Extraoral And Digital Radiographic Procedure Flashcards
Extraoral
Outside the mouth
Panoramic radiographs
Image that helps to visualize the entire dentition in both arches, along with maxillary sinuses and the nasal cavity.
Focal trough
An imaginary horse shoe shaped three dimensional area.
Compartments of the panoramic unit
Panoramic x-ray tube head
Head positioner
Exposure controls
Head positioned
used to align the patients teeth as accurately as possible
Ghost image
Caused by the failure to remove earrings, dentures, and other radio dense objects. Looks like a real object, except that it appears on the opposite side of the film.
Lead apron artifact
If placed too high, or if a lead apron with a thyroid collar is used, a cone shaped radiopaque results. To avoid this area, placed a lead apron lower around the patient’s neck.
Improper tongue placement
If the tongue is not placed on the roof of the mouth, a radiolucent shadow will be superimposed over the apices of the maxillary teeth
Chin too high
It’s a Chinese tipped upward, the radiograph will exhibit a reverse smile line and detail will be lost.
Chin too low
When the chin is tipped downward, the radiograph exhibits an exaggerated smile line, and the condyles are not visible.
Lateral cephalometric projection
This radiograph is used to evaluate bones of the face in school, including trauma, disease, or facial abnormal tees. It is used primarily for orthodontic purposes.
Posteroanterior projection
This radiograph is used to evaluate facial growth and trauma, disease, and facial development.
Submentovertex projection
This projection, which is not commonly used in dental offices, evaluates the position of the condyles, base of the skull, and fractures of the zygomatic arch
Reverse towns projection
This projection, which is not commonly used in a dental office, evaluate fractures of the condylar neck and ramus.
Waters projection
This projection is used for evaluating factors of the face, sinuses, the maxilla common zygomatic arch is, the orbit of the eyes, and the coronoid process.
Cephalostat
The cephalostat includes a film holder and head positioned that allow the operator to easily position the patient.
Grid
A device used to decrease film fog and increase the contrast of the radiographic image. It does this by reducing the amount of scatter radiation that reaches the extraoral film exposure
Scatter radiation
X-rays at bounce off bones and teeth. Scatter radiation causes film contrast.
Lateral jaw projection
Used to view the posterior region of the mandible. This type of projection is very useful for patients with limited y’all opening or cannot tolerate intraoral film placement
Body of mandible projection
These techniques are designed to evaluate the posterior region of the mandible, including impacted teeth, factors, and lesions, the cassette his place directly on the patients cheek. One disadvantage is that the patient must hold the cassette.
Ramus of mandible projection
This film is used to evaluate impacted third molars, large lesions, and fractures that extends into the Ramus of the mandible. The Ramus from the angle of the mandible to the condyles is visible in this projection
Digital radiography
The film less digital radiographic system
Digital radiography equipment
Dental x-ray unit
Intraoral sensor
Computer
Types of digital imaging
Direct
Indirect
Storage phosphor
