Laser Powder Bed Fusion of Co-Cr and Ti Alloys : A Review of Microstructure, Mechanical Properties, and Clinical Fit Accuracy of Denture Frameworks

This study comprehensively reviewed the current literature on Co-Cr and Ti alloys produced by laser-beam powder-bed fusion (PBF-LB), focusing on their microstructures, mechanical properties, and the fitness and dimensional accuracy of removable partial denture (RPD) frameworks. The microstructures fabricated by PBF-LB differ significantly from those of conventionally cast alloys due to the rapid cooling rate during fabrication in both Co-Cr and Ti-6Al-4V alloys. Additionally, residual stress is generated during the fabrication process, making heat treatment essential to relieve this stress. The optimal heat treatment conditions vary depending on the type of dental prosthesis. Although the mechanical properties of alloys are influenced by heat treatment conditions, the mechanical strength of the Co-Cr alloy fabricated by PBF-LB was found to be superior to that of conventionally cast.