11.2 Acute Management of Avulsed, Luxated & Fractured Permanent Teeth

11.2 Acute Management of Avulsed, Luxated & Fractured Permanent Teeth

Traumatic dental injuries (TDIs) present complex clinical challenges requiring rapid assessment, precise emergency intervention, and strict adherence to evidence-based protocols. For the ADC Written Examination, candidates must demonstrate mastery of the International Association of Dental Traumatology (IADT 2020 Guidelines) as applied within Australian clinical practice, focusing on root development stage (open vs. closed apex), extra-oral dry time, storage media, splinting dynamics, and endodontic timing.

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1. Emergency Assessment & Triage

Initial presentation requires ruling out severe head injury, facial fractures, or airway compromise:

• Neurological Screen: Assess loss of consciousness, nausea/vomiting, retro-amnesia, orientation, and cranial nerve function.
• Soft Tissue Inspection: Examine for embedded tooth fragments or foreign bodies in lips, cheeks, or tongue. Radiographs of soft tissue wounds are indicated if tooth fragments are missing.
• Tetanus Prophylaxis: Verify tetanus immunization status. If the wound is contaminated with soil/dirt and the last booster was > 5 years ago (or > 10 years for clean wounds), refer immediately for medical booster administration.

Critical Note: Primary teeth should NEVER be re-implanted following avulsion due to the high risk of mechanical trauma and infection damaging the underlying permanent tooth germ.

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2. Emergency Management of Permanent Tooth Avulsion

Avulsion represents complete displacement of the tooth out of its alveolar socket. Prognosis depends directly on the survival of periodontal ligament (PDL) cells remaining attached to the root surface.

A. Immediate First-Aid & Storage Media

1. Handling: Handle the tooth only by the crown. Do not touch, rub, or scrape the root surface to avoid killing delicate PDL cells.
2. Rinsing: If contaminated, gently rinse the root with cold running water, saline, or milk for maximum 10 seconds before re-implantation.
3. Optimal Storage Media (in order of preference):
   • Hank's Balanced Salt Solution (HBSS): Osmotically balanced, preserves PDL cell viability for up to 24 hours.
   • Cold Whole Milk: Maintains cell osmolarity and physiological pH for up to 6 hours.
   • Saline / Saliva: Acceptable short-term storage media (< 1-2 hours).
   • Water: STRICTLY CONTRAINDICATED. Water is hypotonic and induces rapid lysis of PDL cells.

B. Treatment Protocol Based on Extra-Oral Dry Time & Apex Maturation

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3. Splinting Dynamics & Guidelines

Modern IADT guidelines emphasize flexible (passive) splinting over rigid immobilization:

• Material: 0.3-0.4 mm stainless steel wire, orthodontic flex-wire, or 80-lb monofilament nylon line bonded to the injured tooth and one uninjured neighboring tooth on each side using composite resin.
• Physiological Rationale: Flexible splints permit micro-movement of the tooth during mastication and speech. Micro-motion stimulates functional differentiation of PDL stem cells, preventing osteoclast activation and dramatically lowering the incidence of replacement resorption (ankylosis).
• Duration:
  • Avulsion, Subluxation, Extrusive Luxation, Lateral Luxation: 2 Weeks
  • Intrusive Luxation, Alveolar Process Fracture, Root Fracture (Middle 1/3): 4 Weeks
  • Root Fracture (Cervical 1/3): 4 Months (flexible or semi-rigid splint)

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4. Luxation Injuries: Classification & Emergency Interventions

Luxation injuries involve displacement of the tooth relative to its alveolar housing, causing varying degrees of damage to the pulpal blood supply and PDL fibers.

[Concussion]      ── No displacement, non-mobile, tender to percussion. Monitor pulp.
[Subluxation]      ── Increased mobility, tender, no displacement, bleeding at gingival margin. Flexible splint 2 weeks if needed.
[Extrusive Luxation]── Partial axial displacement out of socket. Manually reposition into socket; flexible splint 2 weeks.
[Lateral Luxation]  ── Eccentric displacement (comminution of alveolar socket wall). Unlock tooth from bone; reposition; flexible splint 4 weeks.
[Intrusive Luxation] ── Apical displacement deep into alveolar bone. High risk of pulp necrosis and ankylosis.

Management of Intrusive Luxation:

1. Immature Root (Open Apex): Allow spontaneous re-eruption (spontaneous movement occurs in majority of cases due to eruptive potential). If no movement after 4 weeks, initiate orthodontic repositioning.
2. Mature Root (Closed Apex):
   • Intrusion < 3 mm: Allow spontaneous re-eruption. If no movement after 8 weeks, reposition orthodontically or surgically.
   • Intrusion 3-7 mm: Reposition orthodontically or surgically.
   • Intrusion > 7 mm: Surgical repositioning with flexible splinting for 4 weeks. Initiate endodontics within 2 weeks as pulp necrosis is universal.

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5. Crown Fractures & Pulp Preservation (Cvek Pulpotomy)

When traumatic injuries result in crown fractures exposing the dental pulp, preserving pulpal vitality is paramount—especially in young patients with immature open apices to enable continued root maturation (apexogenesis).

Cvek Partial Pulpotomy Protocol:

1. Indication: Traumatic pulp exposure following complicated crown fracture, irrespective of exposure size, provided the exposure duration is under 7-14 days and pulpal inflammation is confined to the superficial 1-2 mm.
2. Surgical Technique: Isolate tooth under rubber dam. Amputate the inflamed superficial 1-2 mm of pulpal tissue using a high-speed diamond bur with abundant sterile water cooling.
3. Hemostasis: Gently flush the wound with 1-5% NaOCl for 2-3 minutes. Hemostasis must be achieved naturally within 5 minutes. Persistent bleeding indicates deeper pulpal inflammation requiring deeper pulpotomy or pulpectomy.
4. Bioactive Capping: Place Mineral Trioxide Aggregate (MTA) or Biodentine directly over the pulpal stump (minimum 2 mm thickness).
5. Coronal Restoration: Cover with glass ionomer cement and restore the crown with composite resin to establish an immediate bacterial-tight seal.

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