title: Spectrophotometric evaluation of color match to VITA classical shade guide of four different veneering porcelain systems for metal ceramic restorations.
abstract: OBJECTIVE
  To determine by a spectrophotometric analysis the variations in color between the fabricated shade of four different porcelain systems and the intended shade when applied in a set thickness.
  
  
  METHODS
  Four porcelain systems (Duceram Kiss, VITA Omega, Wieland Reflex, Ivoclar IPS d.SIGN) for metal ceramic restorations were selected. Three disk-shaped (15 mm diameter, 0.3 mm thickness) specimens per group were made for three different shades of the A color scale of the Vitapan classical shade guide. On a Cr-Co alloy, 0.15 mm of porcelain opaque and 1.0 mm of translucent porcelain was applied. The porcelain stratification was executed according to the manufacturers' indications. The color measures were made by the clinical spectrophotometer Easyshade.
  
  
  RESULTS
  No statistically significant differences were found among the ceramic systems examined. The recorded differences in color between A2 porcelain disks and corresponding VITA shade tabs were closer (mean delta E = 2.50) than those recorded for shade A3 (mean delta E = 3.84) and shade A3.5 (mean delta E= 3.94) (P<0.05).
authors.affiliation: Department of Dental Materials, School of Dentistry, University of Siena, Italy. fazi_90211@yahoo.com
authors.forename: Giovanni
authors.initials: G
authors.lastname: Fazi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Vichi
authors.forename: Gabriele
authors.initials: G
authors.lastname: Corciolani
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D003116:Color / Q000592:standards*; D003124:Colorimetry / Q000379:methods; D003442:Crowns; D003776:Dental Porcelain; D003801:Dental Veneers; D016876:Metal Ceramic Alloys; D017797:Prosthesis Coloring; D013053:Spectrophotometry
chemical_list: D016876:Metal Ceramic Alloys; D003776:Dental Porcelain