Radiography Safety

~ Exam ~

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This test has 20 questions.

All questions must be answered before the test can be graded.

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1. Digital imaging may offer reduced radiation exposure and the advantage of image analysis that may enhance sensitivity and reduce error introduced by subjective analysis.

  a. True

  b. False


2. Even though radiation exposure from dental radiographs is low, once a decision to obtain radiographs is made, it is the dentist's responsibility to follow the ALARA Principle (As Low as Reasonably Achievable) to minimize the patient's exposure.

  a. True

  b. False


3. Intraoral radiographs are less accurate than panoramic radiographs for the evaluation of dento-alveolar trauma, root shape, root resorption and pulp pathosis.

  a. True

  b. False


4. In pediatric patients, occlusal radiographs may be used separately or in combination with panoramic radiographs in the following situations:

  a. Unsatisfactory image in panoramic radiographs due to abnormal incisor relationship

  b. Localizations of tooth position

  c. When clinical grounds provide a reasonable expectation that pathosis exists.

  d. All of the above


5. Although bitewing radiographs can assist in detecting root surface caries in proximal areas, the usual method of detecting root surface caries is by clinical examination.

  a. True

  b. False


6. Studies have found that from 10 to 30 percent of edentulous patients exhibited abnormalities in panoramic radiographs.

  a. True

  b. False


7. The bitewing examination is the most efficient method for detecting proximal lesions.

  a. True

  b. False


8. In adolescents a radiographic examination consisting of posterior bitewings is recommended at intervals of 18 to 36 months.

  a. True

  b. False


9. Dental radiographs account for approximately 10 percent of the effective dose received from medical radiographs and fluoroscopies.

  a. True

  b. False


10. The ALARA Principle stands for “As Low as Reasonably Achievable”.

  a. True

  b. False


11. Digital imaging provides an opportunity to further reduce the radiation dose by 40 to 60 percent.

  a. True

  b. False


12. Collimation does not appear to limit the amount of radiation, both primary and scattered, to which the patient is exposed.

  a. True

  b. False


13. Use of long source-to-skin distances of 40 cm, rather than short distances of 20 cm, decreases exposure by 10 to 25 percent.

  a. True

  b. False


14. A setting above 90 kV(p) will increase the patient dose and should not be used.

  a. True

  b. False


15. The optimal operating potential of dental x-ray units is between 60 and 70 kVp.

  a. True

  b. False


16. The most vulnerable organ for patients in radiographic exposure is:

  a. parotid gland

  b. thyroid gland

  c. parathyroid gland

  d. submandibular gland


17. All protective shields should be evaluated for damage (e.g. tears, folds, and cracks) annually using visual and manual inspection.

  a. True

  b. False


18. Operator protection measures include:

  a. Education

  b. The implementation of a radiation protection program

  c. Occupational radiation exposure limits, recommendations for personal dosimeters and the use of barrier shielding

  d. All of the above


19. Dentists should develop and implement a radiation protection program in their offices.

  a. True

  b. False


20. Technique charts for intraoral and extra-oral radiography should list the type of exam, the patient size (small, medium, large) for adults and a pediatric setting.

  a. True

  b. False