PMID: 7988755Jul 1, 1993Paper

The strengthening mechanism of a magnesia core ceramic

Dental Materials : Official Publication of the Academy of Dental Materials
W J O'BrienT Y Tien

Abstract

A high-expansion core material containing magnesia and forsterite may be used to make all-ceramic dental crowns with porcelain-fused-to-metal body porcelains. The purpose of this study was to investigate the strengthening mechanism for the magnesia core material. Six batches of the magnesia core material were made by reacting magnesia with a silica glass with holding times ranging from 17 to 120 min. The flexural strength was measured using three-point loading according to the ISO specification for dental ceramics. The forsterite content was measured using quantitative x-ray diffraction. A statistically significant correlation was found between the forsterite content and flexural strength. The proposed mechanism for strengthening is the precipitation of fine forsterite crystals in the glass matrix surrounding unreacted magnesia. Longer reaction times produced more dissolution of magnesia and subsequent precipitation of forsterite. This method results in a new strengthening mechanism for dental ceramics which have previously relied on the incorporation of alumina, leucite or ceramic whiskers.

References

Jul 1, 1990·Dental Materials : Official Publication of the Academy of Dental Materials·R R SeghiA Caputo
Sep 1, 1967·The Journal of the American Dental Association·J W McLean
Oct 1, 1983·Journal of Dental Research·M R EdwardsG J Williams

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Citations

Apr 1, 1995·Journal of Dentistry·D BrownD C Watts
Jan 1, 1996·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·I L Deany

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