Chapter 21 Flashcards
What is the purpose if occlusal radiographs?
to view large areas of the maxilla or the mandible.
Where is an occlusal film placed?
Between the teeth while pt. is occluded.
What are the two types of occlusal radiographs?
- Topographical Technique 2. Cross-sectional Technique
Topographical Technique
Produces a large PA radiograph. Topographical occlusals yield a greater amount of information of the alveolar crest and the apical areas than PA’s.
Topographical Radiograph
Cross-sectional Technique
yields more information about tori, impactions, and malpositioned teeth. It will also show calcifications in soft tissues, ie. Salivary gland stones or calcifying cysts.
Cross-Sectional Radiograph
Cross-Sectional Radiograph
What are Occlusal Radiographs used to locate?
- Supernumerary, impacted, unerupted teeth
- Retained roots or oddly located teeth
- Evaluate disease and lesions (cysts & tumors)
- Foreign bodies
- Salivary stones (sialoliths)
- Evaluate fractures of bone
- Evaluate size and shape of tori
- Can be used for patients with limited opening or for children
- Evaluation of sinus borders
- Evaluation of cleft palates
What are the 5 typical occlusal radiographs?
- Maxillary Topographical (anterior)
- Maxillary Topographical (posterior)
- Mandibular Topographical (anterior)
- Mandibular Topographical (posterior)
- Mandibular cross-sectional
When taking an Occlusal Radiograph, what do you need to make sure of?
Make sure the PID is pointed toward the white side of the film. Do not be afraid to have the patient lean their head back.
Have the film as far back as possible with the dot outside of the mouth.
Please note where the lead apron and not in the way.
What are the 3 methods of localization?
- Definitive Evaluation is based on shadow casting principles that is an object positioned farther away from the film will be magnified and less clearly imaged.
- Right –Angle Method—Take a cross-sectional occlusal radiograph
- Tube Shift Method (Buccal-Object Rule)
What is the Definitive Evaluation localization technique?
Based on shadow casting principles that is an object positioned farther away from the film will be magnified and less clearly imaged.
–So if the film packet is placed close to the lingual surface of the tooth, the lingual root is supposed to appear more clearly. The buccal root is farther from the film and is supposed to appear less clearly.
–The problem is this is not always true and so this is the least reliable of all the methods.
What is the Right-Angle Method localization technique?
Take a cross-sectional occlusal radiograph
–This is not an acceptable method in endodontic procedures. Really only effective if looking for a foreign body.
What is the Tube Shift Method (Buccal-Object Rule) localization technique?
- Most versatile and the one used most often.
- When 2 radiographs are taken from a slightly different angle (either horizontal or vertical), the structures shift slightly on the radiographs. If the structure moves in the same direction as the tubehead then the structure is on the lingual.
