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Fatigue damage sustained in (a) porcelain fused to zirconia at 200 N 100,000 cycles; (b) graded G/Z/G at 200 N 1,000,000 cycles; and (c) monolithic zirconia at 200 N 1,000,000 cycles. Images are of both surface and sectional views. Note that, in (a), the partial cone crack (indicated by solid arrows in section view) has propagated to the veneer/core interface. Sliding direction from left to right of micrographs.
