Techniques 1 Flashcards
name 3 types of intra-oral radiographs
peri-apical
bitewing
occlusal
what can u see in a peri-apical?
See from crown to root of teeth
what can u see in a horizontal bitewing?
from distal edge of 4 to mesial edge of 8, need to see the bone levels but not the whole root
what can u see in a vertical bitewing compared to horizontal?
more of the bone but still not the entire root
what can u see in a maxillary occlusal radiograph?
Anterior part of maxilla and anterior teeth
what can u see in a mandibular occlusal radiograph?
Tooth bearing portion of the mandible and the floor of the mouth
name this extra-oral radiograph
Lateral cephalogram
name this extra-oral radiograph
Postero-anterior mandible
name this extra-oral radiograph
Lateral oblique mandible
name this extra-oral radiograph
Occipito-mental views of facial bones
what happens to the detail of the image the closer the receptor is to the object?
better detail of image
radiographs are used to detect/asses
Apical infection/inflammation
Periodontal problems
Trauma - fractures to tooth or surrounding bone
Tooth morphology pre-extraction
Endodontics (RCT)
Evaluation of implants
tooth development
name 2 radiographic techniques
paralleling technique
bisected angle technique
name this intra- oral radiographic technique
paralleling technique
? technique
Uses ?
Receptor ? to tooth
X ray beam ? to tooth/receptor
Creates ? and ? image
paralleling
holder
parallel
perpendicular
accurate
reproducible
name intra-oral technique
bisected angle technique
is the bisected angle technique for intra-oral radiographs the standard technique? why?
no
Patient holds film so exposes fingers
when do u use the bisected angle technique for intra-oral radiographs?
when a patient cant tolerate a holder in their mouth
which teeth are blue holders used for?
anteriors
what teeth are yellow holders used for?
posteriors
what teeth are red holders used for?
bitewings
what teeth are green holders used for?
endodontic procedures
what are the 3 structural parts of a holder?
Bite block holds the receptor
Indicator arm/rod fits into the bite block
Aiming ring for alignment of the collimator with receptor
name two factors that affect image geometry
receptor tooth relationship
x-ray tube position
Vertical plane of the film parallel to?
long axis of the tooth
Horizontal plane of the film parallel to?
the dental arch
if the x-ray tube is angled up what happens to the teeth in the image?
elongates teeth
if the x-ray tube is anlged down what happens to the teeth?
shortens the teeth
explain the X-ray source to receptor distance
Want to be long so beam can diverge as cone shaped
explain the Object (tooth) to receptor distance
Want to be short
for anteriors the receptor orientation is horizontal or vertical?
vertical
for posteriors the receptor orientation is horizontal or vertical?
horizontal
what are some barriers to good positioning? 4
Mouth size
Gag reflex
Film size
Digital sensor shape and size
what film size do u use for adult anteriors?
0 or 1
what film size do u use for adult bisecting angles technique?
2
what film size do u use for adult posteriors?
2
what film size do u use for adult bitewings?
2
what film size do u use for child anteriors?
0
what film size do u use for child deciduous posteriors?
0
what film size do u use for child permanent posterior teeth?
2
what film size do u use for child bitewings >10yrs old?
2
what film size do u use for child bitewings <10yrs old?
0 or 1
what has caused this?
downwards vertical angulation
- shortened teeth
- separated cusps
what has caused this?
horizontal angulation has caused overlap of teeth
what has caused this?
upwards vertical angulation
- elongated teeth
- cone beam cutting has
