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17 Cards in this Set
- Front
- Back
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Intraoral radiography consists of
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methods of exposing dental x-ray film, phosphor plates, or digital sensors within the oral cavity.
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Producing diagnostic quality dental radiographs depends on knowledge of and attention to:
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Positioning the patient in the chair
Selecting a film, phosphor plate, or digital sensor of suitable size Determining how the image receptor is to be positioned and held in place Setting the radiation exposure variables Aiming the position indicating device (PID) |
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What are the Types of X-rays used for intraoral Examinations:
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Bitewing
Periapical Occlusal |
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The (2) techniques in
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Techniques
Bisecting Paralleling |
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Know the fundementals of shadow casting
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Use the smallest possible focal spot on the target (source of radiation).
The object (tooth) should be as far as practical from the target (source of radiation). The object (tooth) and the image receptor (film, phosphor plate, or digital sensor) should be as close to each other as possible The object (tooth) and the image receptor (film, phosphor plate, or digital sensor) should be parallel to each other. The radiation (central ray) must strike both the object (tooth) and the image receptor (film, phosphor plate, or digital sensor) at right angles (perpendicularly). |
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Bisecting technique — often not possible to position the image receptor parallel to the object, preventing the radiation from striking the object and the image receptor at right angles.
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Paralleling technique — the distance between the object and the image receptor is often greater than ideal in most regions of the oral cavity.
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The following use which size films:
Occlusal radiographs Horizontal bitewing Bitewing and periapical radiographs |
size #4
size #3 (#0, #1, #2) or any combination of these sizes (for adults, adolescents, and children) |
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The size of the image receptor selected for use depends on:
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age of the patient
size of the oral cavity shape of the dental arches presence/absence of unusual conditions or anatomical limitations |
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The size of the image receptor selected for use depends on:
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patient’s ability to tolerate placement of the image receptor
image receptor positioner or holder and technique used |
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When angulation of the PID is positioned toward the floor, is it a positive or negative angulation?
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Positive (plus)
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Angulations toward the ceiling are considered positive or negative?
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Negative (minus)
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To avoid cone cut errors where must the the image receptor be placed
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centered within the beam of radiation
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The point of entry for the central ray should be in the ___(blank)___ for the image receptor.
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middle
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What is a name for holders designed to position a phosphor plate or digital sensor
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Image receptor holders or positioners
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Patient positioning has the ___(blank)__ plane __(blank)__ to the floor and the __(blank)__ plane __(blank)__ to the floor
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Occlusal, parallel
Midsagittal, perpendicular |
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what is the suggested sequence of image receptor placements:
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Maxillary anterior periapicals
Mandibular anterior periapicals Maxillary posterior periapicals Mandibular posterior periapicals Anterior bitewings Posterior bitewings |
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Both the bisecting and the paralleling techniques are used to produce a __(blank)__ of the tooth on the radiograph.
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shadow image
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