Co-Cr based alloys usually produced by conventional casting or newly by direct metal laser sintering (DMLS) have been widely used in dentistry as dental prostheses. This work is focused on the powder size and chemical composition of initial powder particles of a commercial Co-Cr based alloy, as well as on the microstructure after DMLS and heat treatment. Material used in this study is a Co-Cr-Mo-W based alloy in a fine powder form (EOS Cobalt Chrome SP2 type). Its composition corresponds to type 4 CoCr dental materials in EN ISO 22674:2006 standard. It also fulfils the chemical and thermal requirements of EN ISO 9693 for CoCr PFM (porcelain fused metal). In order to solve the problem of porosity and shape stability of prostheses after high temperature annealing, microstructure and phase evaluation using optical and scanning electron microscopies completed by EDX analysis were performed.Keywords: CoCr alloys, direct metal laser sintering, heat treatment, microstructure, porosity
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