title: Micrometric precision of prosthetic dental crowns obtained by optical scanning and computer-aided designing/computer-aided manufacturing system.
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.
authors.affiliation: Federal University of Uberlândia, Department of Occlusion, Fixed Prostheses and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Flávio Domingues
authors.initials: FD
authors.lastname: das Neves
authors.affiliation: Federal University of Uberlândia, Department of Occlusion, Fixed Prostheses and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Thiago
authors.initials: T
authors.lastname: de Almeida Prado Naves Carneiro
authors.affiliation: Federal University of Uberlândia, Department of Occlusion, Fixed Prostheses and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Célio Jesus
authors.initials: CJ
authors.lastname: do Prado
authors.affiliation: Federal University of Uberlândia, Department of Occlusion, Fixed Prostheses and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Marcel Santana
authors.initials: MS
authors.lastname: Prudente
authors.affiliation: Federal University of Uberlândia, Department of Occlusion, Fixed Prostheses and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Karla
authors.initials: K
authors.lastname: Zancopé
authors.affiliation: Federal University of Uberlândia, Department of Occlusion, Fixed Prostheses and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Letícia Resende
authors.initials: LR
authors.lastname: Davi
authors.affiliation: University of Michigan, School of Dentistry, Department of Biologic and Material Sciences, Division of Prosthodontics, 1011 N. University, Ann Arbor, Michigan 48109-1078, United States.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Mendonça
authors.affiliation: Federal University of Uberlândia, Department of Operative Dentistry and Dental Materials, Av. Pará, 1720, Bloco 4LA sala 4LA-42, Campus Umuarama, 38405-320, Uberlândia, Minas Gerais, Brazil.
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
mesh_terms: D001641:Bicuspid / Q000033:anatomy & histology* / Q000601:surgery; D017076:Computer-Aided Design / Q000295:instrumentation*; D003442:Crowns; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design / Q000295:instrumentation*; D019544:Equipment Failure Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D066330:Printing, Three-Dimensional / Q000295:instrumentation; D017755:Prosthesis Fitting / Q000295:instrumentation*; D011861:Radiography, Dental / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity