Final; Radiographic Examination Flashcards
True or False
Radiographs can be used to diagnose periodontal disease
False; they are not diagnostic
What is correlation of percentage of bone loss seen radiographically, severity, and CAL of slight, moderate, and severe
< 20% → slight → 1-2mm CAL
21-49% → moderate → 3-4mm CAL
> 50% → severe → 5+mm CAL
What is the equation for assessing bone loss
(CEJ to crest of bone height - 2) / (CEJ to apex - 2)
The height of the crest lies at a level approx ______ below the level of the CEJs of adjacent teeth
2mm
What is the difference between 3 wall, 2 wall, and 1 wall bony defects
3 wall remains 3 remaining walls surrounding the bone loss, etc.
A two walled buccal and lingual walled defect is also know as what and can be seen radiographically
crater
This is an infrabony lesion involving one or more surfaces of supporting bone
moat-like defect
True or False
Radiographically, you can see bone loss in the furcation area
True; its a furcation radiolucency
This shows up as a radiolucent space between the root and the alveolar bone
PDL space
What can you determine about the PDL space on radiographs
whether its widened (more wide at apex and coronaly) as well as a thickened radicular lamina dura
Where is there more trabeculae
superiorly and anteriroly
These appear as radiolucent lines bordered by a thin radioopaque line
vessels within the interdental bone
This may be mistaken for an endodontic lesion in the proximity of the 1st permolars/1st molar
mental foramen
If the roots are less than ____ apart, periodontal bone loss will affect the entire interproximal
2.5mm
What is the crown to root ratio
it is the ratio of the length of the tooth outside of bone to the length of tooth in bone
