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Caries dyes: fusayama differentites
two layers of carious dentin
outer layer dentin
- irreversible denaturation of collagen
- UN recalcifiable
inner layer dentin
- partially decalcified
- sound collagen fibers
Where is infected and affected dentin?
affected is the inner layer with intratubular dentin barrier behind it.
"infected" large numbers bacteria
Because of carcinogenic, fuschin dye was replaced by acid red solution.
Acid RED is
1% acid red in polypropylene glycol
Acid red stains infected dentin which
enhances complete removal of infected dentin and More accurate diagnosis
Prevent over removal
Traditional detection methods have
low specificity (high false P)
CARIES DYES should reduce
unnecessary removal of sound dentin/ ensure removal of affected dentin
What do CDDs stain?
organic matrix/collagen of less mineralized dentin NOT BACTERIA
Evidence says that CDDs
have low specificity, also high false P
What are common sites of false Ps?
- dentin at DEJ
- Dentin at pulp
B/c higher percentage of organic matrix here
Intense CDD staining means
severely disease dentin
CDDs on enamel
NO. They are non-specific protein dyes.
In addition to teeth CDDs can also stain...
food, pellicle, organic stuff
Fiber optic transillumination is designed for?
Early detection of caries lesions
FOTI use what principle to distingusih b/t normal and carious enamel?
The principle of light scattering
What tissue has more scattering and absorption of light?
What tissue has more transmission?
T/F FOTI cannot tell b/t enamel and dentin lesions even though it is in 3D.
Enamel lesion vs dentin lesion color:
gray shadow vs orange-brown bluish shadow
How is FOTI different from radiographs
Uses only high intensity white light, not ionizing radiation
FOTI performance on proximal lesions compared to BWs
- High specificity
- Lower sensitivity
But not statisically different
T/F Over all FOTI is better than visual exam alone.
How is FOTI on occusal lesions?
- Technique sensitive
- Lower performance in presence of stain
FOTI plus CCD intraoral camera has image relay mirror.
If DIFOTI transilluminated the facial side...the image is on the
What captures the incipient caries inside the mouth?
Image receiving mirror received the light from the FO light source
How can xrays miss a spot that is captured by FOTI?
- tooth too thick to capture caries on other side via xray.
- FOTI light source from facial side captures caries on the lingual side.
DIFOTI in vivo studies
- Minimally available.
- In vitro high sensitivity for Proximal lesions for EARLY caries
T/F DIFOTI with xrays improves accuracy.
Why do DIFOTI not replace xrays?
DIFOTI cannot be used for depth determination.
What is a physical limitiation fo FOTI?
amount of light that can be amplified
FOTI excellent for
- suspicious fissures and cracks
- confirming cracks