Internal Dental Fistula Caused by Periapical Lesion in a Maxillary Fourth Premolar with a Supernumerary Root in a Dog

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  • 過剰根を伴う上顎第4前臼歯の根尖周囲病巣による内歯瘻の犬の1例
  • カジョウ コン オ トモナウ ジョウガク ダイ4 ゼン キュウシ ノ コン セン シュウイ ビョウソウ ニ ヨル ウチバロウ ノ イヌ ノ 1レイ

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Abstract

A border collie (male, nine years and five months old) presented with left infraorbital swelling and severe calculus deposition on the left maxillary fourth premolar. An oral examination revealed presence of gingival swelling around the left maxillary fourth premolar and drainage from the buccal gingiva located around the distal root apex. Radiography revealed bone resorption around the distal root of the third premolar and the medial and distal root apexes of the fourth premolar in the left maxilla, and a deformity of the distal root of the fourth premolar. Based on these findings, the dog was diagnosed as having internal dental fistula caused by periapical lesions and underwent extraction of the left maxillary third and fourth premolars. The fourth premolar had four roots, and there was a fissure in the crown. Histological examination showed inflammatory cell infiltration in the gingiva, pulp necrosis of the fourth premolar, and bacterial colonies around the lesions. The supernumerary root had fissures in the crown. These fissures may have served as the path for the infection in the root apexes. Abnormal morphological changes such as supernumerary roots and fissures in the crown may contribute to the onset of periapical lesions.

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