後継歯を伴う下顎乳歯過剰歯の1例

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  • A Case Report of the Supernumerary Deciduous Tooth with the Permanent Successor

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There are many case reports of supernumerary teeth, but rarely in the primary dentition. We found a supernumerary tooth in the mandibular left deciduous incisal region and a geminated tooth in the mandibular right deciduous incisal region in a 3 year 7 month old girl.<BR>The findings were as follows. Oral condition<BR>1) Her dentition was that of Hellman's stage IIA. The number and the size of the deciduous teeth were normal except for the mandibular incisors.<BR>2) In the mandibular incisor region, five deciduous incisor were recognized. A supernumerary tooth was found in the region of the left deciduous central incisor. It was similar to the normal deciduous left incisor with resp ect to color, shape, and size.<BR>3) The mandibular right deciduous central incisor appeared as the geminated tooth and was larger in size. The fused line was recognized in its crown. X-ray findings<BR>1) The number and the development of the permanent teeth were normal except for the mandibular incisor region.<BR>2) The mandibular deciduous incisors including the supernumerary tooth and the geminated tooth showed normal root formation, and were associated with the permanent successor.3) The permanent incisors showed normal development except that the median one was displaced to the labial side. On the basis of these findings we arrived at the following conclusions.<BR>1) The deciduous incisor in the mandibular median region is the supernumerary tooth associated with the permanent successor.<BR>2) The mandibular right deciduous central incisor had joined with another supernumerary deciduous incisor to form a single large crown and then showed a fused line in it.

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