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27 Cards in this Set
- Front
- Back
What does panoramic mean |
wide view |
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What are the 4 things a panoramic is used for? |
Examining large areas of the face and jaws Locating impacted teeth or retained root tips Evaluating trauma,lesions, and diseases of the jaws Assessing growth and development |
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What else could panoramic radiographs help aid in the evaluation of? |
Large caries periodontal disease |
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It is important to note that research on the use of panoramic radiographs cautions against using panoramic images as a screening film for what? |
Occult diseases |
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Panoramic radiography is based on the principle of what? |
Tomography |
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Where is focal trough wider and narrower at? |
wider- Posterior Narrow- Anterior |
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All panoramic x-ray machines have four basic components what are they? |
Rotational x-ray tube head Cassette holder or digital image receptor Head positioner guides Exposure control panel
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To correctly align the dental arches within the other dimensions of the focal trough the radiographer must be able to determine the location of three facial landmarks what are they? |
Midsaggital plane Ala-tragus line Fankfort plane |
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The midsagittal plane must be positioned how for the correct lateral (left-right) position? |
Perpendicular to the floor |
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The ala tragus line must be positioned how? |
Approximately 5 degrees down toward the floor |
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when the ala tragus line is positioned correctly what else is in correct position |
Frankfort plane |
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Is a thyroid collar used for panoramic radiographs |
No must be removed just lead apron is used |
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The appearance of a reversed smile (frown) results when? |
Chin is raised to high |
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The palatoglossal air space appears as a radiolucency between the what? |
Palate and tongue |
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The nasopharyngeal air space appears as a radiolucency where? |
Posterior to the nasal cavity |
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The Glossopharyngeal air space appears as a radiolucency where? |
Portion of the pharynx located posterior to the tongue and oral cavity |
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The negative shadow the nasopharyngeal air space looks like? |
Radiolucent diagonal streak located superior to the radiopaque soft palate |
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When is the negative shadow of the nasopharyngeal air space emphasized |
chin is incorrectly tipped down |
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How does the glossopharyngeal air space negative shadow appear? |
Vertical radiolucent band superimposed over the ramus of the mandible |
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when is the palatoglossal air space appear more? |
If the tongue is not correctly positioned against the palate during exposure |
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Where does the radiolucency of the palatoglossal air space appear? |
Superimposed on or above the apices of the maxillary teeth |
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The focal trough is what? |
the area between the x-ray source and the image receptor where structures will be imaged clearly on the radiograph |
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Structures positioned outside of the focal trough will be? |
Blurred out of the image |
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The x-ray beam penetrates the patient from? |
the back of the head |
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Positioning the arches too far forward in the focal trough produces what? |
Blurred and narrow anterior teeth |
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Positioning the arches to far back in the focal trough produces what/ |
Blurred and widened anterior teeth |
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Positioning the arches to far to the lateral results in what? |
Narrowed teeth on the side closer to the image receptor and magnified teeth on the side closer to the x-ray tube head |