Abstract
The swaged metal matrix provides a method for rapidly making a metal substructure for ceramic crowns. This study determined the vertical and horizontal marginal fidelity of swaged metal substrate crowns made with four methods. No significant difference in vertical or horizontal marginal fidelity was found for metal margin crowns formed with either a plastic spacer or a paint-on die spacer. The vertical marginal fidelity was significantly better in crowns made with a metal margin (37 μm) than in crowns made with a porcelain facial margin (62 μm), and the latter were significantly better than crowns made with a 360-degree porcelain margin (86 μm). Crowns made with all four methods were overcontoured by 46 to 82 μm. The 360-degree porcelain margin was technically more difficult and time-consuming to make.
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