Bitewing Radiography & Paralleling Periapical Radiography Flashcards
what are examples of intraoral radiographs?
bitewing radiographs
periapical radiographs
occlusal radiographs
what are advantages and disadvantages of intraoral radiographs?
adv
images have high detail/sharpness
fast exposure
low radiation does per image
dis adv
can be uncomfortable for the patient
difficult technique
what receptor size would you use for a bitewing radiograph & periapical posterior and anterior & occlusal ?
size 2 for bitewing & posterior periapical
size 0 for anterior periapicals
size 4 for occlusal
Perfect projection geometry should result in?
a fully accurate, undistorted image
of all of the components
involved in taking a radiograph
* X-ray beam
* Subject (e.g. tooth)
* Receptor
how would you Achieving best possible projection geometry?
keep patient still
Position receptor as close to tooth as reasonably possible
Ensure receptor is as stable as possible in the mouth
Focus-to-skin distance UK guidance recommends at least how long for intra-oral X-ray units from skin distance?
200mm
what do you see on a bitewing radiograph? and what do they detect?
pre molars and molars of the maxilla and mandible the crown and root of the tooth
caries and interdental caries
periodontal bone loss
overlapping teeth
assesing restorations
how many bitewings would you take on each side? where should the receptor be positioned?
1 on each side but 2 may be required due to over lapping teeth
Receptor should be as parallel to the dental arch as possible
what is the curve of spee?
Occlusal plane curves upwards and rises as you move distally
what do periapical radiographs show? what do we aim to see with a periapical radiograph? where is the receptor held?
the root and apex of the tooth
they show any lesions within the alveolar bone
endodontic treatment
caries
periodontal bone loss
apical inflammation
interrupted teeth
monitoring/planning of dental implants
assessment after dental trauma
The receptor is held parallel to the long axis of the tooth
what is the curve of Wilson?
when the teeth don’t sit on the jaws perfectly maxillary teeth sit bucal labial mandibular molars tilt lingually
What is the bisecting angle technique?
And when is it used ?
Tooth & receptor tilted at equal but opposite angles the 2 effects counteract one another and the image has accurate dimensions.
Used when unable to position receptor parallel to subject
What is the colour of the 3 radiograph receptors and what numbers are they
0 anterior periapical - yellow
2 periapical posterior & bite wing - green
4 occlusal blue
What would you take a vertical bitewing for ?
To show more of the root and the alveolar bone in more advanced perio disease
It captures less teeth on the image
What are the 2 different types of periapical?
Paralleling periapical & bisecting angle
When would you use the bisecting angle technique ?
Edentulous patients
Tender tooth preventing pt biting down
Younger child struggling to tolerate
What would you consider when justifying a radiograph ?
Age of patient
Findings on previous radiographs
Why this would benefit the patient diagnostically
Risks associated with the radiation
