Influence of titanium dioxide and composite on the accuracy of an intraoral scanner for bilateral upper posterior edentulous jaw (Kennedy class I) scanning: An in vitro study

Hung Manh Vo; Nam Cong-Nhat Huynh; Trang Thi-Ngoc Tran; Hung Trong Hoang; Anh Thi-Lan Nguyen

doi:10.1016/j.jdent.2023.104747

Influence of titanium dioxide and composite on the accuracy of an intraoral scanner for bilateral upper posterior edentulous jaw (Kennedy class I) scanning: An in vitro study

J Dent. 2023 Dec:139:104747. doi: 10.1016/j.jdent.2023.104747. Epub 2023 Oct 19.

Authors

Hung Manh Vo¹, Nam Cong-Nhat Huynh², Trang Thi-Ngoc Tran¹, Hung Trong Hoang¹, Anh Thi-Lan Nguyen¹

Affiliations

¹ Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam.
² Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam. Electronic address: namhuynh@ump.edu.vn.

PMID: 37863172
DOI: 10.1016/j.jdent.2023.104747

Abstract

Objectives: The accuracy of 3-dimensional images produced by the intraoral scanner (IOS) is affected by scanning-aid materials. This in vitro study aimed to elucidate the influence of scanning-aid materials on the accuracy (trueness and precision) of digital scanning on the bilateral upper posterior edentulous jaw (Kennedy class I).

Methods: The asymmetrical bilateral upper posterior edentulous model (reference model) was generated using a 3D printer with three groups (application of TiO₂ powder - composite and no-treatment control). The experimental scans were executed (n = 10 per group) using TRIOS3 (3shape), while one reference scan was obtained by an industrial scanner (Solutionix - C500). Values of trueness and precision were evaluated using the 3D superimposition method on mean deviation values. The accuracy was assessed using mean deviation values following the 3D superimposition method.

Results: IOS had high trueness (20.6 µm), and significant differences were found between the no-treatment and TiO₂ groups. Considering the cut-off value of deviations as 300 µm for clinical acceptability, the analysis clarified the most variations in the control group. There was a significant difference between the no-treatment group and others in the maxillary tuberosity area relating to long-span edentulous. The composite group had the best precision values (1.1 µm). Significant differences were found between composite and TiO₂ groups (2.7 µm).

Conclusions: The bilateral upper posterior edentulous jaw digital impressions obtained using IOS were accurate. However, the digital images in the palate and maxillary tuberosity area related to long-span edentulous differed significantly. TiO₂-containing powder and composite landmarks affected the accuracy and stability of the IOS.

Clinical significance: Scanning aid materials can increase the accuracy of the bilateral upper posterior edentulous jaw scanning with IOS.

Keywords: Accuracy; CAD/CAM; Digital dentistry; Intraoral-scanner; Resin composite; TiO(2)-containing powder.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Computer-Aided Design
Dental Impression Technique*
Humans
Imaging, Three-Dimensional
Jaw, Edentulous* / diagnostic imaging
Models, Dental
Powders

Substances

titanium dioxide
Powders