We report a 26-year-old Japanese female with a supernumerary tooth in the right and left premolar regions of the mandible. In addition, we compared this case with cases reported by other researchers of the same supernumerary tooth. These bilateral teeth erupted lingually between the second premolar and first molar in the mandible. They were perfectly erupted. Their crown color resembled that of permanent teeth and their roots were fully formed. X-ray examination revealed clear pulp cavities. Morphologically, these supernumerary premolars resembled permanent premolars. These teeth were smaller than the patient's own premolar teeth. Although erupted supernumerary teeth can be found in any region of the mandible, the frequency of occurrence differs from region to region. However, this case, with bilaterally symmetrical supernumerary teeth in the lower premolar regions of an adult female, rarely occurs in permanent dentition.
下顎小臼歯部過剰歯と文献的検討
