chapter 42 multiple choice

a focal trough is _____.

an imaginary horseshoe-shaped area used for jaw placement.

what type of additional images are no longer necessary to supplement a panoramic radiograph when the new full-featured digital panoramic units are used?

bitewing.

what type of device is included on a panoramic unit?

cephalostat.

which of the following is (are) a component of a panoramic unit?

chin rest, notched bite-block, forehead rest.

what type of imaging is best for soft tissues of the temporomandibular joint?

computed tomographic scan.

what type of technology is used in panoramic units?

convenetional film-based technology and digital technology.

which of the following can cause "ghost images" on a panoramic image?

eyeglasses, earrings, necklaces.

on new full-featured digital panoramic units, which of the following can now be detected on a panoramic radiograph?

location of impacted teeth, lesions in the mandible, interproximal caries.

the purpose of a grid is to _____.

reduce the amount of scatter radiation.

which of the following is NOT an advantage of extraoral radiographs?

they show a close-up image of something.