Coping Prep Guide- Send us your trimmed master die for single-unit copings (die should be slightly ditched to allow for optimal scanning). Or, include opposing models with bite registration for multiple-unit copings, bridge frameworks or dies that require additional build-up for porcelain support. DO NOT mark margin, use die spacer, die seal or block-out wax. When your case arrives, our experienced technicians work off your master die to scan, design and mill your copings using CAD/CAM technology. The final milled copings exhibit ideal porcelain support, acute marginal accuracy, and are shaded and ready for ceramic application.