After completion of the temperature recordings, the teeth were sectioned, and the remaining dentin thickness was determined. The lowest distance between the pulp chamber and prepared occlusal surface was measured to the nearest 0.01 mm by using an electric digital caliper (Orthopli Corp., Philadelphia, Pa) with the aid of a surgical operating microscope (Optilion PICO LED Microscope, Seliga Microscopes, Łodź, Poland).
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