A diabetic patient with HbA1c of 9-10 has generalized tooth mobility. What is the primary etiologic factor for the periodontal disease?

Correct answer: B. Bacterial plaque biofilm, with diabetes as the major modifying risk factor

• A. Occlusal trauma can accelerate existing attachment loss but does not initiate periodontitis.
• B. Correct. Plaque biofilm remains the necessary primary etiologic agent for periodontitis. Uncontrolled diabetes is the dominant modifying factor — impairing neutrophil function, driving AGE formation and amplifying the inflammatory response — but it does not initiate disease without plaque.
• C. Genetics modifies susceptibility but is not the primary etiologic agent.
• D. Diabetes cannot produce periodontitis in the absence of a bacterial biofilm.