Dr. Cosmin M. Cotrut, Associate Professor, Department of Metallic Materials Science, Faculty of Material Science and Engineering, University Politehnica of Bucharest, Physical Metallurgy, 313, Splaiul Independenei street, Building J, 060042 - Bucharest, Romania

Biography: Dr. Cosmin M. Cotrut is Associate Professor at the University Politehnica of Bucharest, Romania and Invited Professor at the Tomsk Polytechnic University, Russia. His work is defined by research and development in the fields of surface engineering, corrosion science and biomaterials. Dr. Cotrut published over 50 papers in International Journals and presented over 90 papers at International Conferences. He is a member of Editorial Board of Heliyon Journal, Guest Editor for Frontiers in Materials Journal, reviewer for the following International Journals: Corrosion Science, Materials Chemistry and Physics, Materials Science and Engineering B and also editor or reviewer for international conferences proceedings. In the present he is Head of Electrochemistry and Surface Functionalization Laboratory and his work is focus on biofunctionalization techniques, deposition of calcium phosphates and biomaterials degradation.

Speech Title: Biomedical nanocomposites used for prosthetic restorations
Abstract: In clinical practice, numerous restorations are replaced after the ceramic fracture due to the poor bonding between the metallic alloys and the ceramic layer. For this reason, in the last years, many scientists tried to find a solution for improving the bond strength between metal and dental ceramics in prosthetic restorations. In the present paper, we proposed to add nanocomposite oxynitride coatings as interlayers between the metallic alloys and the ceramic layer. The nanocoatings were deposited on the most common dental alloys (NiCr and CoCr) using the cathodic arc technique. The elemental composition, crystalline structure, mechanical properties, surface roughness, contact angle and corrosion resistance of the coatings were investigated. The bond strength of the metal–nanocomposite-ceramic system, with and without interlayers, was evaluated by using a three-point bending test. The nanocomposite oxynitride coatings deposited on both alloy substrates demonstrated an improvement of bond strength in comparison with the uncoated substrates. All of the coatings had a superior corrosion resistance in artificial saliva (pH =5) than that both uncoated alloys.
The results demonstrate that the application of nanocomposite coatings as interlayer between the metallic and ceramic layer represents an effective alternative to increase the service life of prosthetic restorations.
Keywords: Oxynitride nanocomposites; Cathodic arc; Corrosion resistance; Prosthetic restorations