Comparison of accuracy and reproducibility of casts made by digital and conventional methods

Seok-Hwan Cho; Oliver Schaefer; Geoffrey A Thompson; Arndt Guentsch

doi:10.1016/j.prosdent.2014.09.027

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Comparison of accuracy and reproducibility of casts made by digital and conventional methods

Journal article

Peer reviewed

Comparison of accuracy and reproducibility of casts made by digital and conventional methods

Seok-Hwan Cho, Oliver Schaefer, Geoffrey A Thompson and Arndt Guentsch

The Journal of prosthetic dentistry, Vol.113(4), pp.310-315

04/2015

DOI: 10.1016/j.prosdent.2014.09.027

PMID: 25682531

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Abstract

Little peer-reviewed information is available regarding the accuracy and reproducibility of digitally fabricated casts compared to conventional nondigital methods. The purpose of this in vitro study was to compare the accuracy and reproducibility of a digital impression and cast fabrication with a conventional impression and cast fabrication. Conventional impressions were made via a 1-step single viscosity technique with vinyl siloxanether material of a typodont master model, and conventional casts were cast from dental stone. Digital impressions were obtained with a digital scanner, and digital stereolithographic models were printed. The typodont and fabricated casts were digitized with a structured light scanner and saved in surface tessellation language (STL) format. All STL records were superimposed via a best-fit method. The digital impression and cast fabrication method was compared with the conventional impression and cast fabrication method for discrepancy, accuracy, and reproducibility. The Levene test was used to determine equality of variances, and a 1-way ANOVA was conducted to assess the overall statistical significance of differences among the groups (n=5, α=.05). No significant statistical difference was found between the digital cast and conventional casts in the internal area or finish line area (P>.05). In addition, there was no statistically significant difference between these 2 techniques for a fixed dental prosthesis or single crown (P>.05). However, statistically significant differences were observed for overall areas of the casts in terms of accuracy (P<.01) and reproducibility (P<.001). Digital impression and cast fabrication were less accurate and reproducible than conventional impression and cast fabrication methods. No statistically significant difference was found between the digital cast and conventional cast groups in the internal and finish line areas. However, in terms of the reproducibility and accuracy of the entire cast area, the conventional cast was significantly better than the digital cast.

Algorithms

Calcium Sulfate - chemistry

Computer-Aided Design - statistics & numerical data

Crowns - statistics & numerical data

Dental Casting Technique - statistics & numerical data

Dental Impression Materials - chemistry

Dental Impression Technique - statistics & numerical data

Dental Materials - chemistry

Dental Prosthesis Design - statistics & numerical data

Denture Design - statistics & numerical data

Denture, Partial, Fixed - statistics & numerical data

Humans

Image Processing, Computer-Assisted - statistics & numerical data

Polyvinyls - chemistry

Reproducibility of Results

Siloxanes - chemistry

Surface Properties

Details

Title: Subtitle: Comparison of accuracy and reproducibility of casts made by digital and conventional methods
Creators: Seok-Hwan Cho - Marquette University
Oliver Schaefer - Friedrich Schiller University Jena
Geoffrey A Thompson - Marquette University
Arndt Guentsch - Marquette University
Resource Type: Journal article
Publication Details: The Journal of prosthetic dentistry, Vol.113(4), pp.310-315
DOI: 10.1016/j.prosdent.2014.09.027
PMID: 25682531
ISSN: 0022-3913
eISSN: 1097-6841
Language: English
Date published: 04/2015
Academic Unit: Prosthodontics
Record Identifier: 9984367619002771

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