title: Colour and translucency of opaque-shades and body-shades of resin composites.
abstract: The purpose of this study was to evaluate the optical properties--not only the translucency but also the colours--of opaque-shade resin composites. The CIELAB parameters (L*, a* and b*) of disks of A2 and opaque A2 (OA2) shades of Charisma (Heraeus-Kulzer), Solare (GC) and Filtek Supreme (3M) were evaluated on backings of black, white and the material itself to calculate the translucency parameter (TP) and the colour differences (delta E*) between A2 and OA2. A two-way analysis of variance (anova) for the TP indicated a less statistically significant TP value in the OA2 shade than the A2 shade for all products. As for the products, Charisma showed a statistically greater TP value than the other two products. Regarding the delta E* between A2 and OA2, all the products revealed clinically perceptible colour differences (delta E* > 3.3). Hence, we must take the colour differences of opaque-shade resin composites into consideration, as well as the translucency of the materials, for a clinically acceptable colour match of the restoration.
authors.affiliation: Section of Cariology, Operative Dentistry and Endodontology, Department of Oral Health Science, Hokkaido University, Graduate School of Dental Medicine, Kita Nishi, Sapporo, Japan. iketaka@den.hokudai.ac.jp
authors.forename: Takatsumi
authors.initials: T
authors.lastname: Ikeda
authors.forename: Sharanbir K
authors.initials: SK
authors.lastname: Sidhu
authors.forename: Yo
authors.initials: Y
authors.lastname: Omata
authors.forename: Megumi
authors.initials: M
authors.lastname: Fujita
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Sano
mesh_terms: D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D055095:Optics and Photonics
chemical_list: C084111:Charisma composite resin; D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; C501838:Solare