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1. What type of screen emits blue light? calcium tungstate phosphor
2. What type of screen emits green light? rare earth (usually samarium)
3. When making extraoral radiographs, what is it that actually exposes the film? light emitted from the intensifying screen when exposed to x-radiation
4. How often should the screen be cleaned? weekly
5. What solution is recommended for cleaning the screen? antistatic screen cleaner
6. If a dark spot is evident on every panoramic film in the same spot each time, what should be suspected? light leak through the cassette
7. What will be the appearance on the panoramic radiograph if the patient's chin is tilted downward? exaggerated smile and blurred lower anterior teeth
8. What should be the position of the Frankfort plane when exposing panoramic radiographs? parallel to the floor
9. What should be the position of the anterior teeth when exposing panoramic radiographs? biting edge-to-edge on a bite piece (keeps some space between them); inside the focal trough
10. What is the term for the area of the panoramic machine that is in focus? Image layer OR focal trough
11. What is the most likely cause of the anterior teeth appearing large and out of focus on a panoramic radiograph? patient positioned too far back (too close to source of x-ray)
12. What is the most likely cause of images on the right side being larger that images on the left side of a panoramic radiograph? patient*s head is pivoted (turned) to the side (not centered)
13. What would be the appearance of the resultant image if a denture has been left in place during the panoramic exposure? denture teeth will show (look like floating crowns with no roots) as well as the metal pieces that retain the denture in the acrylic
14. True or false: The exposure time for panoramic machine is preset and cannot be changed. true
15. What should the patient be instructed to do with his or her tongue prior to the panoramic exposure? press it firmly into the roof of the mouth as during a swallow
16. What is the purpose of the Water's projection? view the maxillary sinuses (also frontal)
17. Which extraoral radiograph do orthodontists commonly prescribe for diagnosis and treatment planning? cephalometric
Created by: Sandys