Dental Trauma: Emergency Management of Avulsed and Fractured Teeth

Jul 20

Introduction

Traumatic dental injuries (TDIs) represent a significant public health problem, with approximately 25% of all schoolchildren and 33% of adults having experienced some form of dental trauma, most commonly involving the maxillary central incisors. The peak incidence occurs between ages 2–4 years (falls during early ambulation) and 8–10 years (sports, playground accidents). Falls, sports injuries, bicycle accidents, motor vehicle collisions, and physical violence are the leading causes. Prompt, appropriate emergency management is the single most important determinant of tooth survival and long-term prognosis. The International Association of Dental Traumatology (IADT) publishes regularly updated evidence-based guidelines that serve as the global standard of care.

Classification of Traumatic Dental Injuries

The IADT classification system categorizes injuries based on anatomical structures affected:

Injuries to Hard Dental Tissues and Pulp

• Enamel infraction (crack): Incomplete fracture of enamel without loss of tooth structure. Visible as craze lines with transillumination.
• Enamel fracture: Complete fracture limited to enamel. No dentin exposure.
• Enamel-dentin fracture (uncomplicated crown fracture): Fracture involving enamel and dentin without pulp exposure. Dentin tubule exposure creates a pathway for bacterial ingress and requires urgent coverage.
• Enamel-dentin-pulp fracture (complicated crown fracture): Fracture involving enamel, dentin, and pulp exposure. The exposed pulp will become necrotic and infected without treatment.
• Crown-root fracture (uncomplicated/complicated): Fracture extending subgingivally. Pulp involvement may or may not be present. Fracture lines oblique to the long axis, often extending from the buccal crown margin to the palatal subgingival area.
• Root fracture: Horizontal or oblique fracture involving cementum, dentin, and pulp within the root. May be located in the cervical, middle, or apical third. The coronal fragment may be displaced.

Injuries to Periodontal Tissues

• Concussion: Injury to the tooth-supporting structures without increased mobility or displacement. Marked tenderness to percussion.
• Subluxation: Injury to supporting structures with increased mobility but no displacement. Bleeding from the gingival sulcus may be present.
• Extrusive luxation: Partial displacement of the tooth from its socket in a coronal direction (the tooth appears elongated).
• Lateral luxation: Displacement of the tooth in a non-axial direction (labial, lingual, or lateral). Often accompanied by alveolar bone fracture. Tooth is typically immobile due to bony entrapment. Percussion produces a high-pitched metallic (ankylotic) sound.
• Intrusive luxation: Displacement of the tooth apically into the alveolar bone. The tooth appears shortened or may be completely buried (complete intrusion). Often accompanied by comminution of the alveolar socket. This injury carries the highest risk of pulp necrosis and root resorption among luxation injuries.
• Avulsion (exarticulation): Complete displacement of the tooth out of its socket. This is the most severe periodontal injury and requires immediate emergency management.

Alveolar Bone Injuries

• Comminution of the alveolar socket: Crushing fracture of the socket walls, typically associated with intrusive or lateral luxation.
• Alveolar process fracture: Fracture involving the alveolar bone, which may or may not involve the tooth socket. Segmental mobility of the fracture fragment with multiple teeth moving as a unit is pathognomonic.

Emergency Management Protocols

Tooth Avulsion: The Most Time-Critical Injury

Avulsion constitutes a true dental emergency where minutes matter. The primary goal is to maintain periodontal ligament (PDL) cell viability during the extra-alveolar period. PDL cells die rapidly when desiccated—within 60 minutes of dry storage, most PDL cells become non-viable, and the prognosis for successful replantation shifts from PDL regeneration to replacement resorption (ankylosis), which will ultimately lead to tooth loss.

At the Accident Scene (First Aid Instructions)

1. Find the tooth: Handle by the crown only, never the root. PDL cells on the root surface are fragile and easily damaged by handling.
2. If contaminated: Rinse briefly (10 seconds maximum) under cold running water or saline. Do not scrub, scrape, or use disinfectants.
3. Immediate replantation (ideal): If possible at the scene, replant the tooth back into the socket immediately. Bite gently on a clean cloth or gauze to hold it in place. The patient should be transported to a dentist immediately. This is the best possible scenario with the highest success rate.
4. If replantation is not possible at the scene: Place the tooth in an appropriate storage medium immediately. The patient must be transported to a dental office within 60 minutes.

Transport Media (Best to Worst)

1. Hank's Balanced Salt Solution (HBSS): The gold standard. Commercially available as Save-A-Tooth or similar emergency kits. Preserves PDL cell viability for up to 24 hours at room temperature. HBSS has optimal pH, osmolarity, and nutrient composition for PDL cells.
2. Milk (cold, preferably low-fat): The most practical and widely available medium. Milk has physiological osmolarity and pH, contains nutrients, and is bacteriostatic. PDL cells survive up to 3–6 hours in cold milk. Skim milk is preferred over whole milk (less fat interferes with cell adhesion).
3. Saliva (buccal vestibule): Suboptimal due to bacterial contamination and non-physiological osmolarity, but better than dry storage. The tooth should be placed between the cheek and lower molars (not in young children who may swallow it).
4. Saline or water: Not recommended. Tap water is hypotonic and causes rapid PDL cell lysis. Normal saline is isotonic but lacks essential nutrients for cell survival. Only use when absolutely no other option is available.

In-Office Emergency Management

1. History and assessment: Document the time of avulsion, storage medium, and extra-alveolar dry time. This determines treatment approach. Perform clinical and radiographic examination of both the avulsed tooth and the socket. Rule out alveolar bone fracture.
2. PDL management: Do not scrape, curette, or dry the root surface. Gently remove gross debris by irrigating with saline. Soak the tooth in HBSS, saline, or doxycycline (1 mg per 20 mL saline for 5 minutes) to reduce bacterial contamination and inflammation.
3. Socket preparation: Gently irrigate the socket with saline. Do not curette the socket walls—the remaining PDL fibers on the alveolar side are important for reattachment. Remove any foreign debris or blood clot that would prevent full seating of the tooth. Verify that the socket walls are intact radiographically.
4. Replantation: Replant with gentle, steady finger pressure. Do not force. Confirm proper position clinically and radiographically. The tooth should be seated to the correct anatomical depth, verified by comparison with adjacent teeth.
5. Splinting: Apply a flexible, non-rigid splint using 0.3–0.4 mm orthodontic wire or nylon fishing line bonded to the injured tooth and two adjacent teeth on each side. Flexible splinting allows physiological tooth movement, which reduces the risk of ankylosis compared to rigid splinting.
6. Splinting duration: Avulsed teeth with extra-alveolar dry time less than 60 minutes: splint for 2 weeks. Avulsed teeth with dry time greater than 60 minutes: splint for 4 weeks. Associated alveolar fracture: splint for 4 weeks.

Post-Replantation Management

• Antibiotics: Systemic antibiotics are recommended for all replanted avulsed teeth. Doxycycline is preferred (age-appropriate: 100 mg twice daily for 7 days for patients ≥12 years; contraindicated in children under 8 years due to tooth discoloration risk). Amoxicillin or penicillin V is an alternative for younger children.
• Tetanus prophylaxis: If the tooth has been in contact with soil or the wound is contaminated, assess tetanus vaccination status and administer booster if indicated.
• Endodontic treatment: For mature permanent teeth (closed apex), pulpal revascularization is unlikely. Root canal treatment should be initiated 7–14 days after replantation, using calcium hydroxide as an intra-canal medicament before definitive obturation. This timing allows for initial PDL healing before endodontic intervention. For immature teeth (open apex), revascularization is possible (up to 30–40% success). Monitor clinically and radiographically; initiate apexification or revascularization procedures if pulp necrosis is diagnosed.
• Follow-up: Clinical and radiographic evaluation at 2 weeks, 4 weeks, 3 months, 6 months, 1 year, and then annually. Monitor for: pulp canal obliteration (partial or complete), inflammatory root resorption (radiolucent resorption lacunae with adjacent bone loss—requires immediate endodontic therapy), replacement resorption or ankylosis (loss of PDL space, replacement of root with bone—ultimately leads to tooth loss), and infraposition (especially in growing children).
• Patient instructions: Soft diet for 2 weeks, brush teeth with soft toothbrush after every meal, use 0.12% chlorhexidine mouthwash twice daily for 1 week.

