title: Influence of type of cement on the color and translucency of monolithic zirconia.
abstract: BACKGROUND
  With the development of translucent zirconia, questions regarding the influence of cements on the final color of monolithic zirconia restorations have arisen.
  
  
  OBJECTIVE
  The purpose of this in vitro study was to evaluate color changes in terms of the perceptibility and acceptability of monolithic zirconia-and-cement combinations with 2 monolithic zirconia thicknesses and 3 types of cement. The translucency parameters of these combinations were also compared.
  
  
  METHODS
  Sixty monolithic zirconia ceramic disks were milled with 2 different thicknesses (0.6 mm and 1 mm). A conventional glass ionomer cement, a resin-modified glass ionomer cement, and a resin cement from the same manufacturer were applied to the ceramic surfaces of both thickness disks (n=10). Translucencies and color changes of the monolithic zirconia specimens after cement application were examined by using a spectrophotometer, and translucency parameters (TPs) and color changes (ΔEs) were calculated and statistically analyzed.
  
  
  RESULTS
  Colors and TPs of the zirconia disks changed significantly after being cemented to 0.6- and 1-mm-thick disks (P<.05). The lowest ΔE values (3.53 for the 0.6-mm and 2.23 for the 1-mm thick disks) were observed for the zirconia-resin modified glass ionomer combination, whereas the highest ΔE values (5.64 for the 0.6-mm and 5.06 for the 1-mm thick disks) were observed for the zirconia-resin cement combination. The glass ionomer cement most strongly affected the TP values of both of the thicknesses.
  
  
  CONCLUSIONS
  Cement types and zirconia thickness affected the colors and translucencies of the monolithic zirconia specimens.
authors.affiliation: Associate Professor, Department of Prosthodontics, Yeditepe University, Istanbul, Turkey. Electronic address: ozlemmalkondu@gmail.com.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Malkondu
authors.affiliation: Lecturer, Department of Prosthodontics, University of Yeditepe, Istanbul, Turkey.
authors.forename: Neslihan
authors.initials: N
authors.lastname: Tinastepe
authors.affiliation: Professor, Department of Prosthodontics, University of Yeditepe, Istanbul, Turkey.
authors.forename: Ender
authors.initials: E
authors.lastname: Kazazoglu
mesh_terms: D000704:Analysis of Variance; D003116:Color; D003738:Dental Cements; D066298:In Vitro Techniques; D008422:Materials Testing; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003738:Dental Cements; D015040:Zirconium; C028541:zirconium oxide