Chapter 16 Flashcards
What describes the recommended point of entry of the central ray for maxillary posterior topographical occlusal radiographs?
Through a point on the ala-tragus line below the outer canthus of the eye toward the center of the image receptor.
Which occlusal radiograph yields more information about the location of tori and impacted teeth?
Mandibular cross-sectional occlusal radiograph.
What is the correct vertical angulation setting for a maxillary posterior topographical occlusal radiograph?
+45 degrees.
Does the cross-sectional technique produce an occlusal radiograph that resembles a large periapical radiograph?
FALSE
When imaging the mandibular arch, which side of the occlusal film packet faces the mandible?
The white, unprinted side.
When imaging the maxillary arch, which side of the occlusal film packet faces the maxilla?
TRUE
The white, unprinted side (front side) of the film packet is positioned against the arch of interest.
Should the identification dot on an occlusal film be placed toward the posterior of the oral cavity?
FALSE
Does the vertical angulation for topographical occlusal radiographs follow the rules of the bisecting technique?
TRUE
Can topographical occlusal radiographs of the mandible be taken with the head positioned the same as for maxillary topographical occlusal radiographs?
TRUE
Are specialized image receptor holders used for occlusal radiographs?
FALSE
What length PID should be used for the occlusal radiographic exam?
A shorter (8 inch [20.5 cm]) PID.
If the patient is seated correctly, what is the vertical angulation for a mandibular cross-sectional occlusal radiograph?
0 degrees.
Can the occlusal examination be made alone or to supplement periapical or bitewing radiographs?
TRUE
Will a cross-sectional occlusal radiograph significantly distort the image of the teeth?
TRUE
Are topographical radiographs of the mandible ideal for detecting salivary stones?
FALSE
Can occlusal radiographs be taken in five regions of the oral cavity?
FALSE
Must an occlusal radiograph be taken with the size 4 image receptor?
FALSE
What happens if the image receptor is not placed in the mouth with at least 0.25 inch protruding outside?
The result will be conecutting.
How is the horizontal angulation for topographical occlusal radiographs determined?
By directing the central rays at the image receptor perpendicularly through the teeth embrasures.
What is the recommended vertical angulation setting for a posterior mandibular topographical?
FALSE
The recommended vertical angulation setting is -45 degrees.
How are correct points of entry position determined?
By directing the central rays of the x-ray beam at the center of the image receptor.
Can predetermined vertical angulations and points of entry be used if the patient’s head is in the correct position?
TRUE
What assists in determining the vertical angulation for exposure of a cross-sectional occlusal radiograph?
Positioning the open end of the PID parallel to the plane of the image receptor.
What is the purpose of the occlusal radiographic exam?
To view large areas of the maxilla or mandible.
How is the image receptor positioned to expose an occlusal radiograph?
The white, unprinted side of the packet is placed against the arch of interest.
Where should the embossed identification dot be positioned when placing an occlusal film packet?
Away from the area of interest; toward the anterior.
What type of image receptor holder is used for occlusal radiography?
An image receptor holder is not used.
Do occlusal radiographs display dimensional distortion?
Yes.
Is a short or a long PID recommended for use in occlusal radiography?
A short (8 inch [20.5 cm]) PID is recommended.
List reasons for assessing a patient for occlusal radiographs.
To locate supernumerary, unerupted, or impacted teeth; to detect disease and lesions; to locate foreign bodies; to evaluate fractures; to examine cleft palate patients.
Can a thyroid collar be used during the occlusal radiographic exam?
Yes.
What are the recommended exposure settings for occlusal radiographs?
Similar to those used for periapical and bitewing radiographs.
Is it acceptable to recline the chair or tip the headrest back to facilitate obtaining an occlusal radiograph?
Yes.
