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Int J Environ Res Public Health. 2019 Mar 20;16(6). pii: E1021. doi: 10.3390/ijerph16061021.

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

Author information

1
Department of Dentistry, School of Dentistry, Seoul National University, Seoul 03080, Korea. jymaeng@snu.ac.kr.
2
Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea. limdds@snu.ac.kr.
3
Clinical Translational Research Center for Dental Science, Seoul National University Dental Hospital, Seoul 03080, Korea. bjkim016@gmail.com.
4
Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea. silk1@snu.ac.kr.
5
Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea. proskwon@snu.ac.kr.

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:

2-dimensional analysis; RMS; accuracy; external deviation; internal deviation; intraoral scanners

PMID:
30897832
PMCID:
PMC6466129
DOI:
10.3390/ijerph16061021
[Indexed for MEDLINE]
Free PMC Article

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