Generalised periodontitis in a poorly controlled smoker who wants one deep clean and antibiotics
A 44-year-old man attends for a routine examination. He has had type 2 diabetes for 6 years managed with metformin 1 g twice daily, and his most recent HbA1c is 9.4%. He smokes 15 cigarettes a day and has done so for 25 years. He brushes once daily with a medium brush and does no interdental cleaning. His gums bleed when he brushes and his upper front teeth have started to look longer. Plaque and bleeding scores are high. Probing depths are 5 to 7 mm on the first and second molars and 4 to 5 mm interproximally elsewhere, with generalised recession. Tooth 46 has grade II furcation involvement, grade II mobility and 60% radiographic bone loss; the remaining molars have 40 to 50% bone loss. Radiographs show horizontal bone loss and no periapical pathology. He asks you to carry out a full-mouth deep clean under sedation in one appointment and to give him antibiotics so that it is cured quickly.
1. Assign a periodontal diagnosis using the current classification and justify the stage and grade with the data given.
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Diagnosis: generalised periodontitis, Stage III, Grade C, currently unstable.
Stage III rather than II: interdental clinical attachment loss is 5 mm or more, bone loss extends into the middle third of the root and beyond, there is grade II furcation involvement on tooth 46, mobility grade II, and probing depths of 7 mm. These are severity and complexity factors that define Stage III. There is no information about tooth loss attributable to periodontitis or about bite collapse, so Stage IV is not supported on the present data.
Grade C rather than B:
- Direct evidence: HbA1c of 9.4% indicates poor glycaemic control, which is an explicit grade C modifier.
- Smoking: 15 cigarettes daily is 10 or more per day, which is an explicit grade C modifier.
- Indirect evidence: 60% bone loss at age 44 gives a bone-loss-to-age ratio of about 1.4, well above 1.0, which is consistent with rapid progression.
- Plaque levels do not modify grade but explain the current unstable state.
Extent: generalised, because more than 30% of teeth are involved.
This staging is not academic. It determines the treatment sequence, the decision about adjunctive antibiotics, the review interval and the prognosis you communicate. A Grade C patient with poorly controlled diabetes who continues to smoke will respond poorly to any mechanical treatment, so risk-factor control carries as much weight as debridement.
2. Set out your treatment sequence. Would you prescribe antibiotics, and would you arrange the single-visit deep clean under sedation?
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Sequence:
- Behaviour change first. Demonstrate the inadequacy of once-daily brushing, prescribe a powered or soft brush with modified Bass technique and daily interdental brushes sized to each space. Record plaque and bleeding scores so improvement can be shown.
- Risk-factor management. Give brief smoking cessation advice with referral to a cessation service. Write to his general practitioner requesting review of glycaemic control, explaining the bidirectional relationship between diabetes and periodontitis and that improving HbA1c improves periodontal outcomes. Do not make treatment conditional on perfect control.
- Subgingival instrumentation by quadrant or sextant under local anaesthesia over several visits, with time for the tissues to heal between visits.
- Re-assessment at 8 to 12 weeks with full probing, bleeding and plaque scores, then decide on further non-surgical therapy, surgical access, or extraction of teeth that are not responding.
- Supportive periodontal care at intervals based on risk, probably three-monthly given Grade C and diabetes.
Antibiotics: not routinely, and never as a substitute for debridement. Adjunctive systemic antibiotics may be justified in generalised Stage III/IV Grade C in a younger adult where the benefit is likely to outweigh the risks - for example amoxicillin with metronidazole for seven days - but only alongside full mechanical therapy, and after discussing it as an adjunct rather than a cure. They are not indicated for the plaque-induced gingivitis component and carry stewardship and resistance costs.
Single-visit deep clean under sedation: decline. Sedation adds risk without improving the microbiology, and a single visit does not allow the staged healing and reassessment that Grade C disease needs. Local anaesthesia is sufficient; if anxiety is genuine, address it separately with behavioural support.
3. He asks specifically about tooth 46 and whether the loose tooth must come out. How do you decide and how do you explain it?
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Decision: tooth 46 is currently of questionable prognosis and must not be condemned or committed before non-surgical therapy. Grade II furcation involvement, grade II mobility and 60% bone loss are adverse, but mobility often falls once inflammation resolves, and there is no periapical pathology, so root canal treatment is not indicated merely because the tooth is mobile.
Plan: treat 46 within the staged debridement, then reassess at 8 to 12 weeks. If residual probing depths of 7 mm or more persist with bleeding and furcation involvement, the options are surgical access and furcation management, tunnelling, root resection in selected cases, or extraction. Splinting is not a routine solution and does not treat the disease. If the tooth is retained, it can serve as a strategic abutment, but only if it is periodontally stable.
Explaining it honestly: show him the radiograph and the chart, state that the bone support is reduced by about 60% and the tooth is loose, that the goal of treatment is to control the disease rather than to restore lost bone, and that this particular tooth may still be lost. Explain that a cure in the sense he used - a single deep clean and a course of tablets - is not achievable, but that the disease can be controlled and further loss prevented.
Agree a written plan with review dates, and record that the prognosis of 46 was discussed and that the decision was deferred pending reassessment. This protects both the patient and the clinician if the tooth is later extracted.