過剰歯の臨床的Ｘ線学的検討

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  • Clinical and radiological studies of supernumerary teeth.

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In the past, it was difficult to find out the supernumerary tooth of the latent state. But recently, Panoramic radiography has become so popular that we have a good opportunity to detect it. This case report is based on 6547 patients who have taken Panoramic radiography in Okayama University affiliated hospital of the Depertment of Oral Radiology from April 1982 to March 1985. In these cases, we have found 171 patients who have supernumerary teeth. Making a clinical and radiological examination, the following conclusions can be drawn from the study.<br>1) It was 171 (2.6%) patients who have supernumerary teeth, and 225 supernumerary teeth was detected in all 171 patients.<br>2) With respect to the age of the patients, most were under the age of 9. As to distinction between sexes, the ratio was 5 males: 2 females.<br>3) As for the common locations, the maxillary anterior region was most common, followed in turn by the maxillary molar region, the mandibular premolar region, and the maxillary premolar region.<br>4) Most of patients had one supernumerary teeth. Bilateral supernumerary teeth were found in 91.1per cent of those who had more than two.<br>5) The malformation was most frequently found in the anterior region and in the posterior region. In the premolar region, it was equal to normal formation.<br>6) Frequency of the embedded supernumerary teeth was 5.6 times that of erupting supernumerary teeth. Embedded supernumerary teeth were seen with horizontal or inverted dislocation or with cystic formation.<br>7) Malocclusion was most frequently seen in the anterior region as the sequelae of supernumerary teeth.

収録刊行物

  • 歯科放射線

    歯科放射線 27 (2), 161-166, 1987

    特定非営利活動法人 日本歯科放射線学会

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