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Quiz CH 42
| Term | Definition |
|---|---|
| The correct position of the Frankfort plane for a diagnostically correct panoramic image is | parallel to the floor. |
| A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient’s | lips were not closed on the bite-block during the exposure. |
| Advantages of panoramic imaging, when contrasted with intraoral imaging, include | less radiation exposure. |
| Which of the following is a device used to position the film and patient for an extraoral panoramic image? | Cephalostat |
| What new feature of the panoramic unit has allowed better resolution to show better details? | Digital technology |
| All of the following statements about panoramic imaging are true except | the digital panoramic unit uses film that has to be processed. |
| When a patient’s chin is positioned too low during the panoramic exposure | the mandibular incisors will appear blurred. the condyles will not be visible. |
| In panoramic imaging, _____ rotate(s) around the patient. | both the image receptor and the tubehead |
| When a patient’s teeth are not positioned in the groove of the bite-block and are too far forward, the teeth will appear | skinny. |
| To avoid a lead apron artifact on a panoramic radiograph | 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. |
| When the patient’s jaws are outside the focal trough, the resulting images are | blurred. |
| The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit, to accommodate patients of different sizes. | milliamperage and kilovoltage |
| The skull view that shows the frontal and ethmoid sinuses, the orbits, and the nasal cavities is the _____ projection. | posteroanterior |
| Computed tomography | is used in dentistry primarily for diagnosing lesions and planning implant cases. |
| Each panoramic unit has a(n) ______ that is used to align the patient’s teeth as accurately as possible. | head positioner |
| A panoramic image allows the dentist to do all of the following except | determine if a tooth is percussion sensitive. |
| When a patient’s chin is too high during the panoramic exposure | a “reverse smile line” will appear on the radiograph. |
| A grid | decreases the film fog, increasing the contrast of the image. |
| All of the following statements about the panoramic tubehead are true except the | tubehead rotates the film behind the patient’s head. |
| A ghost image will appear _____ than normal and on the _____ side of the image. | larger; opposite |
| All of the following statements about cone beam computed tomography (CBCT) are true except the | CBCT is a little difficult to learn to use and requires a lot of practice. |
| The focal trough is an imaginary three-dimensional curved area or space that bears the same shape as a | horseshoe. |
| Skull radiography is most often used in | oral surgery and orthodontics. |
| Advantages of panoramic imaging include which of the following? | 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. |
| A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise, a _____ will appear on the image. | ghost image |
| The CBCT is useful in helping the dentist | decide the correct placement of implants. with extractions of impacted teeth. determine the exact location of the mandibular nerve before surgery. |
| All of the following statements regarding magnetic resonance imaging (MRI) are true except the MRI | technique exposes the patient to a large amount of radiation and should only be used when no other source is available. |
| A radiopaque cone-shaped artifact on a panoramic image that interferes with the diagnostic information is caused by the | patient’s lead apron being incorrectly placed or a lead apron with a thyroid collar being used. |
| When a dark radiolucent shadow obscures the apices of the maxillary teeth, the | patient’s tongue was not in contact with the palate during the exposure. |
| The main components of the panoramic unit include the panoramic x-ray tubehead, the head positioner, and | exposure controls. |
| The purpose of the head positioner is to position the patient correctly in the | focal trough. |
| When a patient does not stand or sit with a straight spine | the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information. |
| The quality of the panoramic view depends on | how the patient’s jaw is positioned within the focal trough. the size of the patient’s jaw. how closely the patient’s jaw conforms to the focal trough. |
| The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit. | collimator |
| Which statement is true of a grid? | 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. |
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ARIGON5248