Today's Veterinary Practice

SEP-OCT 2015

Today's Veterinary Practice provides comprehensive information to keep every small animal practitioner up to date on companion animal medicine and surgery as well as practice building and management.

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tvpjournal.com | September/October 2015 | TOday'S VeTerinary PracTice PracTical denTiSTry Peer reviewed 63 To initiate a radiograph with this technique: • Mandibular premolars/molars: Place the sensor/plate in the mouth and set the P id perpendicular to the sensor/plate. • Maxillary premolars/molars: rotate the beam laterally to a 45-degree angle. • canines/incisors: rotate the beam rostrally 20 degrees. Exceptions There are only 4 conditions in which these techniques may not produce a diagnostic image: 1. Maxillary canines: Because the maxillary canine roots lie directly dorsal to the maxillary frst and second premolars in dogs and the second and, occasionally, third premolars in cats, a maxillary occlusal image produces overlap with these structures (Figure 12 a, page 64). Therefore, in addition to the 20-degree rotation rostrally, rotate the Pid 20 degrees laterally to image the root over the nasal cavity and avoid this superimposition (Figures 12b and 12c, page 64). 2,12,13 2. Rostral mandibular premolars (frst and second in dogs; third in cats): The apices of these teeth are often "cut off " on images exposed with the parallel technique due to the symphysis interfering with placement of the sensor/plate suffciently ventral to capture the apices, therefore, Figure 11. Proper imaging of the incisors and mandibular canines: Due to the caudal curve of these teeth, the bisecting angle for the roots—70 degrees to the sensor—is very different than the angle for the crown. Demonstrated are the proper positioning (a) and resulting image (B) for mandibular incisors and canines in a cat, and the proper positioning (c) and resulting image (d) for maxillary incisors in a dog. Note that figure 11c demonstrates lateral recumbency, which is this author's recommended technique, although sternal recumbency is also acceptable. C D A B

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