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Emergency and Acute Medicine – Necrotizing Ulcerative Gingivitis
Necrotizing ulcerative gingivitis (NUG) is an acute periodontal disease characterized by painful ulceration and necrosis of the gingival papillae, producing the classic “punched-out” appearance. It is also known as acute necrotizing ulcerative gingivitis, trench mouth, Vincent disease, or fusospirochetal gingivitis. The condition is not contagious and most commonly affects children and young adults, particularly in developing regions such as sub-Saharan Africa. In developed countries it is rare and is typically seen in severely immunocompromised individuals. Males are affected more often than females. If untreated, NUG can progress to more severe disease, including necrotizing stomatitis, necrotizing ulcerative periodontitis with alveolar bone involvement, or orofacial gangrene (noma).
The disease is caused by an overgrowth of normal oral flora, most notably Prevotella intermedia and spirochetes. While predisposing factors are not required for diagnosis, they are commonly present and include poor oral hygiene, gingivitis, malnutrition, smoking, emotional or physical stress, and immunodeficiency states such as HIV infection or other causes of immunosuppression. There is also a possible association with direct exposure to certain chemicals, including recreational drugs such as MDMA (ecstasy).
Clinically, NUG presents with acute onset of severe oral pain and bleeding gums that may occur spontaneously or with minimal manipulation. The hallmark finding on physical examination is loss of the interdental papillae, resulting in crater-like, “punched-out” ulcers that bleed easily. Necrotic debris often overlies the ulcerated areas, forming a grayish pseudomembrane that, when removed, reveals a bleeding surface. Patients frequently complain of foul breath and may have associated low-grade fever, malaise, and submandibular lymphadenopathy.
The diagnosis of necrotizing ulcerative gingivitis is primarily clinical, as laboratory tests and imaging studies are generally not helpful. Evaluation should focus on identifying underlying systemic disease, particularly immunosuppression, neutropenia, or HIV infection. It is also essential to assess for complications such as extension of lesions into the periodontal ligament and alveolar bone, progression to necrotizing stomatitis, or development of orofacial gangrene, which carries a high mortality rate if untreated.
Initial management focuses on supportive care and symptom relief. Dehydrated patients may require intravenous fluids. Pain control is achieved with topical agents such as viscous lidocaine and systemic analgesics, with narcotics rarely required. Gentle debridement of the pseudomembrane using gauze or a cotton-tipped applicator soaked in diluted hydrogen peroxide helps reduce bacterial load and improve healing. Antibiotic therapy is indicated in patients with fever, lymphadenopathy, or systemic symptoms, and in those who are immunocompromised. Common regimens include penicillin with metronidazole or clindamycin as an alternative.
Outpatient therapy is central to recovery and includes chlorhexidine gluconate mouth rinses, diluted hydrogen peroxide rinses, avoidance of oral irritants such as spicy foods and hot beverages, and reinforcement of good oral hygiene with gentle brushing and flossing. Nonsteroidal anti-inflammatory drugs or acetaminophen are usually sufficient for pain control. More extensive antimicrobial coverage, including antifungal or antiviral therapy, may be required in severely immunosuppressed patients.
Hospital admission is reserved for patients with extensive disease, significant systemic symptoms, severe dehydration with inability to tolerate oral intake, or evidence of progression to orofacial gangrene. Most patients who can maintain hydration and have no signs of advanced disease may be safely discharged with close follow-up. All patients require urgent referral to a dentist or periodontist for definitive care, including deep scaling and debridement.
Key clinical pearls include maintaining a high index of suspicion for underlying immunosuppression, particularly HIV infection, and recognizing that necrotizing ulcerative gingivitis can progress rapidly if left untreated. Early identification and prompt intervention are essential to prevent serious and potentially life-threatening complications.
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