10.2 Managing Oral Mucosal and Osseous Diseases
Key Takeaways
- Erosive lichen planus is managed with topical corticosteroids and long-term monitoring because it carries a small but real risk of malignant transformation
- Pemphigus vulgaris shows suprabasilar acantholysis with a positive Nikolsky sign and requires urgent referral, because untreated disease was historically fatal
- Recurrent aphthous stomatitis affects only non-keratinized movable mucosa, whereas recurrent intraoral herpes affects keratinized mucosa bound to bone
- Angular cheilitis is usually a mixed Candida and Staphylococcus infection, and treatment must also correct the underlying cause such as reduced vertical dimension or nutritional deficiency
- Medication-related osteonecrosis of the jaw is defined by exposed bone persisting more than eight weeks in a patient with antiresorptive or antiangiogenic exposure and no history of head and neck radiation
Managing Oral Mucosal and Osseous Diseases
Why this matters on the INBDE: Recognizing a lesion earns half the credit; the examination asks what you do next. Clinical Content area 23 sits in Oral Health Management — the 42% component — precisely because management, not naming, is the tested competency.
Ulcerative Conditions
Recurrent aphthous stomatitis (RAS)
| Type | Size and course | Management |
|---|---|---|
| Minor (~80%) | Under 1 cm, heals in 7–14 days without scarring | Topical corticosteroid (triamcinolone in Orabase, fluocinonide gel), topical anesthetic, avoid sodium lauryl sulfate dentifrice |
| Major | Over 1 cm, deep, 2–6 weeks, heals with scarring | Potent topical or intralesional corticosteroid; systemic therapy in severe cases |
| Herpetiform | Crops of 10–100 pinpoint ulcers that coalesce | Topical corticosteroid; tetracycline rinse |
Location is the diagnostic key: aphthae occur only on non-keratinized, movable mucosa — buccal and labial mucosa, ventral tongue, floor of mouth, soft palate. Investigate for underlying causes when ulcers are severe, unusually frequent, or new in adulthood: iron, folate, and vitamin B12 deficiency; celiac disease; Crohn disease; HIV; Behcet syndrome (oral plus genital ulcers plus uveitis); and cyclic neutropenia.
Recurrent intraoral herpes simplex
Recurrent HSV lesions appear on keratinized mucosa bound to bone — hard palate and attached gingiva — as clustered vesicles that rupture into a coalescing ulcer. This location rule is the single most reliable discriminator from aphthae. Primary herpetic gingivostomatitis in a child presents with fever, malaise, cervical lymphadenopathy, and diffuse painful gingivitis with ulcers on both keratinized and non-keratinized surfaces; management is supportive — hydration, analgesia, and antivirals within the first 72 hours.
Herpes labialis is preceded by a prodrome of tingling; topical or systemic antivirals are effective only if started in the prodrome. Treating an active vesicular lesion with elective dental care risks autoinoculation and herpetic whitlow in the clinician; defer elective care.
Vesiculobullous Diseases
| Disease | Level of separation | Clinical picture | Immunofluorescence | Management |
|---|---|---|---|---|
| Pemphigus vulgaris | Intraepithelial (suprabasilar) acantholysis — "row of tombstones" | Flaccid bullae rupture quickly; oral lesions often the first sign; positive Nikolsky sign; painful widespread erosions | Direct IF: intercellular "chicken-wire" IgG against desmoglein 3 | Urgent referral — systemic corticosteroids and steroid-sparing immunosuppressants; historically fatal untreated |
| Mucous membrane (cicatricial) pemphigoid | Subepithelial — full-thickness epithelial separation | Desquamative gingivitis is the classic oral presentation; tense bullae; ocular scarring (symblepharon) can cause blindness | Direct IF: linear IgG and C3 at the basement membrane | Topical then systemic corticosteroids; mandatory ophthalmology referral |
| Erosive lichen planus | Basal cell degeneration with band-like lymphocytic infiltrate | Bilateral, symmetric reticular Wickham striae with erosive areas; buccal mucosa most common | Direct IF: shaggy fibrinogen at the basement membrane | Topical corticosteroids; long-term monitoring for the small but real risk of malignant transformation |
| Erythema multiforme | Subepithelial with epithelial necrosis | Acute onset; hemorrhagic crusted lips; target lesions on skin; often triggered by HSV or medications | — | Withdraw trigger, supportive care, corticosteroids in severe cases; Stevens-Johnson and toxic epidermal necrolysis require hospitalization |
Desquamative gingivitis is a clinical description, not a diagnosis. Its differential is mucous membrane pemphigoid, erosive lichen planus, and pemphigus vulgaris, and it is resolved by biopsy with a perilesional specimen submitted for both routine histology and direct immunofluorescence — a detail the examination tests.
