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A sound pre-molar tooth used in the study: (a) the microscopic section reveals a sound enamel and dentine on both the mesial and distal sides; (b) corresponding cropped image of CBCT examination that was interpreted by one observer as caries on both enamel and dentin on the mesial side. The second observer stated that there was only enamel demineralization but on both mesial and distal sides.
