Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: A case of maloccluded incisor teeth in a beaver: Castor canadensis | J. Vet. Sci. 2005 6 2 173-175 JOURNAL OF Case Report Veterinary Science A case of maloccluded incisor teeth in a beaver Castor canadensis Joong-hyun Kim Jae Yeong Lee1 Tae-Sung Han Kyu-bo Han Seong Soo Kang Chun Sik Bae Seok Hwa Choi College of Veterinary Medicine and Research Institute of Veterinary Medicine Chungbuk National University Cheongju 361-763 Korea 2College of Veterinary Medicine and Biotechnology Research Institute Chonnam National University Gwangju 500- 757 Korea A three-year-old female beaver Castor canadensis was referred to the Veterinary Teaching Hospital of Chungbuk National University. It had been raised in the Cheong-ju zoo and had a history of malocclusion caused by improper feeding. General anesthesia was induced and preoperative intraoral dental radiographs of the rostal maxillary and mandibular dentition were taken and lateral and ventrodorsal extraoral radiographs of the cheek teeth were also taken. The radiographs were negative for apical pathology and revealed a normal appearance of the cheek teeth. The lesion was likely to be related to the excessive length of the maxillary and mandibular incisors. Odontoplasty was performed to reduce overgrowth of the crowns of the incisors. Sequential transverse sections were removed until the crown was reduced by approximately its original length. The pulp chamber was not approached during the operation as confirmed by postoperative intraoral radiographic evaluation of the incisors. Recovery from anesthesia was uneventful and the beaver returned to normal masticatory activities immediately after the operation. Key words beaver incisor teeth malocclusion Beavers Castor canadensis are the second biggest species in the largest mammalian order Rodentia 2 . Characteristic of rodents are four prominent yellow or orange incisor teeth 2 4 . These teeth are necessary for the gnawing habits of these animals 2 . The dental formula for the beaVer is 2 X I 1 1 C 0 0 P 1 1 M 3 3 20. The incisor teeth continue to
