Traumatic Dental Injuries in Children
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Direct answer
Trauma management in children is decided first by dentition: an avulsed primary tooth is never replanted because replantation endangers the developing successor, whereas an avulsed permanent tooth with a closed apex should be replanted immediately — at the accident site if possible — after rinsing the root clean, then splinted flexibly for about two weeks with root canal treatment started within a fortnight. Crown fractures range from enamel-only (smooth and observe) through enamel-dentine (bonded composite) to pulp-exposing (Cvek partial pulpotomy in a young tooth, root canal treatment in a mature necrotic one), and luxation injuries run from concussion through extrusion, lateral luxation and intrusion to avulsion. The long-term threats are the resorptions — infection-related inflammatory resorption and ankylosis-related replacement resorption — so every traumatised tooth is reviewed radiographically for years.
What you must remember
- Classify by Andreasen/WHO (concussion, subluxation, extrusive, lateral and intrusive luxation, avulsion; crown and root fractures) rather than the older Ellis scheme, though exams still quote Ellis Class I–III.
- Uncomplicated crown fracture (enamel ± dentine): etch, bond, build composite; a fragment kept in milk can be reattached. A complicated fracture in a vital, immature tooth gets a Cvek (partial) pulpotomy with calcium hydroxide or MTA; a mature necrotic tooth gets root canal treatment.
- Avulsed permanent tooth: hold by the crown, rinse the root briefly with saline, replant immediately, or transport in Hank's balanced salt solution, milk or saline — never water, never scrubbed.
- Extraoral dry time over 60 minutes means a dead periodontal ligament: delayed replantation is still attempted, but ankylosis and replacement resorption are expected.
- After replantation: flexible splint for about two weeks, root canal treatment within 7–14 days for closed apices (calcium hydroxide dressing first), amoxicillin systemically (tetracyclines avoided in children), tetanus checked, soft diet.
- Immature open-apex teeth replanted within an hour may revascularise, so endodontics begins only if that fails — the opposite of the closed-apex strategy.
- Intruded primary teeth usually re-erupt over months, but extraction is indicated if the tooth is driven toward the permanent follicle; root-fractured permanent teeth splint nearer four weeks.
- Sequelae to monitor: pulp canal obliteration (common in immature teeth, usually harmless), inflammatory external resorption, replacement resorption with ankylosis and infraposition in a growing child, and damage to successors of injured primary teeth; prevention is the custom-made mouthguard.
An avulsed incisor at the school gate
A 9-year-old arrives forty minutes after a fall, with her upper left central incisor in a flask of milk supplied by a teacher who remembered the drill. The socket is intact, no alveolar fracture, no loss of consciousness. The root is rinsed with saline — never scrubbed — and replanted with steady finger pressure. The apex is closed on the film, so the plan is root canal treatment within a fortnight, calcium hydroxide dressing first, obturation later. A flexible splint spans the adjacent teeth for two weeks — rigid fixation is a mistake, because physiologic movement protects the periodontal ligament from ankylosis. Amoxicillin, a tetanus check, soft diet, and radiographic review for resorption continues for years.
Every counterfactual carries a mark. A tooth kept dry for two hours has a non-viable periodontal ligament and a prognosis dropping to a deliberately ankylosed tooth maintained until growth completes. A 4-year-old with an avulsed primary incisor gets no replantation at all — only a follicle radiograph and follow-up. An intruded immature incisor is best watched for spontaneous re-eruption. The discipline lies in reading age, apex, extraoral time and displacement type before touching the tooth.
Where marks are lost
Practical errors dominate: scrubbing the root "to clean it", transporting the tooth in cotton or water, or splinting avulsion cases for six weeks as though it were a jaw fracture — each wrong by current guidance and each a favourite single-best-answer. The primary-versus-permanent trap is absolute: replanting an avulsed primary incisor risks the successor. Applied questions pair luxation type with management (extrusion — reposition and splint two weeks; intrusion in the young — observe; lateral luxation — reposition under anaesthesia and splint). Forgetting follow-up loses the long half of the marks: inflammatory versus replacement resorption, their radiographic looks, and why an ankylosed incisor in a growing child submerges.
Frequently asked questions
Should an avulsed primary tooth be replanted?
No — replantation risks injuring the developing permanent successor through displacement and infection; management is assessment, a follicle radiograph and follow-up.
What storage media keep an avulsed permanent tooth viable?
Hank's balanced salt solution is best; milk, saline and saliva are acceptable; water is the worst common choice because its hypotonicity destroys periodontal ligament cells.
How long is an avulsed permanent tooth splinted after replantation?
About two weeks with a flexible splint, with root canal treatment begun within 7–14 days for a closed apex; root-fracture cases stay splinted nearer four weeks.
What is the difference between inflammatory and replacement resorption?
Inflammatory resorption is infection-driven, with bowl-shaped radiolucencies on root and bone, treated by canal disinfection; replacement resorption follows ankylosis, with bone replacing root directly, a metallic percussion note and progressive infraposition.
Why can an immature replanted tooth avoid root canal treatment?
An open apex replanted promptly may revascularise, so treatment is deferred and begun only if necrosis supervenes — the reverse of the closed-apex protocol.