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Bar chart of mean and standard deviation values of fracture energy GC obtained from all tests performed. The unshaded and shaded bars represent the non-thermocycled/aged and thermocycled/aged specimens, respectively. The abbreviations are defined as follows: Z: zirconia, GZ: graded zirconia, P: feldspathic ceramic, SB: sandblasted, and E: chemically etched. Note that the data for zirconia are well below those for feldspathic ceramic or graded zirconia.
