Interactions between oral environment and dental alloys can impair metal framework of dental restorations, due to
corrosion compounds. The aim of the study was to determine corrosion resistance of dental Co-Cr alloys obtained by
modern technologies, as selective laser sintering (SLS) and selective laser melting (SLM), depending on microstructure,
pH and surface preparation. Materials and method: A commercial Co-Cr powder was used to prepare metallic plates both
SLS and SLM technologies. Relief-firing under argon was conducted, and also oxide-firing. All specimens were
polished. Half of them were air-blasted with 75 μm Al2O3 particles for ceramic veneering. Both polished and air-blasted
samples, were divided into three groups, and exposed to different pH solutions: 2, 7 and 11. The degree of corrosion
inhibition was determined for all specimens. Results: Lowest corrosion rate was observed in electrolyte with pH of 11,
and the highest in pH of 2. Surface roughness pay an essential role, proved by the higher corrosion rate of the surfaces
prepared for ceramic veneering. This is why corrosion behavior at metal-ceramic interfaces shows some particularities.
Conclusions: Loss of adhesion at metal-ceramic interface is accentuated by oral environment through the intervention of
corrosion on metal surfaces prepared for veneering.
The potential for fabricating metallic dental components directly from digital data using alternative technologies is a
topic of ongoing interest. The most recent developed procedures, like laser-based additive manufacturing methods
represent an excellent opportunity to increase their application in achieving dental restorations. Purpose: The objective of
the study was to assess the fracture behavior of metal-ceramic molar crowns obtained with laser-based additive
manufacturing methods related to other manufacturing procedures of the metallic frameworks. Materials and methods:
For the experimental analyses metal-ceramic crowns were prepared using alternative technologies for the frameworks:
traditional casting (CST), computerized milling (MIL), selective laser sintering (SLS) and selective laser melting (SLM).
These were veneered with specific hot-pressed ceramics. Crowns were cemented on duplicated composite dies and tested
under compressive load to fracture. Results: Maximal compressive loads were registered. The mean registered values
were 2432.93 N for CST, 1955.02 N for MIL, 2104.96 N for SLS and 2141.76 N for SLM. Higher variations between
the samples were registered for samples with frameworks obtained with additive manufacturing methods. Conclusion:
Application of laser-based additive manufacturing methods is currently a challenge in dental alloys processing. The
mechanical behavior of metal-ceramic crowns obtained with different manufacturing technologies is important from
clinical point of view and should be related to other structural and morphological characteristics of the frameworks.
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