Dental Avulsion: Emergency Management and Clinical Care

Introduction to Dental Avulsion – Emergency Management and Clinical Care

Understanding Dental Avulsion

Dental avulsion, also known as exarticulation or total luxation, is defined as the complete dislocation of a tooth entirely out of its socket.

Etiology (Causes) of Tooth Avulsion:

Dental avulsion most commonly results from traumatic incidents such as:

● Fights

● Falls

● Sports injuries

These injuries are frequently observed in various environments, including:

● Home

● School

● Sports centers

Certain anatomical features can significantly increase an individual's predisposition to dental avulsion:

● Protuberant upper teeth: Often a characteristic of Class II division I malocclusion

● Incompetent lips

● Mouth breathing

● Overjet exceeding 3 mm

● Anterior open bite

Investigation – Radiographic Examination

Radiographs are an essential tool for investigating suspected dental avulsion:

● They typically reveal an empty socket where the tooth once resided.

● Radiographs can also help identify any associated bone fractures that may have occurred during the trauma.

● If the avulsed tooth is not immediately found, a radiographic examination is indicated to locate it, as it might have been displaced into surrounding tissues.

● In cases of recent trauma, the lamina dura, which is the thin radiopaque line lining the tooth socket, should still be visible on the radiograph.

Critical Prognostic Factors:

The ultimate goal in the management of dental avulsion is to achieve the best possible outcome for the avulsed tooth. Several critical factors heavily influence the prognosis and successful healing:

● Extraoral dry time: The duration the tooth remains outside the mouth and not in a suitable storage medium.

● Storage medium: The solution in which the tooth is kept if immediate replantation is not possible.

● Apex status: Whether the tooth's apex is open (immature tooth) or closed (mature tooth), which impacts its revascularization potential.

● Time to reimplantation: How quickly the tooth is reinserted into its socket.

● Handling of the tooth: Proper handling to minimize trauma to the root surface and periodontal ligament cells.

● Patient’s general health: Can influence the overall healing process.

Dental Avulsion – Management at the Site of Injury and Storage Media

Guidelines and Immediate Management

This module focuses on the crucial immediate steps for managing an avulsed permanent tooth, aligning with the International Association of Dental Traumatology (IADT) 2020 guidelines.

Management – Replantation:

The primary management at the site of injury for an avulsed permanent tooth is immediate replantation.

When NOT to Replant?

Replantation of an avulsed tooth is contraindicated in specific situations, including:

● Presence of periodontal disease
● Severe caries in the avulsed tooth
● An uncooperative patient
● Certain medical conditions in the patient, such as immunosuppression or cardiac conditions

Trauma Phone Call & Assessment at the Site of Injury:

Effective management often begins with a trauma phone call to assess the avulsed tooth and provide initial guidance at the injury site.

The speed of replantation is a critical determinant of the prognosis:

● Immediate replantation leads to successful periodontal ligament (PDL) healing in approximately 85% of cases.
● If the tooth is replanted within 5 minutes of avulsion, the PDL cells are likely to maintain their normal function.
● After more than 15 minutes of dry storage, stem cells are no longer able to differentiate.
● After 30 minutes of dry storage, all PDL cells become necrotic.

Storage Medium for Avulsed Teeth:

When immediate replantation is not feasible, the avulsed tooth must be stored in an appropriate transport medium.

Characteristics of an Ideal Storage Medium:

An ideal storage medium should possess several key characteristics:

● Have antimicrobial properties.

● Be capable of maintaining the viability of periodontal fibers for an acceptable period15.

● Have the same osmolarity as body fluids.

● Not produce any antigen-antibody reactions.

● Reduce the risk of post-reimplantation root resorption or ankylosis.

● Have a good shelf-life.

● Be effective in various climates and under different conditions.

● Wash off extraneous materials and toxic waste products.

● Aid in the reconstitution of depleted cellular metabolites.

Various Storage Media:

A range of storage media have been identified or investigated for avulsed teeth:

● Milk
Saline
Oral Rehydration Solution (ORS)
Hank's Balanced Salt Solution (HBSS)
Egg white
Water
Coconut water
Green tea
Aloe vera gel
Soy milk
Emdogain

Gatorade

Contact lens solution

Viaspan

Rice water
Key Storage Media Details:

● Hank's Balanced Salt Solution (HBSS):

○ Considered the "gold standard" for storing avulsed teeth.

