Photomicrographs of carious lesions, a. Photomicrograph of an unstained ground section of a tooth showing a carious lesion (CL) that has penetrated the entire thickness of the enamel (E) and spread laterally at the amelodentinal junction. D, dentin, b. The lesion here is more advanced. The enamel (E) has been undermined and weakened, causing fracture and a resulting cavity. At this point, bacteria can invade and penetrate down the exposed dental tubules, resulting in destructive liquefaction foci in the dentin (D) and, ultimately, exposure of the pulp. xl5. (From Eveson JW, Scully C. Color Atlas of Oral Pathology. London: Times Mirror International Publishers, 1995.)
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