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SEM and optical images of the occlusal surface view (left) and cross-sectional view (right) for (a) e-GZG and (b) monolithic Y-TZP after 1 x 106 cycles of sliding contact loading. (c) Porcelain-veneered Y-TZP following 105 cycles of sliding contact loading. A high-magnification image for the area marked by dashed box in (a), showing the structure of e-GZG consisting of external glass, graded glass-zirconia, and interior of Y-TZP.