○ A sterile, physiologically balanced isotonic salt solution that can maintain the vitality of PDL cells for up to 48 hours.

○ Biocompatible with PDL cells.

○ pH balanced at 7.2

○ Osmolality of 320 mOsm/kg.

○ The American Association of Endodontists (AAE) specifically recommends Hank’s balanced salt solution.

● Milk:

○ Considered the second or third best transportation medium.

○ Has a physiological pH (6.5-7.2).

○ Able to preserve the viability of PDL cells.

○ Has a low bacterial count and is commonly available.

○ Contains growth factors and essential nutrients for cells.

○ Can maintain viability, mitogenicity, and clonogenic capacity of PDL cells for up to 24 hours.

○ Supports the proliferation and regeneration of epithelial cell rests of Malassez.

● Coconut Water:

○ Biologically pure and sterile.

○ Rich in amino acids, minerals, and vitamins

○ Possesses regenerative and antioxidant properties.

○ Its superior osmolarity, easy availability, and cost-effectiveness make it a more satisfactory option than milk and saline for maintaining PDL viability.

● Human Saliva:

○ not an ideal storage medium for avulsed teeth.

○ Its low osmolality (60-70 mOsm/kg) can cause swelling and membrane damage to PDL cells if teeth are stored in it for 2 to 3 hours.

The presence of microorganisms increases the possibility of infection post-reimplantation.

Dental Avulsion – Management at the Dental Office - Clinical Replantation Protoco

This module outlines the comprehensive clinical management protocol for avulsed teeth at the dental office, covering replantation procedures and splinting techniques.

I. At the Clinic: Initial Assessment

Upon a patient's arrival at the dental office with an avulsed tooth, a thorough initial assessment is crucial. This includes:

Case history: Gathering detailed information about the injury, including how, when, and where it occurred.
Assessment of time interval: Determining the total extraoral dry time since the avulsion occurred. This is a critical prognostic factor.
Information on storage medium used: Ascertaining what the tooth was stored in (e.g., milk, saline, or if it was dry). This significantly impacts PDL cell viability.
Examination for contamination: Visually inspecting both the avulsed tooth and the tooth socket for any signs of debris, foreign material, or gross contamination.
Examination of alveolus: A careful inspection of the tooth socket to check for any integrity issues or fractures.
Investigations: If a fracture of the socket wall is suspected, further investigations, such as radiographic examinations, are necessary to confirm and assess the extent of the fracture.

II. Replantation Protocol: Based on PDL Cell Viability

The specific replantation protocol is determined by the viability of the periodontal ligament (PDL) cells, which is directly linked to the extraoral dry time and the storage conditions of the tooth.

● Tooth replanted before patient's arrival at the clinic. In these ideal situations, the PDL cells are considered viable, and the prognosis is generally favorable.

● Tooth kept in a physiological storage medium or stored dry, with an extraoral dry time less than 60 minutes. In these cases, the PDL cells may still be viable, warranting a specific replantation approach aimed at preserving them.

● Dry time longer than 60 minutes or other reasons suggesting non-viable cells. When the dry time exceeds 60 minutes, or other factors indicate compromised PDL cell viability, a modified protocol is followed, often focusing on preventing ankylosis.

● General Replantation Steps (for potentially viable PDL cells):

Tooth placed in saline: Before handling or replantation, the tooth should be immersed in sterile saline.

Root surface rinsed with saline: Gently rinse the entire root surface with saline to remove any superficial debris without scrubbing or touching the root.

Socket examined for fracture: Re-examine the tooth socket to ensure no new fractures have occurred or to confirm initial findings.
Check for gingival lacerations and if suturing is needed: Any soft tissue injuries, such as gingival lacerations, should be carefully assessed and sutured if necessary to facilitate healing and provide a good seal around the replanted tooth.
Tooth replanted using digital pressure: Gently guide the tooth back into its original socket using light digital pressure. Avoid forceful insertion.
The replanted incisor should fit loosely in the alveolus

Replanted teeth should be splinted for a minimal period: Once repositioned, the tooth must be stabilized to allow healing.

