Irregular dentin (lat. dentinum irregularis) is a radiological term for spiral ridges of dentin that differ from adjacent periodontal fibers. It got its name because of its outline, which really does not represent quite regular spirals.
Dentin is a material consisting of the main skeleton of hard tooth tissues, mainly keratin, covered with a thin layer of odontoblastic dentin. Located in the area of the crown of the tooth, it includes the dentin itself and the bundle of nerve fibers passing through it. In dentistry, the concept is often used as an X-ray image of dental tissue that is more convenient for familiarizing yourself with the structure of a tooth.