Delayed Replantation (>60 Minutes Dry Time)

When the extra-alveolar dry time exceeds 60 minutes, PDL cells are non-viable. The treatment objective shifts from PDL regeneration to minimizing replacement resorption and the rate of ankylosis. Protocol modifications:

• Remove non-viable PDL remnants from the root surface by gentle gauze wiping or enzymatic debridement.
• Perform extraoral root canal treatment before replantation.
• Soak the tooth in 2% sodium fluoride solution for 20 minutes to slow resorption.
• Replant with the understanding that ankylosis and eventual tooth loss are inevitable, but the tooth may be retained for years, preserving alveolar bone for future implant placement—particularly important in growing patients.

Crown Fractures

Enamel-Dentin Fracture (Uncomplicated Crown Fracture)

Emergency management involves sealing the exposed dentin tubules to prevent bacterial ingress, reduce sensitivity, and maintain pulp vitality.

• Immediate coverage: Apply a layer of dentin bonding agent and light-cure. Alternatively, glass ionomer cement or calcium hydroxide liner can be placed. This provides a therapeutic seal until definitive restoration.
• Definitive restoration: Composite resin restoration with beveled enamel margins. Fragment reattachment using adhesive technique is the preferred option when the original tooth fragment is available and intact—it provides excellent aesthetics, preserves tooth structure, and uses enamel with identical wear characteristics. Reattachment success rates exceed 80% at 5 years with modern adhesive systems.
• Follow-up: Clinical and radiographic examination at 6–8 weeks and 1 year to verify pulp vitality.

Enamel-Dentin-Pulp Fracture (Complicated Crown Fracture)

Pulp exposure mandates immediate intervention to prevent pulp necrosis and infection.

• Vital pulp therapy:
  • Pulp capping: Indicated for small exposures (<1 mm), treated within 24 hours of injury, in teeth without signs of pulp necrosis. Apply calcium hydroxide or MTA (mineral trioxide aggregate) directly over the exposure, cover with glass ionomer, and restore definitively with composite. Success rates for MTA capping: 90–95%.
  • Partial pulpotomy (Cvek technique): Indicated for larger exposures or exposures present for >24 hours. Remove 1–2 mm of superficial pulp tissue with a sterile high-speed diamond bur under copious irrigation. Achieve hemostasis with sterile saline-moistened cotton pellet (2–3 minutes). Apply MTA or calcium hydroxide to the pulp wound, seal with glass ionomer, and restore. Success rates: 95–98% for immature teeth, 85–90% for mature teeth. This is the treatment of choice for most complicated crown fractures in young patients.
• Cervical pulpotomy or full pulpectomy: Indicated when pulp necrosis is already present, or when vital pulp therapy fails.
• Follow-up: Clinical and radiographic evaluation at 6–8 weeks, 3 months, 6 months, and 1 year. Assess for continued root development (immature teeth), pulp canal obliteration, periapical pathology, and crown discoloration.

Root Fractures

Root fractures involve cementum, dentin, and pulp. The coronal fragment may be mobile or displaced. Management depends on the fracture location and degree of displacement.

• Reduction: If the coronal fragment is displaced, reposition manually under local anesthesia. Confirm position radiographically.
• Splinting: Flexible splint for 4 weeks for cervical third fractures, 4 months for mid-root and apical third fractures. Longer splinting is required for apical fractures due to the smaller contact area and reduced mechanical stability.
• Prognosis: Favorable—approximately 75–80% of root fractures heal through interposition of connective tissue, bone and connective tissue, or calcified tissue (hard tissue union). Healing type depends on the proximity of fragments and presence of infection. The pulp in the coronal fragment may remain vital, eliminating the need for endodontic treatment in many cases.
• If pulp necrosis develops: Endodontic treatment is limited to the coronal fragment only. The apical fragment typically remains vital and does not require treatment. Attempt to negotiate the fracture line with endodontic files is contraindicated—it will damage healing tissue at the fracture site.

Luxation Injuries

Concussion and Subluxation

• Treatment: No active intervention is required for the injury itself. A flexible splint may be placed for patient comfort if the tooth is tender or mobile (subluxation), typically for up to 2 weeks. Soft diet, good oral hygiene.
• Prognosis: Generally excellent. Pulp necrosis risk is low (~5–8% for concussion, ~10–15% for subluxation).
• Follow-up: 4 weeks, 6–8 weeks, 1 year.

