Development of SiO2 – Li2O – P2O5 – ZrO2 dental glass-ceramic systems with extended lifetimes: crystallization mechanisms and resistance to subcritical crack growth (Li-Silicates)

Third Party Funds Group - Sub project


Acronym: Li-Silicates

Start date : 01.10.2021

Overall project details

Overall project

Dentale Glaskeramiken im System SiO2 - Li2O - ZrO2

Project details

Scientific Abstract

Classes of materials that resemble natural teeth, such as polycrystalline ceramics, glass-ceramics and ceramic-methacrylate composites, have been preferred for tooth replacement for some time.

The first commercial product was based on a non-stoichiometric multi-component SiO2-Li2O-Al2O3-K2O-P2O5-ZrO2-ZnO system that was pre-crystallised, then melted and injected into a mould made of refractory material. The resulting glass-ceramics reached a degree of crystallisation of ~70 vol% with elongated Li2Si2O5 crystallites exhibiting very good mechanical properties.

The research approach makes it possible to determine relationships between the mechanical properties, composition and microstructure, either in the glass-ceramic or in the residual glass.

For this purpose, the influence of the SiO2/Li2O molar ratio on the crystallisation behaviour of Li2SiO3 and Li2Si2O5 phases is analysed and the effect of ZrO2 addition at constant SiO2/Li2O ratio on crystallisation kinetics and network structure of the residual glass is investigated.

Involved:

Friedlinde Götz-Neunhoeffer Project Leader Dominique de Ligny Project Leader Ulrich Lohbauer Project Leader Katrin Hurle Project Member Renan Belli Project Member

Contributing FAU Organisations:

Lehrstuhl für Mineralogie Naturwissenschaftliche Fakultät Medizinische Fakultät Geozentrum Nordbayern Professur für Werkstoffwissenschaften (Glas und Keramik) Department of Operative Dentistry and Periodontology Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde

Funding Source

Deutsche Forschungsgemeinschaft (DFG)