Oligodontia: a study of its prevalence and variation in 4032 children.

The frequency of oligodontia in the study group was 4.34 percent; 79.82 percent of those with congenitally missing teeth lacked not more than two teeth. In terms of number of teeth missing, there was no significant difference between the maxilla and mandible. When considering the whole dentition, bilateral agenesis was more common than unilateral agenesis. The findings of this study largely confirm the results of previous studies of oligodontia.