Co-Cr Material Selection in Prosthetic Restoration: Laser Sintering Technology

Abstract:

Selective laser sintering (SLS) is a manufacturing technique that uses a high power laser to fuse small particles of metal powders into a mass representing a desired 3-dimensional object. The topography of the dental restoration is designed by numerical monitoring after having scanned devised prostheses. In our application the alloy consists of 64-67% Co, 28-30% Cr and 5-6% Mo, and has at equilibrium of a γ monophasic structure. Evaluation and characterisation was made by: Microstructure analysis; Corrosion resistance evaluation; Polarization test; Crevice corrosion test; Release of cations. Dimensional observations of Co-Cr restorations show that adjustment leads to satisfactory clinical results with a precision of 25 μm. The metallographic observations show a slight porosity in the horizontal plan. Punctual analysis shows a high regularity of the local chemical composition. Potentiodynamic polarization curves confirm the presence of the porosity in the structure of the restoration. The technique of manufacturing by selective laser sintering allows obtaining prosthetic elements of high dimensional precision which present mechanical properties in agreement with the clinical requirements. However, the residual porosity inherent to the sintering process may present a risk for fracture and crevice corrosion.

• Periodical: Solid State Phenomena (Volume 188)
• Pages: 412-415
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.188.412
• Online since: May 2012
• Authors: Lucien Reclaru, Lavinia Ardelean, Laura Cristina Rusu, Cosmin Sinescu
• Keywords: Co-Cr Alloy, Laser Sintering, Prosthetic Restoration

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