title: Translucency of varied brand and shade of resin composites.
abstract: OBJECTIVE
  To measure and classify the translucency of varied brands and shades of resin composites.
  
  
  METHODS
  Eight light-curing resin composites, with a total of 41 shades, were investigated. The color of specimens, 12 mm in diameter and 1 mm in thickness, was measured after polymerization on a reflection spectrophotometer with the SCE geometry under the illuminant D65 over white and black backgrounds. The translucency parameter (TP) and contrast ratio (CR) were calculated and compared. The influence of shade on TP values in each brand of resin composites was analyzed with one-way ANOVA.
  
  
  RESULTS
  The range of TP values varied from 8.5 to 20.6, which was significantly influenced by the shade designation of resin composites (P < 0.05). In each brand, TP values varied by the shade designation. The range of mean translucency parameter value by the shade group, such as A1, A2, A3, A3.5 and B2 group, was 15.4 to 17.2. Translucency parameter was highly correlated with mean contrast ratio value (r = -0.84).
authors.affiliation: Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
authors.forename: Bin
authors.initials: B
authors.lastname: Yu
authors.forename: Yong-Keun
authors.initials: YK
authors.lastname: Lee
mesh_terms: D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D008029:Lighting; D008422:Materials Testing; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry; D013053:Spectrophotometry; D013499:Surface Properties
chemical_list: C520091:CeramX; D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; C444701:Filtek Z250; C470230:Gradia; C509998:Grandio; D011108:Polymers; C471182:glacier hybrid composite; C451741:point 4 composite resin; C507210:premise composite resin