<unk>  (DD) is a rare genetic developmental disorder affecting<unk> e production of the teeth, commonly exhibiting an autosomal dominant inheritance that causes malformation of the root. It affects both primary and permanent<unk> ions in approximately 1 in every 100,000 patients. It is characterized by presence of normal enamel but atypical<unk>  with abnormal pulpal morphology. Witkop in 1972 classified DD into two types which are Type I (DD-1) is the radicular type, and type II (DD-2) is the coronal type. DD-1 has been further divided into 4 different subtypes (DD-1a,1b,1c,1d) based on the radiographic features.
Dentin dysplasia
Exostosis
Enostosis
Heterotopic ossification
Hypercementosis
Cemento-osseous dysplasia
Hyperostosis
Tooth ankylosis