Subcritical Crack Growth Velocities (v-K Curves) of Dental Bioceramics

Humberto Naoyuki Yoshimura; Carla Cristina Gonzaga; Paulo Francisco Cesar; Walter Gomes Miranda

doi:10.4028/www.scientific.net/MSF.727-728.1211

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Subcritical Crack Growth Velocities (v-K Curves) of Dental Bioceramics

Abstract:

In this study the subcritical crack growth (SCG) behaviors of five dental bioceramics were evaluated in order to plot the crack growth velocity versus stress intensity factor (v-K) curves. Disc-shaped samples of two sintered porcelains, two glass-ceramics, and a glass-infiltrated ceramic composite were prepared and tested in artificial saliva using a biaxial flexure jig. The SCG parameters were evaluated by the dynamic fatigue test using five constant stress-rates and in an inert condition. Among the tested materials, the lithium disilicate glass-ceramic showed the highest susceptibility to strength degradation by SCG, whereas the glass infiltrated alumina composite showed the lowest susceptibility. The v-K curves showed that the SCG susceptibility significantly affects the crack growth velocity of the different bioceramics.

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Materials Science Forum (Volumes 727-728)

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1211-1216

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.727-728.1211

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Online since:

August 2012

Authors:

Humberto Naoyuki Yoshimura, Carla Cristina Gonzaga, Paulo Francisco Cesar, Walter Gomes Miranda

Keywords:

Bioceramic, Crack Growth Velocity, Dental Ceramic, Lifetime, Subcritical Crack Growth

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