Which radiographic feature helps distinguish a vertical root fracture from periodontal disease?

• A. Uniform horizontal bone loss around multiple teeth
• B. A discrete fracture line through the root with pain on biting
• C. Widened periodontal ligament around the tooth
• D. Generalized bone loss around the tooth due to periodontal disease

Answer: (B)

The key idea is that vertical root fractures produce a definite fracture line through the root and are often associated with pain when the tooth is bitten. Radiographs may show a narrow radiolucent line running along the root, sometimes accompanied by localized bone loss along the fracture. This contrast with periodontal disease, where bone loss tends to be generalized or localized around the tooth without a visible fracture line on the root. The presence of a discrete fracture line through the root explains a localized deep pocket or sinus tract and bite-induced pain, distinguishing it from the diffuse, pattern-based bone loss seen with periodontal disease.