What is the KEY distinguishing feature between idiopathic osteosclerosis and condensing osteitis?

Correct answer: A. The pulp vitality status of the associated tooth

• A. Correct. Both appear as localised radiopacities in the periapical region, and they can look identical. The discriminator is PULP STATUS. CONDENSING OSTEITIS is a REACTIVE sclerosis caused by low-grade chronic pulpal inflammation, so the associated tooth is NON-VITAL or has a deep carious lesion or restoration. IDIOPATHIC OSTEOSCLEROSIS (dense bone island, enostosis) is a developmental variant with NO inflammatory cause, and the associated tooth is entirely VITAL and caries-free. Always test the pulp.
• B. Neither reliably presents with a distinguishing corticated border.
• C. Both occur across a wide age range with overlap.
• D. Both lesions appear as dense radiopacities; density alone does not separate them.