Which of the following is NOT one of the five types of carious lesions?

• A. Cervical burnout
• B. Proximal
• C. Root
• D. Occlusal

Answer: (A)

The main idea is distinguishing true carious lesions by surface from artifacts that can look like caries on imaging. True caries are demineralization processes that occur on specific tooth surfaces, while cervical burnout is not a real carious lesion.

Cervical burnout is an artifact seen near the cemento-enamel junction. It appears as a radiolucent area due to the geometry and differential scanning of dentin and enamel, not because dentin has actually demineralized. So, even though it can mimic decay on a radiograph, there is no actual carious process happening there.

In contrast, the other surfaces described correspond to genuine caries locations: proximal caries occur on the interproximal surfaces between teeth, occlusal caries develop on the chewing surfaces in the pits and fissures, and root caries affect exposed root surfaces where cementum and dentin are susceptible. These reflect true loss of mineral content due to caries activity.

So cervical burnout isn’t counted as a carious lesion, making it the correct answer for NOT being one of the five types.