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Surface view of single-cycle sliding damage in (a) porcelain fused to zirconia at Pn = 120 N; (b) graded G/Z/G at Pn = 2000 N; (c,d) monolithic zirconia at Pn = 600 N and 1000 N, respectively. Note two faint incomplete ring cracks indicated by solid arrows in (c). Sliding direction from left to right of micrographs.
