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20 Cards in this Set
- Front
- Back
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A panoramic radiograph is valuable when diagnosing each of the following EXCEPT one. Which one is the EXCEPTION?
a. A Cyst b. An impacted molar c. Recurrent caries d. A supernumerary tooth |
C. Recurrent Caries |
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Which of these is an advantage of a panoramic radiograph when compared to an intraoral radiograph.
a. A larger region is recorded b. the image is magnified c. Distortion is eliminated d. Definition is improved |
A. a larger region is recorded |
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Which of these is a limitation of a panoramic radiograph when compared to an intraoral radiograph.
a. Larger radiation dose to the patient b. Increased time required for exposure c. superimposition of structures may make interpretation difficult d. Requires an increase in patient instruction and cooperation with the procedure |
C. Superimposition of structure may make interpretation difficult |
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What is the term given to the technique where a slice of tissue is exposed distinctly, whereas structures outside the designated area are blurred out of the image.
a. Ghost Image b. Artifact c. Focal trough d. Tomography
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B. Artifact |
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All panoramic radiographs have 10 to 30 percent magnification
It is desirable to keep the magnification less in the anterior region and greater in the posterior region |
The first statement is true Second statement is false |
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The Panoramic PID is collimated to what shape?
a. Round b. rectangular c. Narrow Slit
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C. Narrow Slit |
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What term is given to the area where structures will be imaged with relative clarity, Whereas structures outside this area are blurred out of the image
a. Ghost image b. Artifact c. Focal trough d. Tomography |
C. Focal Trough |
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Each of the following is a component of the panoramic x-ray machine EXCEPT one. which one is the EXCEPTION
a. Rotational x-ray tube head b. Cassette holder or built in digital sensor c. Head positioner guides d. Variable exposure timer |
A. rotational x-ray tube head |
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Which dimension of the focal trough does the biteblock of the panoramic x-ray machine assist the operator with positioning?
a. anterior-posterior b. Lateral (left-right) c. Superior-Inferior |
A. Anterior- Posterior |
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Which of the following planes is used to position the patient correctly within the superior-inferior (up-down) dimension?
a. Ala-tragus line b. fankfort plane c. Midsaggital plane d. Both a and b |
Both (a) and (b) |
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Which of the following positioning errors results in anterior teeth that are blurry and narrowed in size?
a. Too far forward in the focal trough b. Too far backward in the focal trough c. Too far left in the focal trough d. Too far right in the focal trough |
A. Too far forward in the focal trough |
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When the dental arches are rotated to the left, the teeth on the right side will be positioned closer to the image receptor
The teeth closer to the image receptor will appear blurry and magnified |
D. Both statements are False |
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Which of the following positioning errors results in an exaggerated "smile" appearance of the arches?
a. Midsaggital plane tipped to the left b. midsaggital plane tipped to the right c. Chin tipped too far up d. Chin tipped too far down |
D. chin tipped too far down |
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The appearance of a large radiolucency that obscures the maxillary teeth apices result when?
a. the lips are not closed around the biteblock during exposure b. the tongue is not resting on the palate during exposure c.The lead thyroid collar gets in the way of the primary beam d. Facial jewelry is not removed prior to exposurer |
B. the tongue is not resting on the palate during exposure |
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Which of the following appears radiolucent on a panoramic radiograph?
a. Nasal cavity b. Nasal septum c. Nasal Spine d. Hard palate |
A. Nasal Cavity |
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Which of the following could be called a negative shadow?
a. Tongue b. Ghost image c. Glossopharygeal air space d. Biteblock |
C. Glossopharyngeal air space |
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Which of the following appears radiopaque on the panoramic radiograph?
a. External auditory meatus b. zygomatic Process of the maxilla c. Mental fossa d. Mandibular foramen |
B. Zygomatic Process of the Maxilla |
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List three air spaces that may be recorded on panoramic radiographs? |
Palatoglossal air space Nasopharyngeal air space Glossopharyngeal air space |
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List three machine parts that may be recorded on panoramic radiographs |
Chin Rest Side head positioner guides Biteblocks |
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What is the term given to a structure that is recorded a second time, with less sharpness, and on the opposite side?
a. Ghost image b. Focal trough c. Split image d. Tomograph |
A. Ghost Image |
