title: [Effect of thickness and shade of porcelain of ceramometal restorations on color of gingival porcelain].
abstract: OBJECTIVE
  The purpose of this study was to evaluate the color changes of gingival porcelain through varying thickness and shade of porcelain of ceramometal restorations.
  
  
  METHODS
  In this study a spectrophotometer (PR-650) was used for color analysis. The color changes of dentin porcelain and gingival porcelain with three varied thickness (0.3 mm, 0.6 mm and 0.9 mm) were investigated. In addition, the color variances of Shofu vintage porcelain shade A2, A3 and B2 were tested.
  
  
  RESULTS
  The results showed that decreased L * value of ceramometal restorations and increased a * value were due to the increase of the gingival porcelain thickness, color measurements showed the same trend as the increased dentin porcelain thickness and the opaque and dentin porcelain with different color affected the appearance of gingival porcelain.
  
  
  CONCLUSIONS
  The color of gingival porcelain would be changed with the differences of thickness and shade of porcelain of ceramometal restorations.
authors.affiliation: Key Laboratory of Oral Biomedical Engineering Ministry of Education, Sichuan University, Chengdu 610041, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Sun
authors.forename: Yun
authors.initials: Y
authors.lastname: Luo
authors.forename: Yong-Lie
authors.initials: YL
authors.lastname: Chao
mesh_terms: D003116:Color; D003776:Dental Porcelain; D006801:Humans; D017797:Prosthesis Coloring; D013053:Spectrophotometry
chemical_list: C096474:Vintage Porcelain; D003776:Dental Porcelain