title: A comparison of three-dimensional marginal adaptation among three all-ceramic crown systems.
abstract: OBJECTIVE
  This study was to compare the marginal adaptation of single crown made of 3 different all-ceramic systems (IPS e.max, In-Ceram alumina, Kavo Everest) in vitro using a light-body silicone supported by a heavy-body silicone material.
  
  
  METHODS
  The crowns were made for 1 extracted maxillary premolar prepared with a 0.8-mm chamfer margin and 6-degree tapered walls by milling. Ten crowns per system were fabricated. The horizontal marginal discrepancies, vertical marginal discrepancies and absolute marginal discrepancies were measured under an optical microscope at 39.2 magnification. The data were analyzed with one-way analysis of variance (ANOVA) using SPSS 13.0 software package.
  
  
  RESULTS
  The results showed the mean values for horizontal marginal discrepancies were between 41.1μm and 44.9μm, for vertical marginal discrepancies were between 51.4μm and 71.7μm, and for absolute marginal discrepancies were between 66.2μm and 85.1μm.
  
  
  CONCLUSIONS
  The horizontal marginal discrepancies, vertical marginal discrepancies and absolute marginal discrepancies of the three all-ceramic crown systems were within the clinically acceptable standard. However, the IPS e.max system and the Kavo Everest System showed a better marginal fit compared with the In-Ceram alumina system.
authors: Department of General Dentistry, Jilin University. Changchun,China. zhangyan330201@126.com
authors: Yan
authors: Y
authors: Zhang
authors: Jiang
authors: J
authors: Li
authors: Xiao-qin
authors: XQ
authors: Xue
authors: Zhen-yu
authors: ZY
authors: Chen
authors: Xiao-ju
authors: XJ
authors: Li
mesh_terms: D001641:Bicuspid; D002516:Ceramics; D003442:Crowns; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D017267:Dental Prosthesis Design
chemical_list: C483026:In-Ceram Alumina; D003776:Dental Porcelain