12. Caries Flashcards
What is the importance of radiographs in caries detection?
They help track the progression or arrest of lesions and assess their depth.
What level of mineral loss is required for a lesion to be visible radiographically?
30-35% mineral loss is required for lesions to be visible.
How do demineralization and remineralization appear on radiographs?
Demineralization appears darker (radiolucent); remineralization appears lighter (less radiolucent).
How does X-ray beam direction affect shadow density?
Horizontal alignment creates denser shadows; inclined beams reduce shadow density.
What is the difference between active and arrested caries?
Active caries are progressive and radiolucent; arrested caries appear as radiolucent scars but need follow-up images to assess activity.
Why do radiographs underestimate caries depth?
Shallow enamel lesions often don’t cast shadows, and the depth can only be judged accurately with follow-ups.
What are horizontal and vertical angulation errors in caries detection?
Horizontal errors cause tooth overlap; vertical errors distort anatomy and carious lesions.
What is cervical burnout and how can it mimic caries?
A radiolucent area near the CEJ caused by tissue density differences, not caries.
What is the Mach-Band Effect in radiographs?
A visual artifact caused by differential stimulation of retinal receptors, mimicking caries.
Why are bitewing radiographs useful for detecting caries?
They have less radiation and are reliable for detecting interproximal caries and monitoring early lesions.
How does CBCT compare to bitewings for caries detection?
CBCT provides higher resolution but is affected by metal artifacts and has higher radiation, making bitewings better for routine caries detection.
How should caries progression be monitored over time?
Record lesion depth at each exam and compare changes to monitor progression.
What are radiographic scars and are they a concern for the tooth?
Remineralized lesions that appear as scars on X-rays are not a threat to the tooth.