Fungal Infections
| Presentation | Features | Treatment |
|---|---|---|
| Pseudomembranous candidiasis (thrush) | White curd-like plaques that wipe off leaving erythema | Topical: nystatin suspension or clotrimazole troches; systemic fluconazole for extensive or refractory disease |
| Erythematous (atrophic) candidiasis | Red, painful mucosa; central papillary atrophy of the dorsal tongue; common after antibiotics or with inhaled steroids | Topical antifungals; instruct steroid-inhaler users to rinse after use |
| Denture stomatitis | Erythema confined to the denture-bearing area; usually asymptomatic | Antifungal plus denture hygiene and overnight removal; disinfect or reline the prosthesis |
| Angular cheilitis | Fissured, erythematous commissures | Mixed Candida and Staphylococcus — treat with a combination antifungal/antibacterial or antifungal plus barrier; correct the cause: reduced vertical dimension, drooling, iron or B12 deficiency |
| Median rhomboid glossitis | Well-demarcated depapillated rhomboid area anterior to the circumvallate papillae | Antifungal; reassure |
Always ask why a patient has candidiasis. New or recurrent candidiasis in an adult without dentures, inhaled steroids, or recent antibiotics warrants evaluation for diabetes, immunosuppression, HIV, or malignancy.
Osseous Diseases of the Jaws
| Condition | Diagnostic features | Management |
|---|---|---|
| Medication-related osteonecrosis of the jaw (MRONJ) | Exposed bone, or bone probed through a fistula, persisting more than 8 weeks, in a patient with current or prior antiresorptive or antiangiogenic therapy and no history of head and neck radiation | Stage-based: stage 0 medical management; stage 1 antimicrobial rinse and monitoring; stage 2 antibiotics, rinse, debridement; stage 3 surgical resection. Prevention through pre-treatment dental clearance is the primary strategy |
| Osteoradionecrosis | Exposed necrotic bone in a previously irradiated field, typically posterior mandible, after doses above roughly 50–60 Gy | Conservative debridement, antibiotics, atraumatic technique; hyperbaric oxygen is adjunctive and its role is debated; prevention by pre-radiation extraction |
| Osteomyelitis | Deep pain, swelling, fever, paresthesia; moth-eaten radiolucency with sequestra; usually mandible | Culture-directed antibiotics, drainage, sequestrectomy, treat the odontogenic source |
| Fibrous dysplasia | Painless unilateral expansion; ground-glass trabeculation blending imperceptibly into normal bone | Observe; recontour only after growth stabilizes; do not resect |
| Cemento-osseous dysplasia | Vital teeth; periapical, focal, or florid; radiolucent to radiopaque over time | No treatment; avoid biopsy and elective surgery in the affected bone, which heals poorly |
| Paget disease of bone | Progressive maxillary enlargement, dentures becoming tight, cotton-wool opacities, elevated alkaline phosphatase | Medical management with bisphosphonates; extractions carry bleeding and healing risk |
| Central giant cell granuloma | Anterior mandible, may cross midline, multilocular | Curettage, intralesional corticosteroid; exclude hyperparathyroidism by checking calcium, phosphorus, alkaline phosphatase, and PTH |
Potentially Malignant Disorders
| Disorder | Malignant transformation risk | Management |
|---|---|---|
| Leukoplakia | Low overall; higher when non-homogeneous, on the floor of mouth or ventrolateral tongue, or in a non-smoker | Biopsy; remove the cause; excise dysplastic lesions; monitor |
| Erythroplakia | Highest of the group — a large proportion show severe dysplasia or carcinoma at biopsy | Prompt biopsy |
| Proliferative verrucous leukoplakia | High, multifocal, poor prognosis | Aggressive surveillance and excision |
| Oral submucous fibrosis | Significant; associated with areca (betel) nut chewing | Cessation, physiotherapy, monitoring |
| Actinic cheilitis | Lower lip, chronic sun exposure | Sun protection, vermilionectomy or laser ablation for dysplasia |
Management rule that reliably scores: a lesion that persists more than two weeks after removal of a suspected cause is biopsied, and any erythroplakic component is biopsied promptly. Empiric treatment without a diagnosis is the wrong answer whenever biopsy is an available option.
A 55-year-old presents with painful erosions of the buccal mucosa and gingiva. Gentle lateral pressure on clinically normal mucosa produces a bulla. Biopsy shows intraepithelial separation above the basal cell layer with acantholytic cells, and direct immunofluorescence shows intercellular IgG in a chicken-wire pattern. What is the diagnosis and the appropriate action?
A patient has a cluster of small ulcers on the hard palate that began as vesicles. Which feature most strongly supports recurrent intraoral herpes simplex rather than recurrent aphthous stomatitis?
A patient taking oral alendronate for eight years presents with 1 cm of exposed necrotic bone in the posterior mandible that has persisted for three months following an extraction. There is no history of head and neck radiation, and there is localized infection. What is the most appropriate management?
A 70-year-old denture wearer has fissured, erythematous lesions at both commissures. Which management plan is most complete?