title: Radiopacity of zirconia-based all-ceramic crown systems.
abstract: The aim of this study was to evaluate the radiopacity of the core and veneer ceramics in four zirconia-based crown systems: In-Ceram Zirconia, In-Ceram YZ, Procera Zirconia, and Cercon. Two-millimeter-thick restoration slices were prepared and digitally radiographed alongside an aluminum stepwedge. The grayscale data were converted into millimeters of aluminum by an image analysis program. The two-way analysis of variance test detected significant differences with respect to all-ceramic system, layer ceramic, and the interaction of the two factors (P = .0001). All materials presented radiopacity values above the minimum recommended by the International Organization for Standardization.
authors.affiliation: Department of Buccofacial Prosthesis, University Complutense of Madrid, Madrid, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Martinez-Rus
authors.forename: Ana M
authors.initials: AM
authors.lastname: Garcia
authors.forename: Antonio H
authors.initials: AH
authors.lastname: de Aza
authors.forename: Guillermo
authors.initials: G
authors.lastname: Pradies
mesh_terms: D000535:Aluminum / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry; D003287:Contrast Media; D003442:Crowns; D003720:Densitometry; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008422:Materials Testing; D011176:Post and Core Technique; D019252:Radiography, Dental, Digital / Q000379:methods; D015019:Yttrium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003287:Contrast Media; C485633:In-Ceram Zirconia; C556625:VITA VM7; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium; D000535:Aluminum; C028541:zirconium oxide