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

Jiyoun Maeng, Young-Jun Lim, Bongju Kim, Myung-Joo Kim and Ho-Beom Kwon
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Jiyoun Maeng: Department of Dentistry, School of Dentistry, Seoul National University, Seoul 03080, Korea
Young-Jun Lim: Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea
Bongju Kim: Clinical Translational Research Center for Dental Science, Seoul National University Dental Hospital, Seoul 03080, Korea
Myung-Joo Kim: Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea
Ho-Beom Kwon: Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea

IJERPH, 2019, vol. 16, issue 6, 1-10

Abstract: 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 ® (3 Shape, Copenhagen, Denmark) and EzScan ® (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 ® showed statistically significant higher accuracy in root mean square (RMS) at BL, TH, and TL ( p < 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 ( p < 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.

Keywords: intraoral scanners; accuracy; 2-dimensional analysis; internal deviation; external deviation; RMS (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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