Objectives: Numerous all-ceramic materials are now available for dental applications. The purpose of this study was to evaluate the vertical and horizontal marginal gap widths in crown copings produced using different types of materials – porcelain-fused-to-metal (PFTM, Argelite 80SF+, Argen Co., CA), Empress Eris (EI, Ivoclar Vivadent, NY), and Cerec inLab (Sirona). Methods: A metal abutment was fabricated with a 1 mm marginal width, 4 mm height, and 12 degrees convergence angle. Ten Empress Eris, 10 PFTM, 30 Cerec inLab alumina and 30 Cerec inLab zirconia crown copings were fabricated by a commercial laboratory. Epoxy resin replicas of the abutment and copings were developed, embedded in acrylic resin and sectioned occluso-cervically at right angles into four segments. Vertical and horizontal marginal gap widths in microns were measured on both faces of each segment with Micro-Vu (Windsor, CA). Descriptive statistics and one-way ANOVA were performed for both vertical and horizontal gap widths between materials (α=.05). Result: Mean (s.d.) vertical and horizontal gap widths of alumina (40.3±14.2; 16.1±15.5) were similar to those of zirconia (35.7±13.8; 19.1±12.5). Mean (s.d.) vertical and horizontal gap widths for PFTM (59.0±28.1; 73.8±20.9) and Empress Eris (79.1±28.1; 166.1±57.6) were significantly higher (P<.0001) than the alumina and zirconia specimens. Conclusion: These results demonstrated that alumina and zirconia copings manufactured with CAD-CAM technology produced vertical and horizontal marginal gap widths superior to those of PFTM and Empress Eris copings.

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