Journal of Nanomedicine & Nanotechnology

Nanostructured chemically bonded ceramics for dental and orthopedic use

19^th International Conference on Nanotechnology and Expo

November 13-14, 2017 | Atlanta, USA

Leif Hermansson

Applied Research Sweden AB, Sweden

Keynote: J Nanomed Nanotechnol

Abstract:

The chemically bonded bio ceramics (CBBC materials) comprise mainly phosphates, silicates and aluminates with calcium as the main cation. This presentation will give background aspects to the observed microstructures of the CBBCmaterials, which all seem to exhibit nanostructures, both nanocrystals and nano-porosity. Most examples will be related to the potentially mechanically strongest and most acid resistant of the CBBC-systems, namely the Ca-aluminate based bioceramics. Nanostructures including nanocrystals and nanoporosity are easily formed in the CBBC-systems due to a very low solubility product of the phases formed. The crystal size is <50 nm and the nano-channels surrounding all nanocrystals <3 nm in width. The nanostructure of the porosity opens for some specific applications related to dental applications, where antibacterial and bacteriostatic aspects are of importance. Another field where nanosize porosity is essential is within drug delivery systems for controlled release of medicaments. The surface and bulk composition was analysed using thin-film XRD and SEM with EDAX and the microstructure was studied with HRTEM with samples prepared using focused ion beam microscopy for high position site accuracy. Mechanical testing included flexural strength, compressive strength, Young´s modulus and fracture toughness. The nanostructures contribute to high mechanical strength and complete sealing of contact zones to surrounding materials. In summary; Biocompatibility including bioactivity, chemical and antibacterial aspects, bone void filling and sealing of contact zones to tissue, as well as controlled release of medicaments, will be treated in relation to the nanostructure of the chemically bonded bioceramics.

Biography :

Leif Hermansson has obtained his PhD in Inorganic Chemistry at Chalmers University of Technology, in 1977, received a grant as a Post-doc fellow at Pennsylvania State University, USA, 1977-78 and became Associated Professor in Ceramics at Chalmers University of Technology in 1983. He was the Research Director at ABB Cerama AB, 1984-1987. In 1987, he and his wife Irmeli founded Doxa AB. He was appointed Adjunct Professor in Materials Chemistry with special emphasis on Bioceramics at Stockholm University in 1993 and held a position as Adjunct Professor in Structural Ceramics at Materials Science Department at Uppsala University, Sweden 1999-2009.