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Nd:YAG laser–irradiated lithium disilicate ceramic surfaces with varying time and power settings and constant frequency: (a) MSP 1 W, 10 Hz, 3 seconds; (b) MSP 2 W, 10 Hz, 3 seconds; (c) MSP 1.5 W, 10 Hz, 5 seconds; (d) MSP 2.25 W, 10 Hz, 5 seconds.
