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Cprespondence to Toshiomi Shirase,Department of Pediatric Dentistry, School of Dentistry at Tokyo The Nippon Dental University.E-mail : t-shirase@tokyo.ndu.ac.jp, TEL : 03-32615757, FAX : 03-5216-3720 Introduction In the clinical setting of pediatric dentistry, a trend of increasing number of children presenting with traumatic injury of the teeth is seen recently. Trauma to the permanent teeth occurs most commonly in the maxillary anterior teeth during the early half of the school ages, and the injured teeth are immature permanent teeth in the middle of eruption. During this period, if the tooth is avulsed due to trauma, replantation is attempted as far as possible. However, the periodontal membrane of the detached tooth is rarely well preserved, and the outcome is a high rate of bony ankylosis1). The occurrence of bony ankylosis during the developmental stage not only impairs normal eruption of the tooth2), but is also expected to have great impact on the dentition, occlusion and jaw development. For the purpose of elucidating the effect of bony ankylosis in immature permanent teeth on tooth eruption, we extracted the maxillary anterior teeth from young dogs, immersed them in fluoride and replanted the teeth to induce bony ankylosis, and examined the changes histopathologically.

Effect of Bony Ankylosis in Immature Permanent Teeth on Tooth Eruption