Micrometric precision of prosthetic dental crowns obtained by optical scanning and computer-aided designing/computer-aided manufacturing system

作者：das Neves Flavio Domingues^*; Prado Naves Carneiro Thiago de Almeida; do Prado Celio Jesus; Prudente Marcel Santana; Zancope Karla; Davi Leticia Resende; Mendonca Gustavo; Soares Carlos Jose

来源：Journal of Biomedical Optics, 2014, 19(8): 088003.

DOI：10.1117/1.JBO.19.8.088003

• computer-aided designing/computer-aided manufacturing
• CEREC Vita blocks
• ceramics
• micro-computed tomography
• marginal fit
• dental materials
• optical devices

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 mu m; MC = 60.4 +/- 38.4 mu m; PMC = 58.1 +/- 38.0 mu m, and RI = 89.8 +/- 62.8 mu m. Considering a percentage of vertical marginal gap of up to 75 mu m, 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.

• 出版日期2014-8