Impact of scanning distance on the accuracy of a photogrammetry system

Marta Revilla-León; Miguel Gómez-Polo; Michael Drone; Abdul B Barmak; Clara Guinot-Barona; Wael Att; John C Kois; Jorge Alonso Pérez-Barquero

doi:10.1016/j.jdent.2024.104854

Impact of scanning distance on the accuracy of a photogrammetry system

J Dent. 2024 Mar:142:104854. doi: 10.1016/j.jdent.2024.104854. Epub 2024 Jan 19.

Authors

Marta Revilla-León¹, Miguel Gómez-Polo², Michael Drone³, Abdul B Barmak⁴, Clara Guinot-Barona⁵, Wael Att⁶, John C Kois⁷, Jorge Alonso Pérez-Barquero⁸

Affiliations

¹ Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, Faculty & Director of Research and Digital Dentistry, Kois Center, University of Washington, Seattle, WA, United States; Graduate Prosthodontics, Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, MA, United States.
² Department of Conservative Dentistry and Prosthodontics, School of Dentistry, Complutense University of Madrid, Pza. Ramón y Cajal s/n., Madrid 28033, Spain. Electronic address: mgomezpo@ucm.es.
³ Private Practice, United States.
⁴ Clinical Research and Biostatistics, Eastman Institute of Oral Health, University of Rochester Medical Center, Rochester, NY, United States.
⁵ Department of Dental Orthodontics, Faculty of Medicine and Health Sciences, Universidad Católica de Valencia, Valencia, Spain.
⁶ Founder and Director, The Face Dental Group, Boston, MA, United States; Department of Prosthodontics, University Hospital of Freiburg, Germany.
⁷ Founder and Director Kois Center, Affiliate Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, and Private Practice, Seattle, WA, United States.
⁸ Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.

PMID: 38246309
DOI: 10.1016/j.jdent.2024.104854

Abstract

Purpose: To measure the impact of the scanning distance on the accuracy of complete-arch implant scans acquired by using a photogrammetry (PG) system.

Material and methods: An edentulous cast with 6 implant abutment analogs was obtained. A brand new implant scan body was positioned on each implant abutment and digitized using an extraoral scanner (T710; Medit) and the reference file was obtained. Three groups were created based on the scanning distance used to acquire complete-arch implant scans by using a PG (PIC System; PIC Dental): 20 (20 group), 30 (30 group), and 35 cm (35 group). An optical marker (PIC Transfer, HC MUA Metal; PIC Dental) was placed on each implant abutment and a total of thirty scans per group were acquired. Euclidean linear and angular measurements were obtained on the reference file was obtained and used to compare the discrepancies with the same measurements obtained on each experimental scan. One-way ANOVA and Tukey tests were used to analyze trueness. The Levene test was used to analyze the precision values (α = 0.05).

Results: Significant linear (P < .001) and angular trueness (P < .001) discrepancies were found among the groups. For linear trueness, Tukey test showed that the 20 and 30 groups (P < .001) and 30 and 35 groups were different (P < .001). For angular trueness, the Tukey test revealed that 20 and 30 groups (P = .003), 20 and 35 (P < .001), and 30 and 35 groups were different (P < .001) The Levene test showed no significant linear precision (P = .197) and angular discrepancies (P = .229) among the groups.

Conclusions: The scanning distance influenced the trueness of complete-arch implant scans obtained with the PG method tested. The maximum linear trueness mean discrepancy among the groups tested was 10 µm and the maximum angular trueness mean discrepancy among the groups tested was 0.02 .

Keywords: Accuracy; Digital impression; Implant scan; Intraoral scanner; Photogrammetry.

MeSH terms

Computer-Aided Design
Dental Implants*
Dental Impression Technique
Humans
Imaging, Three-Dimensional
Models, Dental
Mouth, Edentulous*

Substances

Dental Implants