Which caries type is commonly indicated by a radiolucent line beneath enamel on radiographs?

Which caries type is commonly indicated by a radiolucent line beneath enamel on radiographs?

• A. Occlusal caries
• B. Proximal caries
• C. Root caries
• D. Recurrent caries

Answer: (A)

Radiographs show caries patterns based on where demineralization occurs. An early lesion in the enamel of occlusal pits and fissures often appears as a slender radiolucent line running just beneath the enamel surface along the fissure. This linear radiolucency reflects caries starting in the enamel of the occlusal anatomy and progressing toward dentin, which is why it’s most commonly associated with occlusal caries. Other caries types have different radiographic appearances: proximal caries tend to show radiolucency at the contact areas between teeth, root caries appear near the cementum at the cervical/root area, and recurrent caries show radiolucencies at restoration margins. Therefore, a radiolucent line beneath enamel on radiographs is best characteristic of occlusal caries.

Radiographs show caries patterns based on where demineralization occurs. An early lesion in the enamel of occlusal pits and fissures often appears as a slender radiolucent line running just beneath the enamel surface along the fissure. This linear radiolucency reflects caries starting in the enamel of the occlusal anatomy and progressing toward dentin, which is why it’s most commonly associated with occlusal caries. Other caries types have different radiographic appearances: proximal caries tend to show radiolucency at the contact areas between teeth, root caries appear near the cementum at the cervical/root area, and recurrent caries show radiolucencies at restoration margins. Therefore, a radiolucent line beneath enamel on radiographs is best characteristic of occlusal caries.