Fig. 1. Means and standard deviations of ΔE values for Co-Cr alloy substrate groups. Groups of zirconia in 1M1 shade (A), 1M2 shade (B), 2M1 shade (C), 2M2 shade (D), 2M3 shade (E) , 3M2 shade (F), 4M2 shade (G) and 5M2 shade (H).
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