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Influence of layer and stain firing on the fracture strength of heat‐pressed ceramics
Author(s) -
ÜÇTAŞLI S.,
WILSON H. J.
Publication year - 1996
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1996.tb01229.x
Subject(s) - leucite , materials science , composite material , scanning electron microscope , core (optical fiber) , ceramic , fractography , fracture (geology) , fracture toughness
summary 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.