Essential Tips for Dental Radiographers

~ Exam ~

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1. Misangulation of the ________ causes overlap, obscuring incipient caries.

  a. teeth

  b. patient's head

  c. x-ray beam

  d. none of the above


2. The three elements to keep in optimum alignment in order to achieve a good diagnostic x-ray:

  a. Floor of the Mouth, Sensor, Teeth.

  b. Palate, Teeth, X-ray Beam.

  c. Source, Teeth, Sensor


3. The principle behind “bisecting the angle” is to:

  a. Split the difference between the angle of the tooth and the angle of the sensor lining up the beam at that imaginary point

  b. Line up x-ray beam at imaginary point between floor of mouth and teeth.

  c. Achieve a diagnostic x-ray as film and teeth are unable to be parallel to one another for whatever reason.

  d. a. and c.


4. What are some concerns of implementing digital x-rays?

  a. Initial cost is significant.

  b. Patients are exposed to more radiation.

  c. Concerns with fraud and manipulation of image.

  d. All of the above.

  e. a. and c.


5. The following statements are true regarding patient’s consent and x-rays:

  a. The patient should give documented informed consent as well as be given a full explanation of benefits and risks of radiation exposure

  b. A written, signed, consent form is the easiest way to document the patient's approval

  c. A signed refusal demonstrates to the patient that he is aware and responsible for limitations created by not getting x-ray

  d. All of the above


6. The following are FALSE regarding digital radiography:

  a. Even in pregnant patients and children, thyroid collars are no longer recommended per The National Council on Radiation Protection & Measurements (NCRP)

  b. Digital sensors are more rigid but less sharp on the edges vs film

  c. There is LESS radiation exposure using digital sensor vs film

  d. Blue-tooth capabilities are now being used in digital radiography


7. The CDC recommends disinfecting digital sensors with an EPA-registered disinfectant after removing the disposable barrier.

  a. True

  b. False


8. Exceptional diagnostic x-rays have the following qualities:

  a. the occlusal plane should be as vertical as possible in the x-rays.

  b. the interproximal contacts should not overlap.

  c. at least 3-4 mm of alveolar bone should be visible beyond the apex.

  d. a and c

  e. b and c


9. A general rule of thumb, when taking x-rays, is:

  a. place the film parallel to the teeth, and the cone perpendicular to the film.

  b. place the film perpendicular to the teeth, and the cone parallel to the film.

  c. place the film parallel to the teeth, and the cone parallel to the film.


10. Gagging is best controlled by:

  a. persuading the patient to breath through the nose.

  b. being firm with the patient.

  c. having the patient pant through the mouth.

  d. Telling patient problem is all in their head and force x-rays quickly!