A New Patient With Suppressed Bleeding and Drug-Induced Enlargement
Mr. K, 58, is a new patient booked for a 45-minute comprehensive examination. He has type 2 diabetes with an HbA1c of 8.9% drawn last week, smokes 20 cigarettes a day, and finished a 10-day course of amoxicillin–clavulanate for sinusitis 12 days ago. He smoked one cigarette in the parking lot 15 minutes before entering. Charting shows generalized marginal erythema with rolled, firm margins, a plaque score of 78%, but bleeding on probing (BOP) of only 11%. Probing depths are 3–4 mm anteriorly and 5–7 mm on all second molars and the mesial of 36. Bitewing and panoramic images show approximately 40% horizontal bone loss on 16, 26, 36, and 46. His physician added amlodipine 10 mg three months ago. He reports no tooth loss, no family history of periodontitis, no pain, brushes once daily without interdental cleaning, and asks whether he just needs a cleaning.
1. Which assessment findings are likely distorted by transient factors, and how should that change your interpretation and next steps?
Read the worked answer
Three findings cannot be treated as baseline data:
- BOP of 11% is falsely reassuring. A course of amoxicillin–clavulanate finished 12 days ago suppresses gingival inflammation and bleeding for weeks, and nicotine from a cigarette 15 minutes ago causes transient vasoconstriction that further blunts bleeding. The visible erythema and rolled margins contradict an 11% score, so the number reflects pharmacology and timing, not periodontal health.
- Probing depths may be inflated by pseudopockets. Amlodipine, started three months ago, is a recognized cause of drug-influenced gingival enlargement, which produces firm, rolled margins and deep readings without attachment loss.
- The plaque score is valid only for today. It is useful for teaching but not as a measure of habitual hygiene.
Next steps: record each confounder in the note; do not label the BOP as baseline; re-chart BOP and depths at a reevaluation at least 4–6 weeks after the antibiotic, asking him to refrain from smoking for at least one hour before probing. Obtain full-mouth clinical attachment levels, furcation and mobility data so that attachment loss, not pocket depth alone, drives the diagnosis. Tell him plainly that 11% is not evidence of health and that the numbers will be rechecked.
2. Does this patient have gingivitis or periodontitis? What data are still needed to assign stage and grade?
Read the worked answer
Periodontitis, not gingivitis. Gingivitis is confined to the gingiva with no attachment loss; this patient has approximately 40% horizontal bone loss on four teeth plus 5–7 mm pockets. Bone loss on radiographs establishes past or present periodontitis regardless of today's suppressed BOP.
Still needed for staging:
- Interdental clinical attachment level at the worst site. CAL of 5 mm or more with bone loss to the middle third of the root fits Stage III; Stage IV requires five or more teeth lost to periodontitis, masticatory dysfunction, or secondary occlusal trauma. He reports no tooth loss, so Stage III is likely, but verify.
- Complexity factors: furcation involvement, vertical defects, mobility, ridge deficiencies, and whether deep readings are true pockets or enlargement pseudopockets.
For grading: calculate radiographic bone loss divided by age at the worst tooth (about 40/58, roughly 0.7). Both grade modifiers are present and each shifts him upward: current smoking of at least 10 cigarettes daily, and HbA1c of 8.9%, which is at or above the 7.0% threshold for a grade C modifier. Grade C is the defensible provisional grade. Record the pack-year history and confirm the HbA1c date with his physician.
3. He wants to be finished within 45 minutes. How do you structure today's visit and what do you tell him?
Read the worked answer
Triage by risk rather than by his stated goal. In 45 minutes you can complete the medical and dental history, take blood pressure, expose needed radiographs, chart full-mouth CAL, furcation and mobility, provide oral hygiene instruction with interdental demonstration, and explain the findings. Definitive instrumentation is not appropriate today because the baseline BOP is chemically and acutely suppressed, the enlargement may be medication-related, and diabetes control is poor.
Tell him three things: he has periodontitis with bone loss, not simply calculus needing a cleaning; his 11% bleeding score is artificially low today and will be re-measured; and treatment will be scheduled in quadrants with a reevaluation 4–6 weeks later. Explain that his HbA1c of 8.9% and smoking both worsen periodontal risk and response to treatment.
Coordinate care: send a letter to his physician requesting current HbA1c and asking whether amlodipine can be substituted, without advising him to stop any medication himself. Document the conversation and his response. Schedule the first quadrant and the reevaluation before he leaves, and note that a single 45-minute slot cannot substitute for a diagnostic visit.