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J Korean Acad Pediatr Dent. 2006;33(4): 722-727.
TRANSPOSITION OF THE IMPACTED PRIMARY SECOND MOLAR AND THE TOOTH GERM OF SECOND PREMOLAR
김송이, 최성철, 김광철, 이긍호, 최영철, 박재홍
경희대학교 치과대학 소아치과학교실
Corresponding Author: 박재홍 ,
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ABSTRACT
Most of impacted teeth reported are permanent teeth. Impaction of primary tooth caused by primary failure of eruption is rare and the most of impacted primary tooth are second primary molars. The etiology of a primary molar impaction would appear to be a physical barrier, early ankylosis of the tooth, abnormal development of the primary molar germ or malposition of the successor bud. Transposition has been described as an interchange in the position of two teeth within the same quadrant of the dental arch. It is most commonly seen with canine and lateral incisor teeth, but is rarely associated with the primary dentition. The two cases show the transposition of impacted primary molar and the tooth germ of second premolar in their clinical and radiographic examinations. In case 1, lower second primary molar was deeply impacted inferiorly to the tooth germ suspected to be a second premolar. In case 2, impacted all second primary molars were positioned inferiorly to the tooth germs suspected to be the successors. We extracted all second primary molars under general anesthesia and the extracted tooth germs appeared to be second premolars.
Keywords: Impaction | Primary second molar | Transposition | Second premolar
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