Newly Presenting Stage III Periodontitis in a Smoker With Poorly Controlled Diabetes

Stage III, Grade C.

Staging (severity and complexity of management)

• Interdental clinical attachment loss of 5 mm or more at multiple sites, probing depths of 5 to 7 mm, and radiographic bone loss of 30 to 40% extending into the middle third of the root and beyond. This exceeds Stage II, which is defined by attachment loss of 4 mm or less with coronal-third bone loss.
• Stage III is defined by attachment loss of 5 mm or more, bone loss to the middle or apical third, furcation involvement grade II or III, and no more than four teeth lost to periodontitis. The grade II furcation and mobility grade II on 46 fit Stage III.
• Stage IV would require five or more teeth lost to periodontitis, masticatory dysfunction or bite collapse - none documented here.
• The 8 mm palatal pocket on 16 is an added complexity factor.

Grading (rate of progression and risk)

• Bone loss divided by age is about 35/45 = 0.78, which on its own suggests grade B.
• However, smoking 10 or more cigarettes daily is a recognised grade modifier that shifts the grade to C, and an HbA1c of 8.6% supports that. Grade C means rapid progression and high risk of further loss.
• Record the grade together with the modifiers, so that the reassessment at 8 to 12 weeks is compared against a stated baseline rather than against memory.

Also record full-mouth plaque and bleeding scores, request a current HbA1c from his physician, and note that the diagnosis must be re-staged after initial therapy.

Cause-related therapy first; surgery last.

Visit 1 (today): no instrumentation. Full periodontal chart and radiographs, oral hygiene instruction with correctly sized interdental brushes and a demonstration, supragingival professional plaque removal, smoking-cessation referral, a letter to his physician requesting a current HbA1c and review of glycaemic control. Explain that with HbA1c 8.6% and 15 cigarettes a day, treatment will work less well if these are not addressed - the periodontal–diabetes relationship runs in both directions. Defer the extraction request until the response to therapy is known.

Weeks 1 to 6. Subgingival instrumentation quadrant by quadrant (or full mouth) under local anaesthesia, with oral hygiene re-instruction at every visit, including cleaning the furcation on 46.

8 to 12 weeks (reassessment). Repeat the full chart, plaque and bleeding scores, and compare. This is where decisions are made.

If residual pockets remain. Deep bleeding pockets at 46 with grade II furcation mean a discussion of options: further non-surgical therapy, furcation surgery, or extraction. Mobility grade II alone is not an indication for extraction if the pocket is controlled and there is no progressive loss.

From 3 months. Supportive periodontal therapy at 3-month intervals, because he is grade C and a smoker, with smoking and HbA1c reviewed at each visit.

On doing everything in one appointment: it is possible, but the outcome depends on his plaque control and risk factors, not on the speed of scaling. Never let the single-visit request replace oral hygiene instruction.

Antibiotics are an adjunct, never a substitute.

• They are justified in Stage III or IV periodontitis with deep residual pockets after mechanical therapy, particularly in a patient with diabetes. The best-supported regimen is amoxicillin 500 mg plus metronidazole 400 mg three times daily for seven days, taken with or immediately after complete subgingival instrumentation.
• They are not justified as monotherapy, not to compensate for incomplete instrumentation, and not before he has shown he can control plaque. With a high plaque score the gain is temporary and resistance is driven.
• Explain the risks: gastrointestinal upset, candidosis, Clostridioides difficile, allergy, and antibiotic stewardship.
• Practical plan: mechanical therapy first, reassess at 8 to 12 weeks, and discuss the adjunct only if deep bleeding pockets persist.

Counselling

• Diabetes: untreated periodontitis makes glycaemic control harder, and periodontal treatment produces a small but real improvement in HbA1c. An HbA1c of 8.6% on metformin alone means his physician should review him - refer rather than adjust anything yourself.
• Smoking: 15 a day roughly doubles the rate of attachment loss and blunts the benefit of treatment. Give brief advice, record it, refer to a cessation service, and revisit it without judgement at every appointment.
• The extraction request: explain that mobility is often reversible once inflammation is controlled, and that removing the loose teeth would not treat the disease, only move where it happens. Set the goal as stabilisation, not cure, and make clear that 3-monthly maintenance is part of the treatment rather than an optional extra.