Dentin dysplasia

Dentin dysplasia (DD) is a rare hereditary disorder affecting the development of dentin, the hard tissue that forms the bulk of teeth. It is classified into two main types: Dentin dysplasia type I (DD-I, also called radicular dentin dysplasia) and Dentin dysplasia type II (DD-II, also called coronal dentin dysplasia). Both types affect the primary (baby) and permanent teeth, though in different ways. In Dentin dysplasia type I, teeth typically appear normal in color and shape externally, but the roots are abnormally short or absent, and the pulp chambers (the inner space of the tooth containing nerves and blood vessels) are obliterated. This leads to extreme tooth mobility and premature tooth loss, often in childhood or early adulthood. Radiographically, teeth may show crescent-shaped or chevron-shaped pulp remnants. In Dentin dysplasia type II, the primary teeth have an amber or opalescent discoloration resembling dentinogenesis imperfecta, while the permanent teeth usually appear clinically normal. However, radiographs of permanent teeth reveal thistle-tube-shaped or flame-shaped pulp chambers with pulp stones. There is no cure for dentin dysplasia. Treatment is primarily supportive and dental-focused, including preventive dental care, restorative procedures such as crowns and bonding, endodontic treatment when feasible, and prosthetic rehabilitation including dentures or dental implants when teeth are lost prematurely. Early dental intervention and regular monitoring by a dentist experienced in hereditary dental conditions are essential to preserve dentition as long as possible. Genetic counseling is recommended for affected families. DD-II has been linked to mutations in the DSPP gene (dentin sialophosphoprotein), while the genetic basis of DD-I remains less clearly defined, though VPS4B gene mutations have been implicated in some cases.

Common questions about Dentin dysplasia