RHS Purpose and Technique 90
Questions
A panoramic radiograph with a dark shadow over the apices of the
maxillary teeth may be caused by the patient
placing the tongue against the palate
not placing the tongue against the palate.
not appropriately positioned in the focal trough.
not biting on the bite block correctly. - ✔ ✔ not placing the tongue
against the palate
A radiograph will automatically be retaken when there is a
cone cut.
scratched plate.
bent plate.
double exposure. - ✔ ✔ double exposure.
An underexposed image will appear
grainy.
spotty.
light.
dark. - ✔ ✔ light.
Before exposing radiographs on a minor, the dental assistant should
,explain radiographs are mandatory for all patients.
obtain consent from parent or legal guardian.
explain radiographs are required by insurance.
obtain consent from the patient. - ✔ ✔ obtain consent from parent or
legal guardian
Blurred radiographic images are often caused by
failure to remove dental appliances.
overlapping bitewing.
improper positioning of the x-ray tube head.
patient movement during exposure. - ✔ ✔ patient movement during
exposure.
Compared to a dentulous patient, radiographic exposure time on an
edentulous adult patient should
remain unchanged
decrease
be doubled
increase - ✔ ✔ decrease
Compared to radiopaque structures, radiolucent structures
appear light on a radiograph
appear dark on an image
are dense
, absorb more radiation - ✔ ✔ appear dark on an image
Compared to the paralleling technique a disadvantage of the bisecting
angle technique is
image distortion.
the exposure time is longer.
the image receptor is more difficult to place.
increased radiation absorption. - ✔ ✔ image distortion
Cone beam computed tomography uses
two-dimensional technology.
three-dimensional technology.
panoramic cassettes.
customized image holders. - ✔ ✔ three-dimensional technology.
Dilaceration in a radiographic image indicates the
vertical angulation needs to be increased.
vertical angulation needs to be decreased.
image receptor was over-bent during placement.
root shape is abnormally bent or curved. - ✔ ✔ root shape is
abnormally bent or curved.
Foreshortening of the maxillary radiographic image results from
decreased vertical angulation.
increased vertical angulation.
Questions
A panoramic radiograph with a dark shadow over the apices of the
maxillary teeth may be caused by the patient
placing the tongue against the palate
not placing the tongue against the palate.
not appropriately positioned in the focal trough.
not biting on the bite block correctly. - ✔ ✔ not placing the tongue
against the palate
A radiograph will automatically be retaken when there is a
cone cut.
scratched plate.
bent plate.
double exposure. - ✔ ✔ double exposure.
An underexposed image will appear
grainy.
spotty.
light.
dark. - ✔ ✔ light.
Before exposing radiographs on a minor, the dental assistant should
,explain radiographs are mandatory for all patients.
obtain consent from parent or legal guardian.
explain radiographs are required by insurance.
obtain consent from the patient. - ✔ ✔ obtain consent from parent or
legal guardian
Blurred radiographic images are often caused by
failure to remove dental appliances.
overlapping bitewing.
improper positioning of the x-ray tube head.
patient movement during exposure. - ✔ ✔ patient movement during
exposure.
Compared to a dentulous patient, radiographic exposure time on an
edentulous adult patient should
remain unchanged
decrease
be doubled
increase - ✔ ✔ decrease
Compared to radiopaque structures, radiolucent structures
appear light on a radiograph
appear dark on an image
are dense
, absorb more radiation - ✔ ✔ appear dark on an image
Compared to the paralleling technique a disadvantage of the bisecting
angle technique is
image distortion.
the exposure time is longer.
the image receptor is more difficult to place.
increased radiation absorption. - ✔ ✔ image distortion
Cone beam computed tomography uses
two-dimensional technology.
three-dimensional technology.
panoramic cassettes.
customized image holders. - ✔ ✔ three-dimensional technology.
Dilaceration in a radiographic image indicates the
vertical angulation needs to be increased.
vertical angulation needs to be decreased.
image receptor was over-bent during placement.
root shape is abnormally bent or curved. - ✔ ✔ root shape is
abnormally bent or curved.
Foreshortening of the maxillary radiographic image results from
decreased vertical angulation.
increased vertical angulation.