Extrusive Luxation

• Treatment: Reposition the tooth with gentle digital pressure under local anesthesia. Flexible splint for 2 weeks. The extruded tooth typically seats easily back into the socket.
• Prognosis: Pulp necrosis risk approaches 45–60% in mature teeth, primarily due to severance of the apical neurovascular bundle. Prophylactic root canal treatment using calcium hydroxide should be initiated 7–14 days after the injury for mature teeth with closed apices.

Lateral Luxation

• Treatment: Disengage the tooth from the bony lock by applying firm apical pressure with forceps or fingers. Reposition the tooth and alveolar bone simultaneously. Flexible splint for 4 weeks. Radiographs are essential to rule out alveolar fracture.
• Prognosis: Highest risk of pulp necrosis among luxation injuries (60–80% in mature teeth) due to severe displacement and apical vessel rupture. Endodontic treatment (calcium hydroxide) should be initiated 2–4 weeks after injury.

Intrusive Luxation

• Treatment approach depends on root development stage and degree of intrusion:
  • Immature teeth (open apex) with mild to moderate intrusion (<7 mm): Allow spontaneous re-eruption. Monitor for 4–6 weeks. If no movement within this period, initiate orthodontic extrusion.
  • Immature teeth with severe intrusion (>7 mm): Surgical or orthodontic repositioning. Spontaneous re-eruption is less likely and pulp necrosis is almost certain.
  • Mature teeth (closed apex) with intrusion <3 mm: Allow spontaneous re-eruption for 2–4 weeks. If no movement, orthodontically extrude. Pulp necrosis is inevitable—root canal treatment with calcium hydroxide should be initiated 2–4 weeks after injury.
  • Mature teeth with intrusion 3–7 mm: Orthodontic or surgical repositioning.
  • Mature teeth with intrusion >7 mm: Surgical repositioning. Suture the labial and palatal gingiva after repositioning.
• Splinting: Flexible splint for 4 weeks after surgical or orthodontic repositioning.
• Complications: Intrusive luxation carries the highest risk of pulp necrosis (>90% in mature teeth), external inflammatory root resorption, replacement resorption (ankylosis), and marginal bone loss. Intensive follow-up and proactive endodontic intervention are essential.

Prevention of Dental Trauma

• Mouthguards: Custom-fabricated mouthguards made by a dentist provide the best protection against dental trauma in contact sports. They are superior to boil-and-bite and stock mouthguards in terms of retention, comfort, protection, and patient compliance. Sports with high TDI risk: football, basketball, hockey, soccer, martial arts, skateboarding, bicycling.
• Helmets and face shields: Additional protection for sports with facial impact risk (baseball, lacrosse, hockey).
• Home safety: Childproofing sharp furniture edges, securing rugs, and using stair gates for toddlers.
• Education: Public awareness campaigns about dental first aid—particularly the importance of immediate replantation and proper storage media for avulsed teeth. Coaches, teachers, and school nurses should be trained in dental emergency management.

Conclusion

Traumatic dental injuries require prompt, systematic, and evidence-based management. The key principle across all injury types is to preserve pulp vitality and periodontal ligament viability whenever possible. Tooth avulsion demands the most urgent response—every minute of dry extra-alveolar time reduces the probability of favorable healing. Dental professionals should be prepared to provide emergency telephone guidance, manage acute injuries efficiently, and establish appropriate long-term follow-up protocols. Public education on dental first aid, combined with effective preventive measures such as mouthguards, can significantly reduce the burden of dental trauma.

References

1. Andreasen JO, Andreasen FM, Andersson L, eds. Textbook and Color Atlas of Traumatic Injuries to the Teeth. 5th ed. Wiley-Blackwell; 2019.
2. DiAngelis AJ, Andreasen JO, Ebeleseder KA, et al. International Association of Dental Traumatology guidelines for the management of traumatic dental injuries: 1. Fractures and luxations of permanent teeth. Dent Traumatol. 2012;28(1):2–12.
3. Andersson L, Andreasen JO, Day P, et al. International Association of Dental Traumatology guidelines for the management of traumatic dental injuries: 2. Avulsion of permanent teeth. Dent Traumatol. 2012;28(2):88–96.
4. Trope M. Clinical management of the avulsed tooth: present strategies and future directions. Dent Traumatol. 2002;18(1):1–11.
5. Flores MT, Andersson L, Andreasen JO, et al. Guidelines for the management of traumatic dental injuries. I. Fractures and luxations of permanent teeth. Dent Traumatol. 2007;23(2):66–71.