FREE AND STUDY GAMES ABOUT QUIZ CH 42 EXAM

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FREE AND STUDY GAMES ABOUT QUIZ CH 42 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -35 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: The purpose of the head positioner is to position the patient correctly in the

Answer:

focal trough.Question 2: The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.

Answer:

collimator Question 3: Which of the following is a device used to position the film and patient for an extraoral panoramic image?

Answer:

Cephalostat

Question 4: To avoid a lead apron artifact on a panoramic radiograph

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use a lead apron without a thyroid collar, and place the lead apron low around the neck of the patient so that it does not block the x-ray beam.

Question 5: A radiopaque cone-shaped artifact on a panoramic image that interferes with the diagnostic information is caused by the

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patient's lead apron being incorrectly placed or a lead apron with a thyroid collar being used.Question 6: All of the following statements about panoramic imaging are true except

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the digital panoramic unit uses film that has to be processed.

Question 7: The CBCT is useful in helping the dentist

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decide the correct placement of implants.with extractions of impacted teeth.determine the exact location of the mandibular nerve before surgery.Question 8: What new feature of the panoramic unit has allowed better resolution to show better details?

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Digital technology Question 9: When a dark radiolucent shadow obscures the apices of the maxillary teeth, the

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patient's tongue was not in contact with the palate during the exposure.Question 10: All of the following statements about cone beam computed tomography (CBCT) are true except the

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CBCT is a little difficult to learn to use and requires a lot of practice.

Question 11: Skull radiography is most often used in

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oral surgery and orthodontics.

Question 12: A panoramic image allows the dentist to do all of the following except

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determine if a tooth is percussion sensitive.

Question 13: When a patient's chin is too high during the panoramic exposure

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a "reverse smile line" will appear on the radiograph.

Question 14: Computed tomography

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is used in dentistry primarily for diagnosing lesions and planning implant cases.Question 15: The focal trough is an imaginary three-dimensional curved area or space that bears the same shape as a

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horseshoe.

Question 16: Which statement is true of a grid?

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The grid is placed between the patient's head and the film.A grid allows passage of the x-ray beam.Scatter radiation is absorbed by the lead strips on the grid, reducing film fog.Question 17: A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient's

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lips were not closed on the bite-block during the exposure.Question 18: The skull view that shows the frontal and ethmoid sinuses, the orbits, and the nasal cavities is the _____ projection.

Answer:

posteroanterior

Question 19: Each panoramic unit has a(n) ______ that is used to align the patient's teeth as accurately as possible.

Answer:

head positioner

Question 20: When a patient does not stand or sit with a straight spine

Answer:

the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information.

Question 21: In panoramic imaging, _____ rotate(s) around the patient.

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both the image receptor and the tubehead

Question 22: Advantages of panoramic imaging include which of the following?

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The entire maxilla and mandible are seen on one image.It is easy and quick to learn how to expose a panoramic image.Patients prefer panoramic images and are exposed to less radiation.Question 23: When the patient's jaws are outside the focal trough, the resulting images are

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blurred.Question 24: All of the following statements about the panoramic tubehead are true except the

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tubehead rotates the film behind the patient's head.Question 25: The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit, to accommodate patients of different sizes.

Answer:

milliamperage and kilovoltage