Influence of layer and stain firing on the fracture strength of heat-pressed ceramics
JOURNAL OF ORAL REHABILITATION, vol.23, no.3, pp.170-174, 1996 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 23 Issue: 3
- Publication Date: 1996
- Doi Number: 10.1111/j.1365-2842.1996.tb01229.x
- Journal Name: JOURNAL OF ORAL REHABILITATION
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.170-174
- Ankara University Affiliated: Yes
Abstract
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.