title: Impact of background on color, transmittance, and fluorescence of leucite based ceramics.
abstract: This study evaluated the impact of tooth shade on differences in color (∆E), lightness (∆L), chromaticity coordinates a*/b* (∆a and ∆b), transmittance and the degree of fluorescence of CAD/CAM leucite based ceramic (LBC). Ten disks were fabricated of LBC; Empress CAD, A2, thickness of 1.5 mm and eight disks of resin-nano-ceramic (RNC; Lava Ultimate) in different colors to simulate variations in substrate shade. The associations of LBC disks with different color substrates were analyzed with a spectrophotometer; ∆E, ∆L*, ∆a*, ∆b*, and transmittance were measured and calculated. Fluorescence was evaluated with a fluorescence system (Fluorescence System, Biopdi). All substrate shades influenced the optical properties of LBC, with regard to color, luminosity, coordinate a* and b*, transmittance, and fluorescence (p<0.001). Substrate colors with high saturation (A3.5 and C2) presented highest impact, whereas colors with lowest saturations (BL, B1) showed less impact. Substrate color influenced the optical properties of ceramic restorations.
authors.affiliation: Department of Prosthodontics, Dental School, Ludwig-Maximilians University.|Department of Dentistry, Federal University of Santa Catarina.
authors.forename: Caroline Freitas
authors.initials: CF
authors.lastname: Rafael
authors.affiliation: Department of Prosthodontics, Dental School, Ludwig-Maximilians University.
authors.forename: Jan-Frederik
authors.initials: JF
authors.lastname: Güth
authors.affiliation: Department of Prosthodontics, Dental School, Ludwig-Maximilians University.
authors.forename: Ana Elisa Colle
authors.initials: AEC
authors.lastname: Kauling
authors.affiliation: Department of Biomaterials and Oral Biology, Sao Paulo University.
authors.forename: Paulo Francisco
authors.initials: PF
authors.lastname: Cesar
authors.affiliation: Department of Dentistry, Federal University of Santa Catarina.
authors.forename: Claudia Angelo Mazieiro
authors.initials: CAM
authors.lastname: Volpato
authors.affiliation: Department of Prosthodontics, Dental School, Ludwig-Maximilians University.
authors.forename: Anja
authors.initials: A
authors.lastname: Liebermann
mesh_terms: D002516:Ceramics; D003116:Color; D003124:Colorimetry; D003776:Dental Porcelain; D008422:Materials Testing
chemical_list: D003776:Dental Porcelain
keywords: Background shade; CAD/CAM materials; Fluorescence; Optical properties; Transmittance