Topography landmarks of the infraorbital, mandibular and mentual foramens of Saimiri collinsi (Osgood, 1916) for anesthetic access and blocks.

Due to events related to the urbanization process, specimens of Saimiri collinsi are often referred to veterinarians specializing in the treatment of wild animals. With these professionals and the oral health of this species in mind, we evaluated the skull and the exact location of the infraorbital, mentual and mandibular foramens, with the aim of supporting the anesthetic block for dental procedures in Saimiri collinsi. The infraorbital foramen was located in the maxillary bone and was arranged with one on each side, except in one individual, with a pair in each antimer. The mentual foramen was located in the diastema between the canine tooth and the lateral incisor. The mandibular foramen was located medially on the ramus of the mandible, close to the mandibular incisure. The distances between the foramina and the main reference points, were greater in females than in males (p < 0.05). For access purposes, in the foramens investigated we suggest using a Gingival Needle 30G 21 mm Short, positioned externally at 15º to the maxillary bone to access the infraorbital foramen. Externally, perpendicular to the chin, in the diastema between the lower lateral incisor tooth and the canine tooth, to approach the mentual foramen, and ventral to the edge of the mandibular body, at a 90º angle, to access the mandibular foramen.