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

Burak Yilmaz; Vinicius Rizzo Marques; Mustafa Borga Donmez; Alfonso Rodriguez Cuellar; Wei-En Lu; Samir Abou-Ayash; Gülce Çakmak

doi:10.1016/j.jdent.2021.103933

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

J Dent. 2022 Mar:118:103933. doi: 10.1016/j.jdent.2021.103933. Epub 2021 Dec 18.

Authors

Burak Yilmaz¹, Vinicius Rizzo Marques², Mustafa Borga Donmez³, Alfonso Rodriguez Cuellar⁴, Wei-En Lu⁵, Samir Abou-Ayash⁶, Gülce Çakmak⁷

Affiliations

¹ Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland; Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, OH, USA. Electronic address: burak.yilmaz@zmk.unibe.ch.
² Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland. Electronic address: marqvr@gmail.com.
³ Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Prosthodontics, Biruni University Faculty of Dentistry, Istanbul, Turkey. Electronic address: bdonmez@biruni.edu.tr.
⁴ Periodontology, Private Practice, Mexico City, Mexico. Electronic address: alfonso_rodriguez@my.unitec.edu.mx.
⁵ Division of Biostatistics, The Ohio State University College of Public Health, Columbus, Ohio, USA. Electronic address: lu.1408@osu.edu.
⁶ Head of the Section of Digital Implant and Reconstructive Dentistry, Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland. Electronic address: samir.abou-ayash@zmk.unibe.ch.
⁷ Buser Foundation Scholar for Implant Dentistry, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland. Electronic address: guelce.cakmak@zmk.unibe.ch.

PMID: 34929340
DOI: 10.1016/j.jdent.2021.103933

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.

Keywords: 3D analysis; Deviation; Metrology-grade software; Nonmetrology-grade software.

MeSH terms

Computer-Aided Design
Crowns*
Dental Marginal Adaptation
Dental Prosthesis Design*
Molar
Software