W2: Rad- RBL Flashcards
Guide for limiting x-rays
Selection criteria for Dental Radiography
What STS is here?
arrows are the tongue
Magnification is like
like shadow
Near= smaller
Indications for periodontal conditions include…
calculus, fillings extended …
Influence of vertical angulation
What X-ray type is best for assessing bone loss?
AB height is 1-2 mm in B and in A it is lesser.
- either use parallel or BITEWINGS
A= Bissec B= parallel
How do you divide the tooth to track measurement of PD? What stage and percentage of bone loss is associated with each other?
divide teeth to coronal, mid, root 3rd,
- Minimal
- Top part of root
- Middle root
- End root
PD condition reccommendations for bw vs pa
If you can’t see bone level with BW, go take a PA to see bone level, huge mouth can do vertical BW
How do we assess PD (which bone structure do we look at)?
Image a: does this pt currently have periodontitis? Why or why not?
Image b: PD?
- look Acrest health + anatomy
image A: see cont of lamina dura (white line surr/RO surrounding PDL), cont with crest then goes other side. Pt had perio, they have recovered, healthy again but still hx of perio seen. under control.
image B/C: opacity of crest disappears. chronic inflammatory lesion in IP areas of periodontium. lots of vascularisation, granulation tissues. less bone, so soft tissue can fight infection.Acrest.
OPG classification of PD
- some localised increase/decrease.
- can break up description in sextants
What are the types of PD patterns?
- determine tx
e.g. furcation= diff tools
How is Horizontal BL classified in what divisions?
HBL= subdivide into extension into 3rds
A: white/RO crests
B: see calculus, no RO/white line, crest darker
What pattern and level of bone loss is indicated?
involve mid 3rd BL
mid/apical= need parallel PA sep for max/man
Vert BL extentions
beginning= 3 walls
2walls, adj tooth has prob
bad= 1 wall
(higher number wall= less severe.)
Higher number means walls visible on one tooth. As it extends to next tooth or is so wide it recedes gum there is only 1 wall that’s when it’s bad.
a: localised area of vertical bone loss bc angular to path of alveolar crest (horizontal is straight)
b: 2 wall pattern is like a dip/crater, huge overhange, plaque gets stuck
is the V or H bone loss?
Vertical
What is indicated here?
Not caries. Furcation involvement. Bone receeding.
furcation class
early vs severe
increase CEJ-crest distance H/V, 2mm or less radiolucency= early sign of furcation
anythin larger is severe
plaque
What type of bone loss pattern is occurring in arrowed area. Why?
overhang= VBL
What x-rays should you consider?
BW= mild V/H BL
Vertical BW: more severe
PA parallel
OPG= good but not reliable for PM region,
CT= really specific, just reserve for high complexity
Why might OPG not be ideal to assess BL?
good ball park, but req. BW
OPG= good but not reliable for PM region, anteriors
Conclusion reccomendation
avoid CBCT
- parallel when lesion
- start small then build up.
if PA says CEJ is less than 1, and you probe and sus measurements, then move to next option
Why may CBCT be useful?
see some bone loss, can remove overlaps and can determine how deep attachments are. but too much radiation. not indicated if you can use other x-rays
