title: [Color determination in dental ceramics].
abstract: Determining the appropriate color of an esthetic restoration is an important step in dental treatment. In this study instead of a shade guide the validity of a recently available objective colorimeter Castor has been investigated. A porcelain-fused-to-metal porcelain (PFM) (Biodent B2), the sinter-porcelain Mark II and the glass-porcelain Dicor have been spectrometrically studied, as well as a Vita shade guide. The Castor equipment has been used for all measurements. The lightness (L*) of the PFM porcelain was not altered by the glaze firing, whereas the red-green-values (a*) tended towards red and the blue-yellow-values towards blue. Total color value (E*) and lightness (L*) of Mark II and Dicor decreased with rising thickness of the samples. At and above a thickness of 1.5 mm, the background had only marginal influence on the L*a*b*-values. It was noticed, that the order by decreasing lightness within the shade guide did not meet official manufacturer declarations, whereas color intensity correlated evidently with the specification. The Castor equipment for color determination is an interesting innovation in dentistry. For the first time and in an economic reasonable frame it permits objective evaluation of color characteristics, such as lightness (L*), red-green (a*) and yellow-blue (b*).
authors.affiliation: Klinik für Zahn-, Mund- und Kieferkrankheiten, Medizinische Fakultät, Johannes-Gutenberg-Universität, Mainz.
authors.forename: M A
authors.initials: MA
authors.lastname: Baumann
authors.forename: B
authors.initials: B
authors.lastname: Schifferdecker
mesh_terms: D003116:Color / Q000592:standards; D003779:Denture Design / Q000295:instrumentation; D006801:Humans; D016876:Metal Ceramic Alloys; D017797:Prosthesis Coloring / Q000295:instrumentation
chemical_list: D016876:Metal Ceramic Alloys
vernacular_title: Farbbestimmung bei Dentalkeramiken.