Effects of Zirconia Addition on Fracture Toughness and Bending Strength of Dental Porcelains

Masayuki Kon, Kunio Ishikawa, Norihiko Kuwayama

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Zirconia dispersed composite porcelains with glass and aluminous porcelain as matrix were prepared as models of dental porcelains. The bending strength and fracture toughness of the composite porcelains were examined. The bending strength and fracture toughness of composite porcelains containing 50 wt% zirconia were 20 to 80 % greater than in glass alone. However, bending strength and fracture toughness decreased upon the addition of zirconia at more than 50 wt%. Moreover, in the case of aluminous porcelain as matrix, fracture toughness increased to a maximum value of 2.6 MPam1/2by addition of 23 wt% zirconia, twice the toughness of glass alone. On the other hand, no increase of bending strength was observed in this case. Deflection and bowing of cracks as well as microcracking effects were related to these increases of mechanical properties in zirconia dispersed composite porcelains.

Original languageEnglish
Pages (from-to)181-192230
Number of pages192050
Journaldental materials journal
Volume9
Issue number2
DOIs
Publication statusPublished - Jan 1 1990

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Dental Porcelain
Porcelain
Zirconia
Bending strength
Fracture toughness
Glass
Composite materials
Bending (forming)
Microcracking
zirconium oxide
Toughness
Cracks
Mechanical properties

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Dentistry(all)

Cite this

Effects of Zirconia Addition on Fracture Toughness and Bending Strength of Dental Porcelains. / Kon, Masayuki; Ishikawa, Kunio; Kuwayama, Norihiko.

In: dental materials journal, Vol. 9, No. 2, 01.01.1990, p. 181-192230.

Research output: Contribution to journalArticle

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