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Developmental Tooth Anomaly in a Cat

J VET DENT Vol. 29 No. 2 Summer 2012 A six-year-old male/castrated DSH cat presented to the Emergency Service at the Matthew J. Ryan Veterinary Hospital of the University of Pennsylvania for significant disease unrelated to the oral cavity. The cat was euthanized and a necropsy was performed. An incidental finding on necropsy was the presence of a double-crowned left maxillary third premolar tooth. Other oral examination findings included missing left maxillary second premolar and first molar teeth, and extrusion of both maxillary canine teeth. The cadaver specimen was examined, and a radiograph (lateral view because the cadaver head had been sectioned sagittally through the midline during the necropsy procedure) was obtained of the left maxilla (Fig. 1). The radiograph showed a double-crowned left maxillary third premolar tooth with three well-formed roots (Fig. 2). The root canals had an appropriate diameter for the cat’s age, and each canal was of similar width. The roots were of a similar size and had appropriate dimensions for a normal maxillary third premolar tooth. The periodontal ligament space surrounding the roots was within normal limits. The left maxillary second premolar tooth and first molar tooth were absent. The radiograph illustrates a developmental anomaly which was either the result of fusion or gemination and hypodontia (the absence of one or a few teeth).