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Erosionlike denture markings possibly related to hyperactivity of oral soft tissues.

Five dentures with unique striations in the base, the teeth, or both were studied with the scanning electron microscope. Several case histories have been presented in which acrylic teeth, as well as acrylic and vulcanite denture bases, exhibit bizarre striations on surfaces in juxtaposition to the patients’ lips, cheeks, palate, and tongue. In view of the irregular pattern of the markings, the chemical inertness of plastic material, and the extremely fine substriations of the markings when these are examined under the scanning electron microscope, we suspect that hyperactivity of the adjacent oral soft tissue is a contributing cause of such markings. Possibly, they are also related to other erosionlike patterns on natural teeth.