Microstructural, mechanical, ionic release and tarnish resistance characterization of porcelain fused to metal Co-Cr alloys manufactured via casting and three different CAD/CAM techniques.

Purpose: To perform a comparative analysis of the microstructure, porosity, mechanical properties, corrosion, and tarnish resistance of Co-Cr alloys prepared by casting and three different computer aided designed/computer aided manufacturing (CAD/CAM) techniques.

Methods: Four groups of metallic specimens were prepared, one each by conventional casting (CST), milling (MIL), selective laser melting (SLM), and milling soft metal (MSM). Ten samples were tested by X-rays, after which their microstructure and elemental composition were tested by scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX) analysis.

The effect of simulating porcelain firing on the elemental composition, microstructure, and mechanical properties of electroformed gold restorations.

Background/purpose: The mechanical properties of pure gold (Au) are modified by thermal treatments. Thus, the aim of this study was to evaluate the effect of porcelain firing on the elemental composition, microstructure, and mechanical properties of electroformed Au crowns.

Materials And Methods: Twenty electroformed Au specimens were prepared and divided into two groups.