Abstract
Statement of problem
Investigating the mechanical behavior of ceramics in a clinically simulated scenario
contributes to the development of new and tougher materials, improving the clinical
performance of restorations. The optimal in vitro environment for testing is unclear.
Purpose
The purpose of this in vitro study was to investigate the failure behavior of a leucite-reinforced
glass-ceramic under compression loading and fatigue in different simulated oral environment
conditions.
Material and methods
Fifty-three plate-shaped ceramic specimens were produced from computer-aided design
and computer-aided manufactured (CAD-CAM) blocks and adhesively cemented onto a dentin
analog substrate. For the monotonic test (n=23), a gradual compressive load (0.5 mm/min)
was applied to the center of the specimens, immersed in 37ºC water, using a universal
testing machine. The initial crack was detected with an acoustic system. The fatigue
test was performed in a mechanical cycling machine (37ºC water, 2 Hz) using the boundary
technique (n=30). Two lifetimes were evaluated (1×106 and 2×106 cycles). Failure analysis was performed using transillumination. Weibull distribution was used to evaluate compressive load data. A cumulative damage
model with an inverse power law (IPL) lifetime-stress relationship was used to fit
the fatigue data.
Results
A characteristic failure load of 1615 N and a Weibull modulus of 5 were obtained with
the monotonic test. The estimated probability of failure (Pf) for 1×106 cycles at 100 N was 31%, at 150 N it was 55%, and at 200 N it was 75%. For 2×106 cycles, the Pf increased approximately 20% in comparison with the values predicted for 1×106 cycles, which was not significant. The most frequent failure mode was a radial crack
from the intaglio surface. For fatigue, combined failure modes were also found (radial
crack combined with cone crack or chipping).
Conclusions
Fatigue affects the fracture load and failure mode of leucite-reinforced glass-ceramic.
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Article info
Publication history
Published online: September 16, 2017
Footnotes
Supported by the National Counsel of Technological and Scientific Development (CNPq) research grant 461178/2014-1.
Identification
Copyright
© 2017 by the Editorial Council for The Journal of Prosthetic Dentistry.
