A study examines vitamin C deficiency as a risk factor for periodontitis and reports a statistically significant association. What is the MOST appropriate interpretation?

Correct answer: D. Vitamin C deficiency is associated with, and may contribute to, the development of periodontitis

• A. Bacterial etiology and host/nutritional risk factors are not mutually exclusive; modern periodontal models are explicitly host-modified.
• B. Correcting a deficiency supports healing but does not cure periodontitis — mechanical biofilm removal remains the essential therapy.
• C. The primary ETIOLOGY of periodontitis is the dysbiotic subgingival biofilm interacting with the host immune response. Vitamin C status is a modifier, not the cause.
• D. Correct. A risk-factor study establishes ASSOCIATION and identifies a contributing/modifying factor. Vitamin C is required for collagen cross-linking; deficiency (scurvy) produces swollen, hemorrhagic gingiva and impaired periodontal connective tissue repair, so deficiency plausibly influences periodontal breakdown — as a modifying risk factor, not the sole determinant.