Evaluation of the effect of contamination of the scan-mirror of an intra-oral scanner on the accuracy of the scan data: A pilot study

Jeong, Yun-Su; Jeong, Chang-Mo; Yun, Mi-Jung; Huh, Jung-Bo; Lee, So-Hyoun; Lee, Hyeonjong

doi:2021.59.6.334

J Korean Dent Assoc > Volume 59(6); 2021 > Article

ORIGINAL ARTICLE

The Journal of The Korean Dental Association 2021;59(6):334-340.
DOI: https://doi.org/10.22974/jkda.2021.59.6.002 Published online May 31, 2021.

구강 스캐너 거울면의 오염도가 스캔 데이터의 정확도에 미치는 영향 평가

정윤수

부산대학교 치의학전문대학원 치과보철학교실

Evaluation of the effect of contamination of the scan-mirror of an intra-oral scanner on the accuracy of the scan data: A pilot study

Yun-Su Jeong

Department of Prosthodontics, School of Dentistry, Pusan National University

Correspondence: Hyeonjong Lee
Email: hyunjongqqq@gmail.com

Received: 23 February 2021 • Revised: 8 March 2021 • Accepted: 27 April 2021

Abstract

Purpose
This study was conducted to evaluate the influence of contamination of the scan-mirror on the accuracy of obtained scan data by using two type of intra-oral scanner. Materials & methods: After printing the Crown & inlay specimens according to the ISO standard, the data values of the specimens were calculated using a model scanner and two intra-oral scanners. Experimental groups were classified into three groups according to cleanliness of scan-mirror. Each group performed 10 repeated scans. Data analysis was performed with statistical software (SPSS 25, IBM Corp., Armonk, New York, USA) to check the normality of data sets and ANOVA & Bonferroni test was performed for multiple comparisons between groups.
Results
The d1(top diameter of cylinder), d2(bottom diameter of cylinder), h(cylinder height) values of the crown specimens and d1(top diameter of cavity), d2(bottom diameter of cavity), h(cavity height) of the inlay specimens compared with the reference data using two intra-oral scanners were similar for each group.
Discussion
In the scanning process, it was observed on the screen that a data value that deviated from the normal range was inputted in the group with higher level of contamination, but they were removed through the software’s own filtering and post-processing, and it was found that there was no significant effect on the result values.
Conclusion
Under the conditions of this study, as the degree of contamination of the scan-mirror surface increased, an inaccurate capture screen appeared, but it did not significantly affect the accuracy and precision of the scan data.

Key Words: intra-oral scanner; accuracy; scan-mirror