Advanced periodontal disease in a smoker with poorly controlled diabetes: keep or extract

Stage: III (possibly IV if function is compromised)

• Interdental attachment loss in the worst site (the 9 mm pocket on the lower right first molar) is at the severe end: the pocket plus the reported 40% bone loss puts the site in the severe category, and stage III requires attachment loss of 5 mm or more with no more than four teeth lost to periodontitis.
• The tooth loss matters for staging: one molar already lost for periodontal reasons. If that tooth loss is attributable to periodontitis and fewer than five teeth have been lost, stage III fits; if five or more have been lost, or if there is collapse of the occlusion or severe ridge defect, it becomes stage IV. Document the reason for each missing tooth rather than assuming.
• Complexity factors: grade II furcation involvement and mobility grade II push this toward stage III/IV because they demand surgical or multidisciplinary management, not just scaling.

Grade: C

• Grade is a rate-of-progression judgement, and here two modifiers point the same way: smoking 15/day and HbA1c 8.4% are both risk-factor modifiers that shift the grade upward. Neither is a severity measure - they are risk measures - and it is a common error to use bone loss percentage alone without checking for these.
• If there is no previous radiograph to calculate bone loss/age, grade provisionally on the risk modifiers and say so explicitly.

What the classification is for: it is not a label, it is a predictor. A stage III grade C case with two unaddressed risk factors justifies an intensive, monitored approach rather than immediate heroic reconstruction.

Do not decide yet - and be explicit about why. The 9 mm distal pocket with bleeding, grade II furcation and grade II mobility is a genuinely guarded site, but the response to a first course of therapy is the single most useful prognostic test you have, and it has not been done. Committing to extraction or to surgery before that is guesswork.

Sequence

1. Assess the distal 9 mm pocket properly. Is it a true infrabony defect, a furcation-associated lesion, or partly a restorative/plaque-retention problem? Probe charting, a long-cone or bitewing with a probe in situ, and pulp sensibility testing are needed - a non-vital molar with a narrow isolated deep pocket is a different disease with a different answer.
2. Full-mouth non-surgical therapy with oral hygiene instruction including interdental brushes sized to each space. Plaque score 45% with no interdental cleaning predicts failure of anything more sophisticated; surgery on a patient who cannot clean is a reliable way to produce a worse pocket.
3. Reassess at 6-8 weeks with full probing depths and bleeding scores. The question then becomes concrete: did the 9 mm site reduce?

Decision rules

• If the pocket resolves to 5 mm or less with no bleeding and the furcation is manageable, retain and maintain.
• If the furcation remains grade II with a deep residual pocket that the patient cannot access, the choice is between furcation plasty/open debridement and extraction; the tooth is often a maintenance liability but not necessarily an immediate extraction.
• If mobility increases, the pocket persists at 8-9 mm or a vertical defect worsens, extraction is the honest answer. The second molar should be assessed as a future abutment rather than assumed to be sound.

Explain that the patient's own cleaning is the variable that decides this, not the choice of instrument.

Smoking

• Smoking is a dose-related risk factor for both periodontitis progression and for healing after any surgery. Fifteen a day is enough to impair neutrophil function and reduce gingival blood flow.
• It also blunts the clinical signs you rely on - bleeding on probing is reduced in smokers - so a 'quiet' mouth in a smoker can be falsely reassuring. Judge on probing depths and attachment change, not on bleeding alone.
• Be direct: the highest-value intervention available to this patient is stopping smoking, and referral to a cessation service is part of periodontal treatment, not an optional extra. Record it.

Diabetes

• HbA1c 8.4% (roughly 68 mmol/mol) indicates suboptimal control, and there is a two-way relationship: periodontitis worsens glycaemic control and treatment improves it. Say so - it is a motivator.
• Liaise with his diabetes team; this is not a reason to withhold treatment, but it is a reason to avoid elective surgery while control is poor and to be alert to slower healing and infection.

The implant question Answer it directly and without hedging: an implant is not a way of escaping periodontal disease. The same risk factors that threaten this molar - smoking, hyperglycaemia, plaque control - also raise peri-implantitis and implant loss rates, and peri-implantitis is harder to treat than periodontitis because there is no ligament. State the requirements: completion of therapy, a sustained plaque score, smoking cessation or at least reduction, better glycaemic control, and a maintenance programme he will attend. Give the honest comparison of a maintained molar versus an implant, including that the molar is free. Offer no implant plan until the reassessment.