Influence of 3D analysis software on measured deviations of CAD-CAM resin crowns from virtual design file: An in-vitro study. (March 2022)

• Record Type: Journal Article
• Authors: Yilmaz, Burak; Marques, Vinicius Rizzo; Donmez, Mustafa Borga; Cuellar, Alfonso Rodriguez; Lu, Wei-En; Abou-Ayash, Samir; Çakmak, Gülce
• Is Part Of: Journal of dentistry. Volume 118(2022)
• Publication Date: 2022-03
• Subjects: 3D analysis -- Deviation -- Nonmetrology-grade software -- Metrology-grade software; Dentistry -- Periodicals; Dentistry -- Periodicals; Dentisterie -- Périodiques; Electronic journals; 617.6005
• DOI: 10.1016/j.jdent.2021.103933
• Languages: English
• ISSNs: 0300-5712

Abstract

Highlights: Scans of the fabricated crowns may be used to evaluate the quality of the manufacturing process. Detected deviations between scans of the crowns and virtual design file were similar when a nonmetrology or metrology-grade software was used. The nonmetrology-grade 3D analysis software may be used to analyze the deviations of CAD-CAM crowns from the virtual design file. Abstract: Objectives: To evaluate a nonmetrology-grade and a metrology-grade 3D analysis software when measuring the deviations of computer-aided-design/ computer-aided-manufacturing (CAD-CAM) fabricated crowns from the virtual design file. Materials and Methods: A right first molar on a mandibular dentate model was prepared and scanned with an intraoral scanner, i500 (Medit). A complete coverage crown was designed in standard tessellation language (STL) format and 20 resin crowns were fabricated with CAD-CAM. The crowns were then digitized using the same intraoral scanner (test-scans). Root mean square (RMS) method was used to evaluate the deviations between the test-scans and the design file of the crowns on 3 surfaces (overall, external, and internal) using a metrology-grade, Geomagic Control X (3D Systems) and a nonmetrology-grade, Medit Link (Medit) software. The data were analyzed with Welch two-sample t-tests to compare two software for the non-inferiority of the nonmetrology-grade software with a 50 µm threshold and the potential superiority of the metrology-grade software (α = 0.05). Results: The Welch two-sample t-tests for the non-inferiority analysis showed that the differences between the nonmetrology-grade and the metrology-grade software were below the threshold of 50 µm for each surface tested ( p <0.001). The differences between the two-tested software were nonsignificant for each surface analyzed when superiority was considered ( p ≥.194). Conclusion: The nonmetrology-grade software performed similar to the metrology-grade software when analyzing the deviations of CAD-CAM crowns. Therefore, the nonmetrology-grade 3D analysis software may be considered for the deviation measurements of similar restorations. Clinical Significance: The trueness of crowns after fabrication may affect their fit, and 3D analysis of trueness prior to the delivery appointment with the tested nonmetrology-grade software after fabrication may facilitate potential clinical adjustments and delivery of the crowns.