10.4 Applied Periodontal Pathology: Lesion Stages, Necrotizing Disease, Abscesses and Gingival Enlargement
Key Takeaways
Page and Schroeder described the initial lesion (2-4 days, neutrophils), the early lesion (4-7 days, T lymphocytes), the established lesion (2-3 weeks, plasma cells and B cells) and the advanced lesion with attachment and bone loss.
Necrotizing gingivitis presents with painful, bleeding, punched-out interdental papillae covered by pseudomembrane and is linked to stress, smoking, malnutrition and immunosuppression including HIV.
A periodontal abscess is drained through the pocket and debrided; systemic antibiotics are reserved for spreading infection or systemic signs, and pulp testing separates it from a periapical abscess.
Phenytoin, cyclosporine and calcium channel blockers such as nifedipine and amlodipine cause drug-influenced gingival enlargement, which is worsened by plaque and treated by plaque control, drug review with the physician and surgical reduction.
Papillon-Lefevre syndrome, leukocyte adhesion deficiency, Down syndrome, neutropenia and hypophosphatasia are systemic conditions that produce severe early periodontal destruction or premature tooth loss.
The blueprint subsection applied pathology of periodontal diseases asks you to understand the biological processes behind the clinical picture. The 2017 classification also groups several conditions that SDLE vignettes like to use: necrotizing diseases, periodontal abscesses, drug-influenced enlargement and periodontitis as a manifestation of systemic disease.
Page and Schroeder: From Gingivitis to Periodontitis
| Stage | Timing after plaque accumulation | Dominant cells | Key features |
|---|---|---|---|
| Initial lesion | 2-4 days | Neutrophils | Vasculitis beneath the junctional epithelium, increased crevicular fluid, early collagen loss; subclinical |
| Early lesion | 4-7 days | T lymphocytes | Lymphoid infiltrate, fibroblast damage, rete peg proliferation; clinical gingivitis (redness, bleeding) |
| Established lesion | 2-3 weeks | Plasma cells and B cells | Continued collagen loss, pocket epithelium forms; chronic gingivitis that may remain stable for years |
| Advanced lesion | Variable | Plasma cells | Apical migration of junctional epithelium, attachment and bone loss: periodontitis |
The transition from established to advanced lesion is driven by a dysbiotic biofilm and a susceptible host response (cytokines, MMPs and RANKL), as described in the microbiology section. Gingivitis is reversible; attachment loss is not.
Modifying Factors in Plaque-Induced Gingivitis
- Sex hormones: puberty, pregnancy and some oral contraceptives exaggerate the response to plaque; pregnancy gingivitis and pyogenic granuloma (pregnancy epulis) often regress after delivery.
- Hyperglycemia: poorly controlled diabetes intensifies inflammation.
- Leukemia: gingival enlargement, bleeding and ulceration from infiltrating leukemic cells; may be the first sign of acute leukemia.
- Vitamin C deficiency (scurvy): swollen, bleeding, hemorrhagic gingiva and poor healing.
- Smoking masks bleeding and redness despite ongoing destruction.
Necrotizing Periodontal Diseases
| Condition | Features |
|---|---|
| Necrotizing gingivitis (NG) | Painful, bleeding gingiva; punched-out, cratered papillae with gray pseudomembrane; fetor; sometimes fever and lymphadenopathy |
| Necrotizing periodontitis (NP) | Necrosis with rapid attachment and bone loss |
| Necrotizing stomatitis (NS) | Necrosis extending beyond the gingiva into mucosa and bone |
Predisposing factors include psychological stress, smoking, poor oral hygiene, malnutrition, sleep deprivation and immunosuppression (HIV infection). The lesions are dominated by fusiform bacteria, Prevotella intermedia and spirochetes.
Management: gentle superficial debridement under local anesthesia (ultrasonic debridement as tolerated), chlorhexidine 0.12-0.2% rinses, analgesia, nutrition and smoking advice, and metronidazole when there is systemic involvement (fever, lymphadenopathy) or immunosuppression. Review within 24-48 hours, then complete periodontal therapy; consider HIV or other testing when the history suggests it.
Periodontal Abscess and Pericoronitis
Periodontal abscess: a localized purulent infection within the gingival wall of a pocket. It occurs in periodontitis patients (acute exacerbation, after incomplete scaling that leaves calculus deep in a pocket, after systemic antibiotics) or in non-periodontitis patients (impaction of a foreign body such as a popcorn hull or toothbrush bristle, orthodontic forces, root malformations).
| Feature | Periodontal abscess | Periapical (endodontic) abscess |
|---|---|---|
| Pulp vitality | Usually vital | Non-vital |
| Probing | Deep pocket communicating with the abscess | Usually normal probing (unless draining through the sulcus) |
| Swelling location | Lateral, near the gingival margin | Apical region, vestibular |
| Radiograph | Lateral bone loss | Periapical radiolucency |
Management: drainage through the pocket, debridement, irrigation and occlusal relief; antibiotics only for spreading infection or systemic signs. Pericoronitis of a partially erupted mandibular third molar is managed by irrigation under the operculum, relief of trauma from the opposing tooth, chlorhexidine, antibiotics if systemic signs or spreading infection, and later extraction or operculectomy.
