11 August 2014 Micrometric precision of prosthetic dental crowns obtained by optical scanning and computer-aided designing/computer-aided manufacturing system
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J. of Biomedical Optics, 19(8), 088003 (2014). doi:10.1117/1.JBO.19.8.088003
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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
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, "Micrometric precision of prosthetic dental crowns obtained by optical scanning and computer-aided designing/computer-aided manufacturing system," Journal of Biomedical Optics 19(8), 088003 (11 August 2014). http://dx.doi.org/10.1117/1.JBO.19.8.088003
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KEYWORDS
Teeth

Computing systems

Optical scanning

Optics manufacturing

Mouth

Atmospheric modeling

Ceramics

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