Internal Dental Fistula by Periapical Lesion in a California Sea Lion

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  • WATANABE Kazuhiro
    Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University
  • IMAI Ayako
    Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University
  • KANAYAMA Muneki
    Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University
  • MIYAWAKI Shingo
    Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University
  • SHIBATA Sanae
    Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University
  • TACHIKAWA Yoshiharu
    岐阜県世界淡水魚園水族館
  • TERASAWA Fumio
    新江ノ島水族館
  • YAMAZOE Kazuaki
    Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University

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Other Title
  • カリフォルニアアシカの根尖周囲病巣による内歯瘻の1例
  • 獣医公衆衛生・野生動物・環境保全関連部門 カリフォルニアアシカの根尖周囲病巣による内歯瘻の1例
  • ジュウイ コウシュウ エイセイ ・ ヤセイ ドウブツ ・ カンキョウ ホゼン カンレン ブモン カリフォルニアアシカ ノ コン セン シュウイ ビョウソウ ニ ヨル ウチバロウ ノ 1レイ

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Abstract

A 5-year, 9-month-old female California sea lion (Zalophus califomianus) began feeding poorly five months ago. It presented with swelling in front of the right orbit and drainage from the gingival mucosa in the right maxillary canine part. The swelling was improved by administration of an antibiotic and feeding also resumed. However, a relapse subsequently occurred. Because bone resorption was observed around the root apex of the maxillary right canine in a radiographic examination under husbandry training, an anesthetic chamber by isoflurane was introduced, and general anesthesia was maintained after intubation. Oral examination and treatment were then performed. Oral examination revealed pulp exposure from wear in many teeth. A fistula was recognized in the buccal gingival mucosa where the root apex of the maxillary right canine was located. When the maxillary right canine and all teeth with exposed, dental pulp was extracted and the sockets curetted, and the socket of the right maxillary canine and the fistula were penetrated. Therefore, this case was diagnosed as an internal dental fistula by periapical lesion of this tooth. Ten months after the operation the sea lion was in good condition. There are many pulp exposures by attrition in large exhibit animals. Improvement of the rearing environment, and diagnosis and treatment by routine oral and radiographic examination are therefore necessary.

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