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Journal of Biomedical Optics

Micrometric precision of prosthetic dental crowns obtained by optical scanning and computer-aided designing/computer-aided manufacturing system
Author(s): Flávio Domingues das Neves; Thiago de Almeida Prado Naves Carneiro; Celio Jesus do Prado; Marcel Santana Prudente; Karla Zancopé; Letícia Resende Davi; Gustavo Mendonca; Carlos José Soares
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Paper Abstract

The current study evaluated prosthetic dental crowns obtained by optical scanning and a computer-aided designing/computer-aided manufacturing system using micro-computed tomography to compare the marginal fit. The virtual models were obtained with four different scanning surfaces: typodont (T), regular impressions (RI), master casts (MC), and powdered master casts (PMC). Five virtual models were obtained for each group. For each model, a crown was designed on the software and milled from feldspathic ceramic blocks. Micro-CT images were obtained for marginal gap measurements and the data were statistically analyzed by one-way analysis of variance followed by Tukey’s test. The mean vertical misfit was T=62.6±65.2  μm ; MC=60.4±38.4  μm ; PMC=58.1±38.0  μm , and RI=89.8±62.8  μm . Considering a percentage of vertical marginal gap of up to 75 μm , the results were T=71.5% , RI=49.2% , MC=69.6% , and PMC=71.2% . The percentages of horizontal overextension were T=8.5% , RI=0% , MC=0.8% , and PMC=3.8% . Based on the results, virtual model acquisition by scanning the typodont (simulated mouth) or MC, with or without powder, showed acceptable values for the marginal gap. The higher result of marginal gap of the RI group suggests that it is preferable to scan this directly from the mouth or from MC.

Paper Details

Date Published: 11 August 2014
PDF: 6 pages
J. Biomed. Opt. 19(8) 088003 doi: 10.1117/1.JBO.19.8.088003
Published in: Journal of Biomedical Optics Volume 19, Issue 8
Show Author Affiliations
Flávio Domingues das Neves, Univ. Federal de Uberlândia (Brazil)
Thiago de Almeida Prado Naves Carneiro, Univ. Federal de Uberlândia (Brazil)
Celio Jesus do Prado, Univ. Federal de Uberlândia (Brazil)
Marcel Santana Prudente, Univ. Federal de Uberlândia (Brazil)
Karla Zancopé, Univ. Federal de Uberlândia (Brazil)
Letícia Resende Davi, Univ. Federal de Uberlândia (Brazil)
Gustavo Mendonca, Univ. of Michigan (United States)
Carlos José Soares, Univ. Federal de Uberlândia (Brazil)

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