III. Stabilization of Replanted Teeth (Splinting)

Splinting is a critical step for successful healing of avulsed teeth.

● Purpose: Stabilization is necessary to maintain the replanted tooth in its correct anatomical position and to provide patient comfort and improve function during the healing phase.

● Optimal Splinting Characteristics: Splints should be short-term, passive, and flexible.

○ Teeth should generally be stabilized for a minimum period of 2 weeks.

○ The splint should allow for good oral hygiene to prevent plaque accumulation and secondary infections, and it must be well-tolerated by the patient.

○ If endodontic treatment is indicated (which is often the case for mature avulsed teeth), it should be carried out prior to splint removal.

○ Tetanus prophylaxis is important: As most avulsed teeth may have contacted soil, or the wound itself is soil-contaminated, tetanus prophylaxis should be considered and administered if indicated.

Classification of Splints by Mobility:

● Flexible: Allows for more mobility than a non-injured tooth, promoting physiological movement for PDL healing.

● Semi-rigid: The mobility of the splinted tooth is equal to that of a normal, non-injured tooth.

● Rigid: Allows for less than normal tooth mobility, which is generally discouraged for PDL healing as it can promote ankylosis.

Types of Splints Commonly Used:

● Composite and wire splints

● Composite and fishing line splints

● Orthodontic wire and bracket splints

● Fiber splints

● Titanium trauma splints (TTS)

• Interlig

"Avulsion - Replantation Protocol," outlines the comprehensive clinical guidelines for managing avulsed teeth, with specific attention to root maturity and the viability of periodontal ligament (PDL) cells.

The initial assessment at the clinic is critical, involving a detailed case history, evaluation of the extraoral time, identification of the storage medium used, and examination for contamination and alveolar fractures. The replantation protocol itself is tailored based on PDL cell viability, differentiating between teeth replanted immediately or within a very short time (most likely viable PDL cells), those kept in a physiological medium for less than 60 minutes (potentially viable but compromised PDL cells), and those with a dry time exceeding 60 minutes (likely non-viable PDL cells). General replantation steps, applicable to potentially viable cells, include placing the tooth in saline, rinsing the root surface, examining the socket for fractures, checking for and suturing gingival lacerations, replanting with digital pressure, ensuring a loose fit in the alveolus, and finally, splinting the tooth for a minimal period.

Importance of detailed follow-up schedule extending up to 5 years, including periodic pulp vitality testing and clinical and radiographic examinations has been explained. The module also provides guidance on when to perform root canal treatment (RCT), ideally 7-10 days post-replantation, or even prior to replantation for dry times over 60 minutes, and advises waiting for signs of necrosis in open apex cases. The prognosis for avulsed teeth is defined by favorable outcomes (asymptomatic, normal mobility, no resorption) and unfavorable outcomes (symptomatic, excessive mobility, radiographic resorption).

This module covers avulsion in primary dentition and the field of sports dentistry. It begins by discussing the potential effects of avulsion in primary teeth on the developing permanent dentition, including enamel discoloration, crown dilacerations, odontoma-like malformations, root duplication, lateral root angulation or dilacerations, partial or complete arrest of root formation, sequestration of permanent tooth germs, and disturbances in eruption. Themodule then introduces sports dentistry as a specialized branch closely related to dental traumatology, focusing on the prevention and treatment of sports-related dental and orofacial injuries, as well as information dissemination and research on preventive procedures. Common sports-related dental injuries are detailed, including frequent soft tissue injuries like abrasions and lacerations (especially over bony prominences and lips), which require evaluation to rule out underlying fractures. It also addresses fractures, noting the zygoma and mandible as the most frequent sites of bony injury, often resulting from direct blunt trauma and also highlights the condyle as the most vulnerable part of the mandible, with fractures in this area potentially leading to long-term facial deformity, and emphasizes airway management as the most critical immediate care aspect for mandibular fractures. Finally, it discusses the prevention of orofacial injuries through protective devices categorized as extraoral (helmets, facemasks) and intraoral (mouthguards), which can be used individually or in combination. The module concludes by summarizing that tooth avulsion is a true dental emergency where timely and knowledgeable intervention, from on-site management and proper storage to replantation and splinting, is vital for preserving the tooth and its structures, and that successful management also requires long-term follow-up, monitoring for complications, and patient education.