Abstract
There are many case reports of supernumerary teeth, but rarely in the primary dentition. We found four cases which were considered to be supernumerary deciduous teeth.
The results were as follows.
1) They were discovered in Case 1 a 3y9m old boy, Case 2 a 6y4m old boy, Case 3a 4y3m old boy and Case 4 a 3y6m old girl.
2) In Case 1, there was a 6ylOm old brother whose right upper primary central incisor was a geminated tooth. In Case 3, there was a history of lip cleft.
3) They existed in the right upper primary incisor region in Cases 1,2 and 3, in the lower primary central incisor region in Case 4.
4) Their shapes were those of primary incisors, but some of them had anomalies in shape. They included development of the marginal ridge, dull angle of the distal line angle and long length of the crown compared with normal primary incisors.
5) We found that there existed permanent successional teeth germs for the supernumerary primary teeth in Cases 2,3 and 4, based on the examination of the X-ray.
6) In Case 1, we were not able to conclude which tooth was the supernumerary deciduous tooth. In Cases 2 and 3, we concluded that the deciduous teeth between the upper primary central and lateral incisors were supernumerary deciduous teeth from the shape of the tooth crown. In Case 4, we concluded the deciduous incisor in the mandibular median region was the supernumerary deciduous tooth from the position and size of permanent suceessional tooth germ.
