Department of Buccofacial Prosthesis, University Complutense of Madrid, Madrid, Spain.
Int J Prosthodont. 2011 Mar-Apr;24(2):144-6.
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.
本研究旨在评估四种氧化锆基全瓷冠系统（In-Ceram Zirconia、In-Ceram YZ、Procera Zirconia 和 Cercon）中核心瓷和饰瓷的射线可透性。制备了 2 毫米厚的修复体切片，并与铝阶跃片一起进行数字化射线照相。图像分析程序将灰度数据转换为铝的毫米数。双因素方差分析检测到所有全瓷系统、层陶瓷以及这两个因素相互作用方面存在显著差异（P =.0001）。所有材料的射线可透性值均高于国际标准化组织推荐的最小值。
