Two cases of dentin dysplasia type II are reported. These are very rare cases with a rate of incidence under 1/10000 or 1/100000.
The results of the clinical oral findings are as follows.
1) The patients were 10-year 6-month and 9-year 11-month old boys.
2) The general examination of Case I showed delayed growth for two years. Case 2 showed good general growth.
3) Roentgenographic examinations showed an unusual form of the pulp chamber in all of the teeth. In the external form of the pulp chamber, the stricture of the root canal at the cervical area, and a thistle tube-shaped pulp chamber were observed.
Radiopaque findings with many miliary round forms in the pulp chamber were found. The Coronal pulp chamber of the molar teeth was compressed in the vertical axis of the tooth with stricture of the root canal.
From the above findings, the two cases were diagnosed as dentine dysplasia type II using Shield's classification.