three axes (X, Y, and XY and Z). e printed model was scanned 5 times with 3 scans: normal scan by Trios 3 (Trios 3A), high-resolution scan by Trios 3 (Trios 3B), and normal scan by Dental Wings. After scan, the stereolithography (stl) files were generated. en, the measurements were made from the computer software using Rhinoceros 3D (Rhino, Robert McNeel & Associates for Windows, Washington DC, USA). e measurements made with digital caliper were taken as control. Statistical analysis was done using one-way ANOVA with post hoc using Sheffe (P < 0.01). Trios 3 presented higher accuracy than Dental Wings and high resolution showed better results. e Dental Wings showed less accuracy at the measurements >50mmoflengthand >30 mm in width. ere was no significant difference (P > 0.05) of control with the Trios 3A and Trios 3B. Similarly, for the measurements in Z-axis, there was no significant difference of control with each scan (Trios 3A, Trios 3B, and Dental Wings). Accuracy of the scan is affected by the length of the scanning area and scanning pattern. It is less recommended to Dental Wings scan >3-unit prosthesis and that crosses the midline. 1.Introduction ere has been massive advancement in digital dentistry in the recent decade, especially since the invention of computer- aided design/ computer-aided manufacturing (CAD/CAM) system, milling systems, rapid and automated prototyping, and three-dimensional (3D) printing of dental biomaterials, and these have revolutionized and created a new modality in dentistry [1]. Currently, CAD/CAM is widely used in virtual occlusal records, full-mouth reconstruction, and orthodontics [2–4]. Moreover, they are extensively used in both the dental laboratory and the dental clinic for the fabrication of various prosthesis, such as inlays, onlays, veneers, crowns, fixed partial dentures, orthodontic aligners, surgical guides, and implant abutments [3]. A 3D scanning is a process that is used to capture the shape of an object using a 3D scanner. After scanning, a 3D file of an object is created which can be edited, and 3D printed. An intraoral scan (IOS) can be based on many different technologies, each with its own limitations, advantages, and costs [5]. Many limitations in the kind of objects that can be digitized are still present. For example, optical technology may encounter many difficulties with shiny, reflective, or transparent objects. Teeth, especially the anterior, play in the esthetics of face [6]. For a successful esthetic dental restoration, a good dental impression is important [7, 8]. With the use of digital dentistry, the intraoral conditions can be transferred digi- tally and printed. When dental laboratories receive a digital impression, they create a model from the data and either continue with the traditional fabrication procedure or rescan the model and fabricate the prosthesis. e dental technician can do all the design restorative works directly on the computer based on the digital file received. Hence, the digital impression plays an important in the fabrication of all digital works and the accuracy of the impression is very important. ere are various 3D scanners technologies, such as image capturing or video capturing type contact scanning or noncontact scanning [9–12]. Contact canners probe the Hindawi Journal of Healthcare Engineering Volume 2020, Article ID 5739312, 9 pages https://doi.org/10.1155/2020/5739312