ABSTRACT
Pycnodysostosis is a rare genetic disorder and was first described in 1962 by Maroteaux
and Lamy. The incidence of this anomaly is estimated to be 1.7 per 1 million births.
The principal characteristics of this disorder are short stature, prominent eyes with
blue sclera, beaked nose, cranial dysplasia, exposed fontanelles and cranial sutures,
clavicular dysplasia, total/partial dysplasia of the terminal phalanges, obtused mandibular
gonial angle, and generally increased bone density. Some features of pycnodysostosis
are similar to osteopetrosis and cleidocranial dysostosis. Therefore, it must be distinguished
from osteopetrosis and cleidocranial dysostosis in order to diagnose it in individuals
of a younger age.
The aims of this case report were to show the clinical, radiographic, and diagnostic
features, as well as the cephalometric characteristics of pycnodysostosis in comparison
with Turkish cephalometric norms. (Eur J Dent 2012;6:454-456)
Key words
Cleidocranial dysostosis - diagnosis - osteopetrosis - pycnodysostosis