Influence of layer and stain firing on the fracture strength of heat-pressed ceramics

Uctasli S., Wilson H.

JOURNAL OF ORAL REHABILITATION, cilt.23, sa.3, ss.170-174, 1996 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 3
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1111/j.1365-2842.1996.tb01229.x
  • Dergi Adı: JOURNAL OF ORAL REHABILITATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.170-174
  • Ankara Üniversitesi Adresli: Evet

Özet

Fracture strength (T=torque to initiate fracture; K-IC = fracture toughness) and the fractography of heat-pressed leucite reinforced ceramic (IPS Empress, Ivoclar AG-Schaan, Liechtenstein) were analysed by the notched disc test technique and scanning electron microscopy methodologies. To determine the effects of additional firing schedules on the heat-pressed core ceramic, three groups of specimens were prepared. These groups were heat-pressed core, heat-pressed core and simulated stain firing, and heat-pressed core and simulated layer firing. Statistical analysis of both T and K-IC values showed that there was no statistically significant difference between these three groups (P>0.05). Scanning electron microscopy analysis of the fractured surfaces revealed that crack propagation occurred around some of the leucite particles and also partly and directly through other leucite particles.