| Question |
Answer |
| 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 |
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