Cariology and Prevention 2 Practice Test 2026 – Comprehensive Exam Prep

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What radiographic feature best differentiates root caries from cervical burnout?

Root caries shows a definite saucer-shaped radiolucency on root surfaces; cervical burnout shows a radiolucent zone with ill-defined margins

The key idea is how the lesion looks on a radiograph. True root caries forms a definite, saucer-shaped radiolucency on the root surface as it carves into dentin and cementum, with relatively well-defined borders. Cervical burnout, by contrast, appears as a radiolucent area at the cervical region with ill-defined, fuzzy margins due to beam geometry and thinner dentin near the CEJ. So the distinguishing feature is the shape and border clarity: a well-defined saucer-shaped lesion on the root indicates root caries, while an ill-defined cervical radiolucency suggests burnout.

Root caries radiopaque; cervical burnout radiolucent

Root caries on occlusal; burnout on proximal

Root caries on enamel; burnout on cementum

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