W2: Rad- Teeth + Supporting Structures Flashcards
Radio opaque vs Radiolucent
appear white bc absorbs
bone/enamel= white
RL= pulp= dark
Layers of tooth
bone/enamel= white
cementum= no density bc very similar to dentine, so you cant see it on root, so similar to bone sometimes
Types of Dentine can affect what
size of pulp reduces as person grows older, can see in x-ray
What can DEJ be mistaken for
caries by mistake. bc of match band effect. (MBE)
e.g. in Q pic you see false greys… can happen in x-rays, sometimes amalgams have RL lines making MBE
In young pt what can you see? vs older
root forming, RL area in root, progress in development… reduction in pulp bc dentine (secondary grows)
After eruption how does it take for tooth root to form?
2-3 years after eruption, apex closes
After eruption how does it take for tooth root to form?
2-3 years after eruption, apex closes
age
10?
No 2nd molar: under 11
Tooth is in alveolar bone, there is a dark area on gingival margin on xray, why so?
btw CEJ and crest of alveolar bone- not covered by bone or enamel but by gingiva.
neck of tooth is less dense compare to top/bottom. as xrays pass through, photos that cross neck they carry higher energy bc dense tissues abs photons so less photons reach film… can be mistaken for caries.
if less dense= more photons reach=white
How to tell if it is cervical caries vs burnout?
root caries NEED BONE LOSS = need exposure of root surface, bone loss, ging recession, exposure, demin (is there bone loss?), extend doesnt follow CEJ/AB
burnout: spans CEJ and crest of AB (radioL spans that width)
What does Lamina Dura look like?
- crest
- ROpaque line con with tooth onto adj tooth
- where tooth is moving, LD is thicker, moving mesial= thicker
- LD of distal 44 vs mesial= less obvious bc angulation of beam is diff.
Comment on LD of 44…
Thicker lamina dura could mean what?
LD more visible mesially bc angle of beam
Thick: occlusal stress there
Tooth moving mesially, what do you see
thick mesial Lamina dura
After tooth loss what is visible?
Corticated bone persists after tooth gone. LD (edentulous)
What is the radiographic appearance of PDL space?
What is indicative of healthy PDL space?
-wide PDL space good
What is alveolar crest used to assess and what is considered a health measurement from CEJ?
ACrest= used to assess PD
Acrest 1.5-2mm from CEJ
Healthy crest (anterior vs posterior) vs PD (type of bone lost)
in post teeth wider contacts, AC is flatter
- ant= smaller contact so AC is pointy and sharper
IN PD= erosion of margin, horizontal loss of AC
AC healthy vs not
The alveolar crest is influenced by position of what? Why might it be angled?
tooth erupting
where is cortical bone?
btw buccal/lingual or palaltal/ buccal
diff btw bone max and mand
max= more vascular
mandibule= fewer trabaculae, walls thick
used to assess pulpal disease, jaw pathology, decrease in size of trabecullae
What is condensing osteitis and how does it appear?
Condensing osteitis is a periapical inflammatory disease that results from a reaction to a dental related infection. This causes more bone production rather than bone destruction in the area. The lesion appears as a radiopacity in the periapical area hence the sclerotic reaction
