title: Influence of dentin porcelain thickness on layered all-ceramic restoration color.
abstract: OBJECTIVE
  Final aesthetic performance of all-ceramic restorations is influenced by the thickness ratio of core and porcelain ceramics. This study aimed to identify and quantify the effect of increased dentin porcelain thickness on the color and color coordinates of all-ceramic specimens.
  
  
  METHODS
  Lava and IPS e.max Press all-ceramic systems were investigated. A1, A2 and A3.5 shades of layered specimens were made with 2-mm ceramic cores and 0-2mm bevelled dentin porcelain. Color was measured at 0.05mm dentin porcelain thickness intervals with a spectroradiometer. The effect of ceramic brand, shade and dentin porcelain thickness on color change was analyzed by 3-way ANOVA.
  
  
  RESULTS
  Color changes of layered ceramics varied by ceramic brand, shade and dentin porcelain thickness. For most ceramics, CIE a* and b* values gradually increased as the thickness of the dentin porcelain increased. Conversely, such increases in dentin porcelain thickness were correlated with decreasing CIE L* values. When compared with the IPS e.max Press ceramics, Lava ceramics showed smaller color changes in response to increases in dentin porcelain thickness.
  
  
  CONCLUSIONS
  The final appearance of ceramic restorations can be manipulated by varying the dentin porcelain thickness; however, the color of the layered ceramics varied by ceramic brand, shade and dentin porcelain thickness.
authors: Department of Dental Laboratory Science, College of Health Science, Korea University, Seoul, Republic of Korea.
authors: Ho-Jung
authors: HJ
authors: Son
authors: Woong-Chul
authors: WC
authors: Kim
authors: Sang-Ho
authors: SH
authors: Jun
authors: Young-Soo
authors: YS
authors: Kim
authors: Sung-Won
authors: SW
authors: Ju
authors: Jin-Soo
authors: JS
authors: Ahn
mesh_terms: D000704:Analysis of Variance; D003776:Dental Porcelain; D017267:Dental Prosthesis Design / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin; D004955:Esthetics, Dental; D006801:Humans; D017797:Prosthesis Coloring / Q000379:methods*
chemical_list: D003776:Dental Porcelain