A defect in dentine development that is inherited as an autosomal dominant trait, affecting either the primary or the primary and permanent (secondary) dentitions. It is classified into two types. In type I the tooth crown has a normal appearance but there is no or rudimentary root development and incomplete or total obliteration of the pulp chamber; in type II the primary teeth have a brown or bluish discoloration with pulpal obliteration and the permanent teeth have normal sized roots with an enlarged, thistle-tube-shaped pulp chamber. Treatment involves the removal of pain, improvement of aesthetics, and protection of the posterior teeth from wear. See also dentinogenesis imperfecta.