Intraoral techniques Flashcards
What should be seen on a periapical?
The entire length of the crown and root
2mm of bone beyond apex
Full extent of lesion and surrounding normal bone
What are the 5 indications for periapicals?
- Restorations
- Caries
- RCT or perio treament
- Swelling/fistula
- Pulpitis or pulp necrosis
What should be seen on a bite wing?
Entire crown and 1/3 of the root of upper and lower posteriors, surrounding crestal bone, inter proximal contacts
What are the indications for a bite wing?
- Clinical suspicion of inter proximal area
- Smooth surface caries
- See how close caries are to pulp
- Visualize restorations, overhang, etc.
In the paralleling technique the image receptor is _____ to the ________ of the tooth?
Parallel to the long axis
What is typically increased in the paralleling technique?
The object to film distance
How do we compensate for the increased object to film distance in the paralleling technique?
Maximize the source to object distance
What are the advantages to the paralleling technique?
Teeth are dimensionally accurate and non-diagnostic radiation is reduced
What are the disadvantages to the paralleling technique?
Large object to film distance may raise magnification and lower sharpness
Difficult placement in small mouths and around tori
What are the advantages to the bisecting angle technique?
Ease of placement in smaller mouths and easier positioning of the tube head due to a shorter cone
What are the disadvantages of the bisecting angle technique?
Difficult to visualize the receptor for correct angulation
Image receptor may slip or bend
Hard to get dimensionally accurate images
What is seen in the maxillary central view?
The centrals and portions of the laterals
What are the requirements for the maxillary central view?
Edges of the teeth parallel to image edge and clear contacts
In the maxillary canine-lateral view what is centered on the image?
The contact of the lateral and canine, it is seen clearly without overlap
What teeth are visible on the maxillary premolar view?
The distal half of the canine to the 2nd molar
On the maxillary premolar view which contacts must not overlap?
Canine to 1st molar contacts
The maxillary molar view shows what teeth?
The distal half of the 2nd premolar, the 3 molars, and the tuberosity
What teeth are included in the mandibular central view?
All 4 incisors, mesial of canines
In the mandibular canine lateral view what is centered on the image?
The canine lateral contact, it is shown clearly without overlap just like the maxillary
Are the mandibular premolar views and molar views any different than maxillary?
No, show the same things
What is seen on a premolar bite wing?
Crowns and crestal bone from distal of canine to 1st molar
Clear contacts, occlusal plane is parallel to image receptor edge
What is seen on a molar bite wing?
The distal of the 2nd premolar to the distal of the last molar
Why would you use a vertical bite wing?
The patient has a history or or evidence of periodontal bone loss
What brand of positioning instrument is used at the school and what does it stand for?
Rinn XCP, extended cone paralleling
What colors indicate what kind of radiograph?
Blue= anterior PA Red= bite wing Yellow= posterior PA
What should be inserted in the mouth opposite the bite block?
A cotton roll in the buccal vestibule
Which quadrants are taken one after the other?
1 and 3 then 2 and 4
On the maxilla, why is the film often far from the tooth?
Hard palate gets in the way
On the mandible, is the film closer or further from the tooth?
Close, resulting in shorter object film distance
As a result of the shorter object film distance on the mandible we can?
Use a shorter collimator, less magnification and blurriness
What are indications for an occlusal view?
Trauma, patient unable to fully open, large lesions, localized lesions, impacted teeth
A maxillary occlusal view is useful for?
alveolar fractures, periapical lucencies, and midline abnormalities
What is a mandibular topographical occlusal view for?
Sympheasal fractures and midline anomalies
The mandibular topographical occlusal view is useful for?
Those who have limited ability to open their mouths
The mandibular cross sectional occlusal view is useful for?
Expansile lesions and seeing stones in the submandibular duct
