<臨床>双生乳歯と癒合歯を伴う一例とその発生に関する考察

概要

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Primary teeth show less retrogression than permanent teeth. Therefore, the form and number of malformed teeth in primary dentition is less common than permanent dentition. The incidence of fused teeth in primary dentition is about 10 times that in permanent dentition. Most studies are on the relation of fused primary teeth to the succeeding permanent dentition or to maloccluion. However 3 sets of fused teeth in the primary dentition of infant is rare. The authors report a very rare case of upper geminated primary canine associated with 2 sets of fused CB|BC which appeared in a 3-year 4-month old girl. The following finding were obtained by macroscopic and radiographic examinations. 1. In the upper right primary canine, the mesio-distal diameter is much larger than normal primary canines and the X-ray picture shows a fused line in the middle of the crown. 2. Both CB| and |BC are completely fused together. 3. 2 sets of fused teeth are recognized in succeeding permanent dentition by X-ray picture. We cosider that the incident is due to enviromental factors influencing the infant over a long time.
北海道医療大学の論文
1987-12-30