Abstract
Ectodermal dysplasia may be characterized by complete abscence of teeth, abscence of sweat glands and sparseness of hair.
We experienced the case of Twins who visited the Pedodontic Clinic of Kobe Children's Hospital and were diagnosed as ectodermal dysplasia.
The dental findings were as follows:
1) The case of the elder brother was diagnosed as a hidrotic type and the case of the younger brother was considered as the same type.
2) The elder brother had at the time teeth EA|AE and l|l the permanent tooth buds. The younger brother had at the time teeth A|A and El|lE tooth buds.
3) The erupted teeth were entirely peg teeth.
4) The mandible basal bone was flat as in the aged.
5) Roentgeno-cephalometric analysis revealed the poor development of the maxilla.
