RESEARCH AND EDUCATION
Quantification of the amount of blue light passing through monolithic zirconia with respect to thickness and polymerization conditions Nicoleta Ilie, Prof Dr rer Biol Hum Dipl Inga and Bogna Stawarczyk, Dr rer Biol Hum Dipl Ingb Prospective studies have ABSTRACT shown reliable clinical results of Statement of problem. Dual-polymerized luting composite resin cements would benefit from 3- and 4-unit partial fixed enhanced irradiance transmitted through a ceramic restoration. A quantification of the amount of dental prostheses (FDPs) with transmitted light through translucent zirconia is lacking. frameworks made of zircoPurpose. The purpose of this study was to evaluate the amount of light (360 to 540 nm) passing nia.1,2 The only problems through translucent and conventional zirconia and a glass ceramic with respect to material thickencountered were fractures of ness and different polymerizing modes. the veneering ceramic (chipMaterial and methods. Six translucent and a conventional zirconia (negative control) and a glass ping) and decementations.1,2 ceramic (positive control) were considered. Ten specimens of each material and thickness (.5, 1, 1.5, To avoid such complications, 2, 2.5, 3 mm) were fabricated (n=480). Zirconia materials were sintered according to manufacturers’ the use of hybrid-structure instructions. The irradiance passing the different ceramics and thicknesses was measured with a FDPs comprising computerviolet-blue LED polymerizing unit in 3 polymerizing modes (plasma, high, and standard power mode) with a USB4000 Spectrometer. The polymerizing unit was placed directly on the aided design and computerspecimen’s surface. Data were analyzed with one and multivariate analysis and the Pearson aided manufacturing (CAD/ correlation analysis (a=.05). CAM) porcelain parts adhering to a CAD/CAM zirconia Results. In all materials, the translucency and its rate decreased exponentially according to the specimen thickness. The highest influence on the measured irradiance passing through translucent framework or of anatomic zirconia was exerted by ceramic thickness (P
Quantification of the amount of blue light passing through monolithic zirconia with respect to thickness and polymerization conditions Nicoleta Ilie, Prof Dr rer Biol Hum Dipl Inga and Bogna Stawarczyk, Dr rer Biol Hum Dipl Ingb Prospective studies have ABSTRACT shown reliable clinical results of Statement of problem. Dual-polymerized luting composite resin cements would benefit from 3- and 4-unit partial fixed enhanced irradiance transmitted through a ceramic restoration. A quantification of the amount of dental prostheses (FDPs) with transmitted light through translucent zirconia is lacking. frameworks made of zircoPurpose. The purpose of this study was to evaluate the amount of light (360 to 540 nm) passing nia.1,2 The only problems through translucent and conventional zirconia and a glass ceramic with respect to material thickencountered were fractures of ness and different polymerizing modes. the veneering ceramic (chipMaterial and methods. Six translucent and a conventional zirconia (negative control) and a glass ping) and decementations.1,2 ceramic (positive control) were considered. Ten specimens of each material and thickness (.5, 1, 1.5, To avoid such complications, 2, 2.5, 3 mm) were fabricated (n=480). Zirconia materials were sintered according to manufacturers’ the use of hybrid-structure instructions. The irradiance passing the different ceramics and thicknesses was measured with a FDPs comprising computerviolet-blue LED polymerizing unit in 3 polymerizing modes (plasma, high, and standard power mode) with a USB4000 Spectrometer. The polymerizing unit was placed directly on the aided design and computerspecimen’s surface. Data were analyzed with one and multivariate analysis and the Pearson aided manufacturing (CAD/ correlation analysis (a=.05). CAM) porcelain parts adhering to a CAD/CAM zirconia Results. In all materials, the translucency and its rate decreased exponentially according to the specimen thickness. The highest influence on the measured irradiance passing through translucent framework or of anatomic zirconia was exerted by ceramic thickness (P
