Diagnosis of caries and periodontal disease Flashcards
what does ALARP stand for?
As Low As Reasonably Possible
When will caries appear on a radiograph?
when there has been around 30-40% demineralisation
can you tell the difference between an arrested and an active carious lesion on a radiograph?
no
what is the negative point about 2D image
you can’t tell where the caries is buck-lingually
what are the 2 recommended radiographs to detect caries?
- bitewings - horizontal
2. paralleling periapicals
give 3 requirements of the paralelling technique
- tooth and film parallel to each other
- X-ray beam at 90 degrees to the tooth/film
- long cone used
what isn’t caries but can look like caries on a radiograph?
cervical burn out
what is cervical burn out also called?
cervical translucency
define cervical burn out
an artifactual phenomenon created by the anatomy of the teeth and the VARIABLE PENETRATIONS of the X-ray beam
how can you tell the subtle difference between caries and cervical burnout?
- cervical burn out usually affects all teeth in the radiograph
- cervical burn out is more triangular in shape (caries is more saucer shaped
you are more likely to get cervical burnout if…
the exposure factors are increased
name 2 more limitations of caries diagnosis, discluding a 2D image
- anatomy
2. technique
the more tooth tissue the X-ray photon passes through, the … the image
lighter
where on the tooth is the least tooth tissue? what effect does this have on the radiograph
the interproximal area will appear darker
radiographs provide …… evidence of dental disease
retrospective
