Two cases of supernumerary teeth found in the right and left premolar regions of the mandible.

Abstract

We observed two cases which had two and three supernumerary teeth in the right and left premolar regions of the mandible. In case 1, the teeth were on the mesio-lingual side of the mandibular first molar, on the mesial side of the mandibular first molar on the dental arch and in the mandible near the disto-lingual side of the left canine. In case 2, the supernumerary teeth were between the lingual side of both the first and second premolar.

These teeth were smaller than the average Japanese premolar. However, the other teeth were larger than the average Japanese tooth. Especially, the bucco-lingual diameter of the tooth was larger. In our observations of the tooth characteristics, the cingulum was greatly accentuated in case 1, but not in case 2, where the cingulum was no different from the average. On the contrary, the distance of the distal cusp of the mandibular molar was longer in case 2. Therefore, these teeth were more developed.

We could not conclude whether or not the supernumerary tooth appearance was related to the tooth size and/or other characteristics. However, it is important that much date of such cases be reported and studied.