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metadata.dc.type: Article
Title: UV-Vis spectrophotometric analysis and light irradiance through hot-pressed and hot-pressed-veneered glass ceramics
Authors: Dias, Myrna Carvalho
Piva, Evandro
Moraes, Rafael Ratto de
Ambrosano, Glaucia Maria Bovi
Sinhoreti, Mário Alexandre Coelho
Abstract: This study evaluated the irradiance of curing units through core and veneered hot-pressed ceramics as well as the transmittance of these materials. Discs of 0.7, 1.4 and 2 mm in thickness of Empress (EMP) and Empress Esthetic (EST), and 0.8 (n=5) and 1.1 mm (n=5)thickness of Empress 2 (E2) were obtained. For E2, two of the 0.8-mm-thick discs were covered with dentin (1.2- and 1.4-mm-thick)and two with dentin + enamel (1.5-mm-thick). The 1.1-mm-thick specimens were submitted to the same veneering procedures. Specimens were evaluated by UV-Vis transmittance analysis and the percentage of transmittance was recorded. Irradiance through each specimen was evaluated with a quartz-tungsten-halogen (QTH), used in continuous or intermittent exposure modes, or a blue lightemitting diode (LED). Data were analyzed by Dunnett’s test, ANOVA and Tukey’s test at 5% significance level. Exposure through ceramic decreased the irradiance for all ceramics. Irradiance through EST was significantly higher than through EMP. For E2, reduction in irradiance depended on the core and/or veneer thickness. The QTH intermittent mode showed higher irradiance than the continuous mode, and both showed higher irradiance than LED. The ceramic significantly influenced irradiance and transmittance, which were found to decrease with the increase in thickness.
Keywords: Ceramic
Dental materials
Light-curing units
Publisher: Dental Foundation of Ribeirão Preto
Citation: DIAS, Myrna Carvalho; PIVA, Evandro; MORAES, Rafael Ratto de; AMBROSANO, Gláucia Maria Bovi; SINHORETI, Mário Alexandre Coelho; CORRER SOBRINHO, Lourenço. UV-Vis spectrophotometric analysis and light irradiance through hot-pressed and hot-pressed-veneered glass ceramics. Brazilian Dental Journal, v. 19, p. 197-203, 2008.
Issue Date: 2008
Appears in Collections:Departamento de Odontologia Restauradora: Artigos de periódicos

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