<臨床>乳歯過剰歯の2例とその発症に関する考察

概要

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Supernumerary teeth are mostly seen in permanent and mixed dentition, which are originated from permanent teeth. But,supernumerary teeth in primary dentition are very rare. The authors discovered supernumerary tooth (duplicated canine) in the maxillary right primary dentition of 2 years 10 months male infant( Case 1) and supernumerary teeth in both sides between the lateral incisor and canine maxillary primary dentition of 2 years and 9 months male infant(Case 2). We investigated in detail locations of eruption, colors, form of tooth crown, grade of root formation or resorption, form of pulpchamber by X-ray and the age of patient etc. As a result, two cases were judged to the supernumerary teeth originated from primary dentition. We obtained the following result concerning the cause and the origin of the supernumerary primary teeth. 1. Cause of duplicated primary canine occurred to mediodens in maxillary and successive malformed lateral incisor. The supernumeray primary teeth in maxillary between incisor and canine originated from similar cause. 2. Duplicated or supernumeray tooth buds originated from that primary canine tooth buds were separated by some enviromental factor with phenocopy. 3. We have inferred that some enviromental factor in the early embryomental period that may caused these present cases.
北海道医療大学の論文
1992-12-31