The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Impact of scanning strategy on the accuracy of complete-arch intraoral scans: a preliminary study on segmental scans and merge methods

  • Mai, Hai Yen (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Mai, Hang-Nga (Institute for Translational Research in Dentistry, Kyungpook National University) ;
  • Lee, Cheong-Hee (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Lee, Kyu-Bok (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Kim, So-yeun (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Lee, Jae-Mok (Department of Periodontology, Kyungpook National University School of Dentistry) ;
  • Lee, Keun-Woo (VHS Medical Center) ;
  • Lee, Du-Hyeong (Department of Prosthodontics, School of Dentistry, Kyungpook National University)
  • Received : 2022.01.03
  • Accepted : 2022.03.28
  • Published : 2022.04.30
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Abstract

PURPOSE. This study investigated the accuracy of full-arch intraoral scans obtained by various scan strategies with the segmental scan and merge methods. MATERIALS AND METHODS. Seventy intraoral scans (seven scans per group) were performed using 10 scan strategies that differed in the segmental scan (1, 2, or 3 segments) and the scanning motion (straight, zigzag, or combined). The three-dimensional (3D) geometric accuracy of scan images was evaluated by comparison with a reference image in an image analysis software program, in terms of the arch shape discrepancies. Measurement parameters were the intermolar distance, interpremolar distance, anteroposterior distance, and global surface deviation. One-way analysis of variance and Tukey honestly significance difference post hoc tests were carried out to compare differences among the scan strategy groups (α = .05). RESULTS. The linear discrepancy values of intraoral scans were not different among scan strategies performed with the single scan and segmental scan methods. In general, differences in the scan motion did not show different accuracies, except for the intermolar distance measured under the scan conditions of a 3-segmental scan and zigzag motion. The global surface deviations were not different among all scan strategies. CONCLUSION. The segmental scan and merge methods using two scan parts appear to be reliable as an alternative to the single scan method for full-arch intraoral scans. When three segmental scans are involved, the accuracy of complete arch scan can be negatively affected.

Keywords

Acknowledgement

This work was supported by the Korea Medical Device Development Fund grant funded by the Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, Republic of Korea, the Ministry of Food and Drug Safety) (202011A02).

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