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Short note on localized acute alveolar osteomyelitis

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I now have all the information needed. Here is a complete short note on localized acute alveolar osteomyelitis.

Localized Acute Alveolar Osteomyelitis (Dry Socket / Alveolar Osteitis)

Definition

Localized acute alveolar osteomyelitis - more commonly known as alveolar osteitis or "dry socket" - is a localized inflammation of the alveolar bone that occurs when the blood clot normally present in the extraction socket becomes dislodged or dissolves prematurely, leaving bone exposed. It represents the most frequent painful complication following tooth extraction.
Alveolar osteitis ("dry socket") with extraction site devoid of clot
Alveolar osteitis: extraction socket devoid of clot with exposed bone - Rosen's Emergency Medicine

Pathophysiology

After a tooth extraction, a blood clot forms in the alveolar socket. This clot serves as a scaffold for healing and protects the underlying bone and nerve endings. If this clot is dislodged or fails to form, the bare alveolar bone becomes inflamed - producing intense pain from the exposed periosteum and bone marrow. It may be preceded by localized osteitis following pulpitis, which spreads through the root to the surrounding osseous tissue. If an alveolar abscess is not treated properly with antibiotics and drainage, osteomyelitis of the jaw may follow. - S. Das, Manual on Clinical Surgery, 13th Edition

Incidence

  • Occurs in 2-5% of routine extractions
  • Rises to 20-30% after removal of impacted mandibular third molars
  • More common in the lower jaw (mandible) - the maxilla is rarely affected due to its rich anastomotic blood supply from vertical arteries - Rosen's Emergency Medicine

Predisposing Factors

  1. Excessive trauma during extraction
  2. Inadequate blood supply to the extraction site
  3. Pre-existing localized infection / pericoronitis
  4. Loss of clot from sucking, straw use, rinsing, or smoking (increased negative intraoral pressure)
  5. Foreign bodies remaining in the socket
  6. Use of oral contraceptives or corticosteroids
  7. Hormone replacement therapy
  8. Periodontal disease
  9. Familial tendency - Roberts & Hedges' Clinical Procedures in Emergency Medicine; Scott-Brown's Otorhinolaryngology

Clinical Features

  • Onset: 2-5 days after tooth extraction (typically day 3-4)
  • Pain: Moderate to severe, dull, constant, and aching - localized to the extraction site and often radiating to the ear
  • Foul odor / bad taste in the mouth - in the absence of purulence or suppuration
  • Duration: Can persist for 5-40 days if untreated
  • Examination: Missing clot at the socket, exposed bare alveolar bone - NO significant surrounding edema, erythema, fluctuation, fever, leukocytosis, or lymphadenitis (which would suggest osteomyelitis)

Differential Diagnosis

FeatureAlveolar OsteitisOsteomyelitis / Infection
ClotAbsentMay be present
Swelling/erythemaAbsent or minimalPresent
PurulenceAbsentPresent
Fever/leukocytosisAbsentPresent
LymphadenopathyAbsentPresent
A dental nerve block provides instant relief in alveolar osteitis but not in osteomyelitis - this is a useful distinguishing feature. - Roberts & Hedges'

Treatment

  1. Nerve block - provides immediate pain relief; also confirms the diagnosis
  2. Irrigation - gently irrigate the socket with sterile saline to remove debris; do NOT curette the socket or remove residual clot (this exposes more bone and risks osteomyelitis)
  3. Socket packing - fill with medicated iodoform gauze impregnated with eugenol (oil of cloves) or a local anesthetic, packed to the level of the gingival cusps; change every 24-36 hours
  4. Dry Socket Paste (e.g., Sultan Healthcare) - a commercial alternative to eugenol-soaked gauze
  5. Analgesics - NSAIDs work better than narcotics for dry socket; short course of opioids (e.g., oxycodone 5 mg q4-6h) for severe pain
  6. Chlorhexidine rinses - shown to prevent alveolar osteitis; role in established disease is less clear
  7. Antibiotics - not routinely required once the socket is packed; prescribed at the discretion of the treating oral surgeon
The patient must be referred back to their dentist or oral surgeon the next day for follow-up, as socket packing must continue until healing is complete. - Roberts & Hedges'; Rosen's Emergency Medicine

Relation to Osteomyelitis of the Jaw

Alveolar osteitis represents localized alveolar bone inflammation. It can progress to true osteomyelitis if untreated. Osteomyelitis of the jaw presents in three forms:
  • (i) Acute - seen in infants post-febrile illness (measles, scarlet fever)
  • (ii) Subacute - the commonest form; follows dental infection or alveolar abscess; causes endarteritis, reduced blood supply, and bone necrosis; presents with pain, swelling, numbness of chin (inferior dental nerve compression)
  • (iii) Chronic - follows dental infection or fractures; X-ray shows local osteitis, localized abscess (like Brodie's abscess), or sequestrum formation - S. Das, Manual on Clinical Surgery, 13th Edition
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