title: Accuracy of ceramic restorations made with two CAD/CAM systems.
abstract: BACKGROUND
  Different types of CAD/CAM systems are currently available, but information regarding which system produces the best marginal fit is lacking.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the effect of 2 different CAD/CAM systems (Cerec inLab, Kavo Everest) on the marginal fit of 2 types of zirconia-based and lithium disilicate crowns.
  
  
  METHODS
  Forty zirconia-based and lithium disilicate crowns, 20 each, were fabricated with the Cerec inLab and Everest CAD/CAM systems on a specially designed stainless steel die to ensure the standardization of specimen shape and dimensions. The vertical marginal fit for all tested crowns was evaluated by using a digital microscope at ×100 magnification, and the data were tabulated and statistically analyzed with 2-way ANOVA, followed by the Tukey honestly significant difference (HSD) test with a confidence level of .05 to determine the mean differences.
  
  
  RESULTS
  The results showed that the CAD/CAM technique, ceramic type, and their interaction had a statistically significant effect on the mean marginal fit of both ceramic types tested.
  
  
  CONCLUSIONS
  Better marginal fit values were exhibited by the Everest CAD/CAM technique for both ceramic types tested.
authors: Crown and Fixed Prosthodontics Department, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt. drtamerhamza@hotmail.com
authors: Tamer A
authors: TA
authors: Hamza
authors: Hesham A
authors: HA
authors: Ezzat
authors: Mohamed Mahmoud Khalil
authors: MM
authors: El-Hossary
authors: Hesham Abd El Megid
authors: HA
authors: Katamish
authors: Tamer E
authors: TE
authors: Shokry
authors: Stephen F
authors: SF
authors: Rosenstiel
mesh_terms: D017076:Computer-Aided Design / Q000592:standards*; D003442:Crowns / Q000592:standards*; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design / Q000592:standards*; D006801:Humans; D008853:Microscopy / Q000295:instrumentation; D003765:Models, Dental; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic; D015019:Yttrium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: C520133:IPS e.max CAD LT; C493120:lithia disilicate; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D013193:Stainless Steel; D015019:Yttrium; D015040:Zirconium; C028541:zirconium oxide