title: Color and translucency in silorane-based resin composite compared to universal and nanofilled composites.
abstract: OBJECTIVE
  The purpose of this study was to determine the optical properties, color and translucency, of the new silorane-based resin composite and to compare it to universal dimethacrylate-based composites.
  
  
  METHODS
  Six dimethacrylate-based resin composites and one silorane-based resin composite (all A2 shade) were studied. Color of non-polymerized and polymerized composites was measured against white and black backgrounds using a spectroradiometer. Changes in color (ΔE*(ab)), translucency (ΔTP) and color coordinates (ΔL*, Δa* and Δb*) were calculated for each resin composite. Results were evaluated using a one-way ANOVA, a Tukey's test and a t-test.
  
  
  RESULTS
  The polymerization-dependent ΔE*(ab) ranged from 4.7 to 9.1, with the smallest difference for the silorane-based resin composite. The color changes of silorane-based composite were due to the changes of coordinates Δa* and Δb*. However, for the dimethacrylate-based composites, the color changes mainly originated by ΔL*and Δb*. The silorane composite exhibited the smallest TP values. Tukey's test confirmed significant statistical differences (p<0.05) between mean TP values of Filtek Silorane and each brand of dimethacrylate-based composites before and after polymerization.
  
  
  CONCLUSIONS
  The new silorane-based restorative system showed different optical properties compared to clinically successful dimethacrylate composites. The silorane composite exhibited better polymerization-dependent chromatic stability, and a lower translucency compared to other tested products.
authors.affiliation: Department of Optics, Faculty of Science, University of Granada, Campus Fuentenueva, Granada, Spain. mmperez@ugr.es
authors.forename: María M
authors.initials: MM
authors.lastname: Pérez
authors.forename: Razvan
authors.initials: R
authors.lastname: Ghinea
authors.forename: Laura I
authors.initials: LI
authors.lastname: Ugarte-Alván
authors.forename: Rosa
authors.initials: R
authors.lastname: Pulgar
authors.forename: Rade D
authors.initials: RD
authors.lastname: Paravina
mesh_terms: D000704:Analysis of Variance; D003116:Color; D003188:Composite Resins / Q000737:chemistry* / Q000145:classification / Q000528:radiation effects; D003764:Dental Materials / Q000737:chemistry / Q000145:classification / Q000528:radiation effects; D003793:Dental Restoration, Permanent / Q000379:methods*; D005027:Ethylene Oxide / Q000737:chemistry / Q000528:radiation effects; D008027:Light; D008689:Methacrylates / Q000737:chemistry / Q000528:radiation effects; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D017797:Prosthesis Coloring; D062047:Silorane Resins; D012833:Siloxanes / Q000737:chemistry* / Q000528:radiation effects; D018709:Statistics, Nonparametric
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D011108:Polymers; D062047:Silorane Resins; D012833:Siloxanes; C555513:silorane composite resin; D005027:Ethylene Oxide