title: Colorimetric analysis as a means of quality control for dental ceramic materials.
abstract: In this in-vitro study colorimetric analysis using the CIELAB-system was applied to two all-ceramic materials in shades A1 and A2. The material for the 96 specimens was taken from three production batches and examined spectrophotometrically after firing. For both materials the firing-process led to only small colour differences (average DE-value < 2.2). Between the three batches of each material, significantly higher, visually perceivable colour differences were detected. The results revealed that the Castor system is capable of producing high-precision colour measurements. The use of spectrophotometric devices is recommended as a means of quality control in order to decrease colour tolerances between different batches of the same material.
authors.affiliation: Georg-August-Universität, Zentrum für ZMK-Heilkunde, Abt. Prothetik II, Göttingen, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Rinke
authors.forename: A
authors.initials: A
authors.lastname: Hüls
authors.forename: M J
authors.initials: MJ
authors.lastname: Kettler
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D000704:Analysis of Variance; D003124:Colorimetry / Q000295:instrumentation; D003776:Dental Porcelain / Q000737:chemistry* / Q000592:standards*; D005069:Evaluation Studies as Topic; D017797:Prosthesis Coloring / Q000592:standards*; D011786:Quality Control; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000295:instrumentation; D018709:Statistics, Nonparametric
chemical_list: D000538:Aluminum Silicates; C075815:IPS-Empress ceramic; D003776:Dental Porcelain; C058236:Vitadur N; D000537:Aluminum Oxide