Periodontal Medicine and Systemic Interrelationships
What this domain tests
Bidirectional relationships between periodontal disease and systemic conditions, medication effects, and medically complex patient management.
Established associations
- Diabetes and periodontitis are bidirectional. Hyperglycemia worsens periodontal inflammation; periodontal therapy may modestly improve glycemic control. HbA1c of 7.0% or more upgrades grade.
- Cardiovascular disease: periodontal disease is associated with atherosclerotic risk, but causality is not established; periodontal therapy does not replace cardiovascular risk management.
- Adverse pregnancy outcomes: an association exists; treatment during pregnancy is safe and often recommended.
- Smoking is the strongest modifiable risk factor; it masks bleeding and impairs healing.
- Drug-induced gingival overgrowth: phenytoin, nifedipine, cyclosporine, and valproate.
- MRONJ: antiresorptives and antiangiogenics; risk rises with duration, intravenous potency, and invasive procedures.
- Antibiotic prophylaxis for infective endocarditis follows cardiac indications, not routine periodontal procedures for prosthetic joints.
Worked example
A patient with type 2 diabetes, HbA1c 9.2%, presents with generalized bleeding and 6-mm pockets. The plan is SRP, oral hygiene, and coordination with the physician for glycemic control. Because HbA1c is 7.0% or more, the grade is C. Elective surgery is deferred until control improves.
Traps
- Claiming periodontal treatment prevents heart attacks.
- Stopping anticoagulants without medical advice; check INR and coordinate.
- Prescribing antibiotics for prosthetic joints routinely.
- Missing medication-related overgrowth or MRONJ risk.