7-Jolene
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 1. What type of screen emits blue light? | calcium tungstate phosphor
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| 2. What type of screen emits green light? | rare earth (usually samarium)
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| 3. When making extraoral radiographs, what is it that actually exposes the film? | light emitted from the intensifying screen when exposed to x-radiation
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| 4. How often should the screen be cleaned? | weekly
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| 5. What solution is recommended for cleaning the screen? | antistatic screen cleaner
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| 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
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| 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
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| 8. What should be the position of the Frankfort plane when exposing panoramic radiographs? | parallel to the floor
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| 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
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| 10. What is the term for the area of the panoramic machine that is in focus? | Image layer OR focal trough
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| 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)
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| 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)
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| 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
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| 14. True or false: The exposure time for panoramic machine is preset and cannot be changed. | true
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| 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
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| 16. What is the purpose of the Water's projection? | view the maxillary sinuses (also frontal)
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| 17. Which extraoral radiograph do orthodontists commonly prescribe for diagnosis and treatment planning? | cephalometric
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