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TOday'S VeTerinary PracTice | September/October 2015 | tvpjournal.com PracTical denTiSTry Peer reviewed 60 For photostimulable phosphor (PSP) plates, or indirect digital radiography, the side with writing (Figure 4) is placed toward the back of the mouth, while the blank side faces toward the tube head. Place the sensor/plate as near as possible to (generally touching) the teeth and oral tissues in order to minimize distortion (Figure 5). if possible, position the sensor/plate within the mouth so that the entire tooth is covered; in general, the roots are twice as long as the crown. if coverage of the entire tooth is not possible with a size 2 sensor, which is commonly the case in large breed dogs: Figure 4. Size 4 PSP plate for indirect digital radiography; this side with writing is positioned away from the tube head. Figure 5. Digital sensor properly positioned for the mesial maxillary premolars on a clear model. The sensor should rest on the teeth/ oral soft tissues and be placed lingual/palatal enough to image the root apices. Figure 7. Bisecting angle technique: The angle between the tooth root (in this case the maxillary canine) ( red line) and the PSP plate is measured. This angle is then cut in half (bisected) ( blue line), and the PiD positioned perpendicular to this "imaginary" line. Figure 3. Size 2 digital sensor for direct digital radiography; this "back side" of the sensor should be positioned away from the tube head. Figure 6. Parallel technique for the mandibular premolars and molars in a feline skull model: The "patient" is in dorsal recumbency (although lateral would be acceptable) with the sensor parallel to the target teeth and the position indicating device (PiD) positioned perpendicular to both the teeth and sensor (a). The resulting image (B); note that the apex of the third premolar's mesial root is cut off. The bisecting angle technique ( f igure 13, page 65) is often necessary to image this root. A B