title: Color variation between matched and fabricated shades of different ceramics.
abstract: OBJECTIVE
  The aim of this study was to evaluate and compare the total color difference (ΔE) between natural teeth and fabricated crowns from three ceramic systems with different thicknesses.
  
  
  METHODS
  The color of ninety maxillary central incisors was measured from the middle third of the labial surface with a Vita Easyshade spectrophotometer. All-ceramic crown preparations with different thicknesses (0.8, 1.2, 1.5 mm) were done on selected teeth (n = 30). Prepared teeth were randomly divided into three equal groups to fabricate ceramic crowns from three ceramic systems, Duceram LFC (DLFC), In-Ceram SPINELL (ICS), and IPS Empress (IPSE). Colors of cemented crowns were measured and compared with their corresponding measurements before preparations. Data were statistically analyzed using two-way ANOVA at 5% significance level.
  
  
  RESULTS
  A significant difference of ΔE was detected between natural teeth and different thicknesses of crowns constructed from the all-ceramic materials investigated. Comparing the three materials at 0.8 mm thickness revealed that the lowest ΔE was recorded for DLFC, which was significantly different from the other ceramic systems while IPSE showed the highest ΔE. At higher thicknesses there was no difference between natural tooth shade and crowns constructed from different ceramic materials.
  
  
  CONCLUSIONS
  Reinforcement of ceramics by alumina for In-Ceram and leucite for Empress decreases color production. Level of acceptance between the different ceramic materials and thicknesses varied. DLFC showed the highest color matching at all thicknesses followed by ICS and IPSE in descending order. In general, increasing the thickness of fabricated crowns enhances color match.
authors: Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
authors: Motaz Ahmed
authors: MA
authors: Ghulman
authors: Mohamed Abdelmageed
authors: MA
authors: Awad
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D002484:Cementation / Q000379:methods; D003116:Color; D003442:Crowns; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology; D008277:Magnesium Oxide / Q000737:chemistry; D017797:Prosthesis Coloring; D013053:Spectrophotometry; D013499:Surface Properties; D019228:Tooth Crown / Q000033:anatomy & histology
chemical_list: D000538:Aluminum Silicates; C095718:Duceram; C075815:IPS-Empress ceramic; C111130:spinell; D003776:Dental Porcelain; C078519:leucite; D008277:Magnesium Oxide; D000537:Aluminum Oxide
keywords: Ceramic systems; color measurements; shade selection; spectrophotometer