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SEM images (A–D) of surface roughness at baseline, 24 h, 96 h and 168 h in 4% acetic acid. (A): Baseline SEM photomicrograph of IPS e.max ceramic before immersion in 4% acetic acid (×5000). (B): SEM photomicrograph of IPS e.max ceramic after 24 h immersion in 4% acetic acid (×5000). (C): SEM photomicrograph of IPS e.max ceramic after 96 h immersion in 4% acetic acid (×5000). (D): SEM photomicrograph of IPS e.max ceramic after 168 h immersion in 4% acetic acid (×5000).
