Chapter 15 Flashcards
What causes an unequal distribution of the arches in a radiograph?
Incorrect vertical angulation.
A quality bitewing radiograph should image an equal portion of the maxillary and mandibular teeth plus a portion of the supporting bone.
What results from incorrect centering of the x-ray beam?
Conecut error.
This occurs when the portion of the image receptor that was not in the path of the x-ray beam appears clear or blank on the resultant radiograph.
What causes overlap error in the distal or posterior region of the image?
The horizontal angulation was directed obliquely from the mesial.
What causes overlap error in the mesial or anterior region of the image?
The horizontal angulation was directed obliquely from the distal.
Are bitewing radiographs held in place by the patient occluding on the image receptor holder?
FALSE
Is the name ‘bitewing’ descriptive?
TRUE
Can proximal surface caries be identified using bitewing radiographs?
TRUE
Are bitewings limited in their ability to image the entire tooth?
TRUE
Can an undiagnostic image result from incorrect positioning of the image receptor holder?
TRUE
Is the image receptor for bitewing radiographs traditionally placed vertically in the posterior region?
FALSE
Should anterior bitewings be exposed using a vertical angulation of +20 degrees?
FALSE
Is it recommended to expose the molar bitewing first when taking four posterior bitewing radiographs?
FALSE
Is it sometimes necessary to expose more than four bitewing radiographs on an individual patient?
TRUE
Does conventional image receptor placement often result in overlapping of the contact area of molars?
FALSE
Are there four radiographs in a posterior bitewing survey?
TRUE
What is the term for the contact point between teeth in the same arch?
Proximal surface.
Does ‘overlap’ refer to an elongated or foreshortened image on a bitewing radiograph?
FALSE
Would a periodontally involved patient benefit more from vertical bitewing radiographs?
TRUE
Do periapical radiographs image the alveolar bone crest better than bitewing radiographs?
FALSE
If periapical radiographs are available, is there no need to expose additional bitewing radiographs?
FALSE
Should the smallest available image receptor be used for bitewings on a child patient?
FALSE
Does the size 3 image receptor have advantages over a size 2 image receptor for bitewing radiographs?
FALSE
In a Class II occlusal relationship, where should the anterior edge of the image receptor be positioned for a premolar bitewing?
FALSE
To avoid overlap error, how should the central ray of the x-ray beam be directed?
Perpendicular to the mean tangent.
Where should the anterior edge of the image receptor be placed for a premolar bitewing radiograph?
Align the anterior edge behind the distal half of the maxillary or mandibular canine.
What is the point of entry for all bitewing exposures?
On the level of the occlusal plane at a point opposite the center of the image receptor.
What type of error occurs when the image receptor is not centered within the x-ray beam?
Conecut error.
Which bitewing exposure should the radiographer start with first?
Expose the premolar bitewing on one side first.
What is the orientation of a traditionally placed bitewing radiograph in the posterior regions?
The longest dimension is placed horizontally.
For bitewing radiographs, which arch should be imaged more?
Both arches should be imaged equally.
What is the main purpose of the bitewing radiograph?
To detect caries on the proximal surfaces of adjacent teeth.
How should both arches be imaged?
Both arches should be imaged equally. Care should be taken to ensure that the image receptor is positioned in such a manner that it is evenly divided between the maxillary and mandibular teeth.
What is the main purpose of the bitewing radiograph?
To detect caries on the proximal surfaces of adjacent teeth. The ability to image incipient decay is particularly valuable in the molar region, where small carious lesions are often hidden because of the wide buccolingual dimensions of the teeth.
What size image receptor is used for bitewing radiographs on a child with primary teeth?
Size 0 or size 1. The preferred size for a mixed dentition is size 2. Tissue sensitivity or anatomical limitations must be taken into consideration when selecting image receptor size.
Which two angulations are critical to producing quality bitewing radiographs?
Horizontal and vertical angulations. Horizontal angulation is the positioning of the central ray in the horizontal (side-to-side) plane, while vertical angulation is the positioning of the central ray in the vertical (up-and-down) plane.
What is the name of the portion of the image receptor holder that helps the radiographer determine the point of entry?
External aiming device. Without an external aiming device, some operators find it difficult to determine the correct horizontal and vertical angulations and centering of the image receptor within the x-ray beam.
