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.
Animals ; Animals, Zoo ; Female ; Incisor/pathology/*surgery ; Malocclusion/pathology/surgery/*veterinary ; Rodentia/*surgery

PURPOSE: A corneal epithelial debridement using three different instruments was performed in rabbits, and the rates of corneal epithelium recovery were compared. Additionally, the extent of corneal damage as determined by the scanning electron microscopy was evaluated in each group. METHODS: Nineteen eyes of ten rabbits were classified into three groups according to the instruments used. The corneal epithelial debridement was performed using three different instruments: a Beaver blade (group A), a Bard-Parker blade No.15 (group B) and a dry cotton-tipped ap plicator (group C). After epithelial debridement, each cornea was observed every 24 hours for three days. After completion of the corneal recovery, each cornea was severed along the limbus and observed under the scanning electron microscope. RESULTS: The rate of corneal epithelial healing of the group C (dry cotton-tipped applicator) showed no statistical significance from those of the other groups. However, according to the corneal status observed under scanning electron microscope after debridement, cracks in the corneal surface in portions of group A and B were observed in contrast with no creaks in group C. CONCLUSIONS: Based on these results, corneal epithelial debridement using a cotton-tipped applicator is expected to reduce the occurrence of postoperative corneal complications. Use of a dry cotton-tipped applicator for corneal epithelial debridement in vitreoretinal surgery is suggested.
Cornea ; Debridement ; Electrons ; Epithelium, Corneal ; Eye ; Microscopy, Electron, Scanning ; Rabbits ; Rodentia ; Vitreoretinal Surgery