Chapter 2. High Expansion Feldspar Porcelain and Magnesia Core Materials

  1. William Smothers
  1. William J. O'Brien

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320259.ch2

Proceedings of Conference on Recent Developments in Dental Ceramics: Ceramic Engineering and Science Proceedings, Volume 6, Issue 1/2

Proceedings of Conference on Recent Developments in Dental Ceramics: Ceramic Engineering and Science Proceedings, Volume 6, Issue 1/2

How to Cite

O'Brien, W. J. (1985) High Expansion Feldspar Porcelain and Magnesia Core Materials, in Proceedings of Conference on Recent Developments in Dental Ceramics: Ceramic Engineering and Science Proceedings, Volume 6, Issue 1/2 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320259.ch2

Author Information

  1. School of Dentistry University of Michigan Ann Arbor, MI 48109

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1985

ISBN Information

Print ISBN: 9780470374245

Online ISBN: 9780470320259

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Keywords:

  • feldspar porcelain;
  • thermal expansion;
  • soda feldspar;
  • dental porcelains;
  • griffith crack theory

Summary

Feldspar porcelains have been used in dentistry for denture teeth since the early 1800s and more recently as veneering for crown and bridgework. Porcelains for veneering metal substructures have higher thermal expansion values due to an increase in leucite content. Recently high expansion magnesia ceramics have been developed which serve as an inner core reinforcement for the construction of all ceramic crowns. The construction of a feldspar crown is done by hand using finely ground factory-fritted porcelains and firing to produce vitreous sintering.