Non-Plaque-Induced Gingival Conditions
The 2017 classification separates gingival lesions that are not caused by plaque, although plaque can worsen them:
| Group | Examples |
|---|---|
| Genetic and developmental | Hereditary gingival fibromatosis |
| Specific infections | Primary herpetic gingivostomatitis, candidiasis, necrotizing infections |
| Inflammatory and immune | Lichen planus, mucous membrane pemphigoid, pemphigus vulgaris, lupus erythematosus, erythema multiforme, allergic reactions |
| Reactive processes | Fibrous epulis, pyogenic granuloma, peripheral giant cell granuloma |
| Neoplasms | Leukoplakia with dysplasia, squamous cell carcinoma, leukemic infiltrates |
| Traumatic lesions | Toothbrush trauma, chemical burns, thermal injury |
| Pigmentation | Physiological melanin, smoker's melanosis, amalgam tattoo |
Desquamative gingivitis (red, glazed, peeling attached gingiva) is a clinical pattern most often caused by mucous membrane pemphigoid or erosive lichen planus and needs biopsy with direct immunofluorescence rather than more scaling.
Gingival Enlargement
| Cause | Typical drugs or conditions | Notes |
|---|---|---|
| Anticonvulsants | Phenytoin (affects about half of patients in older studies) | Begins at interdental papillae, firm and fibrotic |
| Immunosuppressants | Cyclosporine | Tacrolimus substitution may reduce enlargement |
| Calcium channel blockers | Nifedipine, amlodipine, verapamil, diltiazem | Common in hypertensive patients |
| Hereditary gingival fibromatosis | Genetic | Dense fibrous enlargement covering teeth |
| Leukemia, pregnancy, scurvy | Systemic | Soft, hemorrhagic enlargement |
Drug-influenced enlargement is worsened by plaque. Management: plaque control and periodontal debridement, consultation with the physician about an alternative drug (never stop the drug yourself), and gingivectomy or flap surgery for residual enlargement, with recurrence likely if the drug continues.
Periodontitis as a Manifestation of Systemic Disease
| Condition | Mechanism | Dental presentation |
|---|---|---|
| Papillon-Lefevre syndrome | Cathepsin C mutation, neutrophil dysfunction | Palmoplantar hyperkeratosis; loss of primary and permanent teeth |
| Leukocyte adhesion deficiency | Integrin defect, neutrophils cannot leave vessels | Severe early periodontitis |
| Down syndrome | Immune and neutrophil defects | Severe periodontitis in young adults |
| Neutropenia (cyclic or chronic) | Low neutrophil counts | Ulceration, rapid destruction |
| Hypophosphatasia | Low alkaline phosphatase, defective cementum | Premature exfoliation of primary teeth with intact roots |
| Diabetes | Hyperglycemia, AGE-RAGE axis | Risk factor that worsens grading |
Exam Traps
- Punched-out papillae with pain and bleeding in a stressed smoker suggest necrotizing gingivitis, not ordinary gingivitis.
- A swelling next to a vital tooth with a deep pocket is a periodontal abscess.
- Stopping cyclosporine without the transplant physician is dangerous; always consult.
A gingival biopsy taken after about three weeks of undisturbed plaque accumulation shows an infiltrate dominated by plasma cells, with continued collagen loss but no bone loss. Which Page and Schroeder stage does this represent?
The early lesion dominated by T lymphocytes at 4 to 7 days
The initial lesion dominated by neutrophils at 2 to 4 days
The established lesion, dominated by plasma cells and B cells
The advanced lesion with attachment and alveolar bone loss
A 24-year-old student who smokes heavily presents during examinations with very painful, bleeding gingiva, punched-out interdental papillae covered by gray pseudomembrane, and halitosis. He has no fever. What is the most appropriate initial management?
Reassurance only, because necrotizing gingivitis always resolves untreated
Gentle debridement under local anesthesia, chlorhexidine rinses and close review
Immediate full-mouth flap surgery to remove the necrotic papillae and pseudomembrane completely
Systemic amoxicillin alone for 14 days without any mechanical debridement
A kidney transplant recipient taking cyclosporine has firm gingival enlargement covering one-third of the crowns. Which management plan is most appropriate?
Plaque control and debridement, physician review of the drug, then excise residual tissue
Perform gingivectomy immediately and repeat it every six months without any drug review
Prescribe phenytoin to counteract the cyclosporine effect on the gingival fibroblasts
Stop cyclosporine for two weeks before gingivectomy so the tissue can shrink spontaneously
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