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Michael Tholey

Influence on properties of the veneering porcelain

Lecture Description: 

Influence on properties of the veneering porcelain, such as shade, flexural strength, CTE etc., produced by firing in the dental porcelain furnace. The main focus will be on the shade. We have measured a ΔE up to 10 by a wrong firing schedule. Also a wrong firing is producing lots of thermal stresses within the porcelain layer leading to a higher risk of “chipping”.

About presenter: 

Michael J. Tholey is a team leader/ project manager research & development VITA Zahnfabrik responsible for veneering materials. He has Engineer Dental technology Diploma.
Publications:
1. “Influence of the bonder on the adhesion of porcelain to machined titanium as determined by the strain energy release rate” Dental Materials 23 (2007) 822–828 M.J. Tholey, J.N. Waddell, M.V. Swain
2. “Haftverbundmechanismen in dentalen Schichtsystemen“ Quintessenz Zahntech 2007;33(2): M J Tholey, M Stephan
3. „SEM observations of porcelain YTZP interface” Dental Materials, Volume 25, Issue 7, Pages 857-862 M.J. Tholey, M.V. Swain, N. Thiel
4. “Untersuchung des Einflusses verschiedener Keramikschleifersysteme auf Zirkoniumdioxid“.Quintessenz Zahntech 2008; 34 (4) A Coldea, M. Stephan, M.J. Tholey, N. Thiel
5. “Das Brennen von dentaler Verblendkeramik” Quintessenz Zahntech 2009; 35 (8) M.J. Tholey, N. Thiel
6. „XRD2 micro-diffraction analysis of the interface between Y-TZP and veneering porcelain: Role of application methods” Dental Materials 26 (2010) 545–552 M.J. Tholey, M.V. Swain, N. Thiel
7. “Thermal gradients and residual stresses in veneered Y-TZP frameworks” Dental Materials 27 (2011)1102-10. M.J. Tholey, M.V. Swain, Thiel N.
8. “Critical role of firing temperature on the physical properties of dental porcelains” Journal of European Ceramic Society , in press M.J. Tholey, M. Swain, N. Thiel
9. Keuper M, Berthold C, Tholey MJ, Nickel K. FIB derived cross sections in Y-TZP: induction of phase transformation? Poster at the Stockholm ECerS 2011
10. Benetti P, Tholey M, Thiel N, Kelly JR. Influence of cooling-rate on residual stresses