下顎智歯部に発現した過剰歯の臨床統計的観察および文献的考察

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  • Clinico-statistical observation of supernumerary teeth appearing in the lower third molar region and a review of literature
  • カガク チシブ ニ ハツゲンシタ カジョウシ ノ リンショウ トウケイテキ カンサツ オヨビ ブンケンテキ コウサツ

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We conducted a clinico-statistical analysis of patients who had supernumerary teeth in the lower third molar region, and visited the Nagano Red Cross Hospital from October 1983 to September 2006. We compared our cases with other Japanese cases reported from 1982 to 2006. In our 15 cases, the male to female ratio was 1:1.5, and the most frequently associated generation was the 20's. The same results were obtained in other Japanese cases. One (6.7%) of our cases and 7 (26.9%) of other reported Japanese cases had more than three supernumerary teeth. The frequencies of impaction, normal appearance and fusion with adjacent third molar teeth in the teeth of ourcases were 100% (16/16), 62.5% (10/16) and 25.0% (4/16), respectively. Those of other Japanese cases were 93.1% (27/29), 80.0% (6/20), and 22.6% (7/31), respectively. We found that supernumerary teeth in the lower third molar region occurred in female more than males and typically showed impaction and a normal appearance. We also report a rare case of a 45-year-old female with dentigerous cyst arising from a supernumerary tooth in the left lower third molar region.

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