A patient has bone loss on tooth #29. Radiograph shows caries at and below the CEJ. What is the most likely cause of the bone loss?

Correct answer: D. Caries extending to the pulp causing periapical/furcation bone loss

• A. INCORRECT — Aggressive periodontitis occurs typically in young patients with minimal plaque and affects first molars/incisors; the clinical picture here points to caries-induced pathology.
• B. INCORRECT — Trauma from occlusion (bruxism, fremitus) causes bone loss but is not the primary pathology when visible caries is present on the radiograph.
• C. INCORRECT — While periodontal disease causes bone loss, the radiograph in this scenario specifically shows caries as the primary pathology, making endodontic origin the most likely explanation.
• D. CORRECT — Caries at and below the CEJ can extend into the pulp, leading to pulpal necrosis and periapical pathology. Endodontic infection at the apex or furcation can cause angular/localized bone loss mimicking periodontal disease.