A New Approach to Accuracy Evaluation of Single-Tooth Abutment Using Two-Dimensional Analysis in Two Intraoral Scanners

• Main Authors: Jiyoun Maeng, Young-Jun Lim, Bongju Kim, Myung-Joo Kim, Ho-Beom Kwon
• Format: Article
• Language: English
• Published: MDPI AG 2019-03-01
• Series: International Journal of Environmental Research and Public Health
• Subjects: intraoral scanners; accuracy; 2-dimensional analysis; internal deviation; external deviation; RMS
• Online Access: https://www.mdpi.com/1660-4601/16/6/1021

The aim of this study was to two-dimensionally evaluate deviation errors at five digital cross-sections of single-tooth abutment in regards to data obtained from two intraoral scanners, and to evaluate accuracy of individual scanners. Two intraoral scanners, the Trios 3^&#174; (3 Shape, Copenhagen, Denmark) and EzScan^&#174; (Vatech, Hwaseong, Korea), were evaluated by utilizing 13 stone models. The superimposed 3D data files were sectioned into five different planes: buccal-lingual section (BL), mesial-distal section (MD), transverse high section (TH), transverse middle section (TM), and transverse low section (TL). Accuracy comparison between the two scanners in 5 groups was performed. BL vs. MD of each scanner, and three transverse groups (TH, TM, TL) of each scanner were analyzed for accuracy comparison. In comparison of 2-D analyses for two intraoral scanners, Trios 3^&#174; showed statistically significant higher accuracy in root mean square (RMS) at BL, TH, and TL (<i>p</i> &lt; 0.05). For each scanner, RMS value showed that mesial-distal sections were more prone to error than buccal-lingual section, which exhibited statistically significant errors (<i>p</i> &lt; 0.05) while the transverse groups did not. Two-dimensional analysis is more insightful than three-dimensional analysis on single-tooth abutment. In mesiodistal areas, rough prepped areas, and sharp edges where scanner accessibility is difficult, high deviation errors are shown.