Progressive development of supernumerary teeth in cleidocranial dysplasia.

A 9-year-old boy suffering from cleidocranial dysplasia presented with multiple unerupted permanent teeth and five unerupted supernumerary teeth. During a 4-year observation and treatment period he developed nine more supernumerary teeth at a time when normally new teeth would no longer be forming. By the age of 13 years and 5 months a total of fourteen supernumerary teeth had been produced and it is possible that more teeth may develop in the future.