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MTA Apexification

Single-visit apical barrier formation in immature permanent teeth with open apex and necrotic pulp using mineral trioxide aggregate (MTA), replacing traditional multi-visit calcium hydroxide apexification (Frank technique 6-24 months) with predictable apical seal in 1-2 visits.

Written by: Saygı Hospital Health Guide Editorial Board
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This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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What is MTA Apexification?

MTA apexification is the placement of mineral trioxide aggregate apical plug (4-5 mm thick) at the open apex of immature permanent teeth with necrotic pulp to create an artificial apical barrier, eliminating the prolonged calcium hydroxide treatment (Frank technique, requires monthly Ca(OH)2 changes for 6-24 months until apical bridge forms by mineralization). Introduced by Torabinejad in 1993 (originally for retrograde fillings in apicectomy), MTA was applied to apexification by Witherspoon and Ham in 2001 with successful single-visit protocols.

Indications: traumatic dental injury (horizontal root fracture, intrusive luxation) in immature permanent teeth (open apex, age 7-15 typically), pulp necrosis from carious lesion in immature tooth, internal root resorption with perforation, apexification preparing for orthograde obturation; teeth with complete root development do not need apexification (standard root canal). Composition: ProRoot MTA white (Dentsply Sirona) — Portland cement, bismuth oxide, calcium sulfate; MTA Angelus white — similar composition, faster setting time; Bioceramic alternatives — Biodentine (Septodont, fast-setting calcium silicate), Endosequence BC root repair material.

Mechanism of action: MTA hydrates with water releasing calcium hydroxide (alkaline pH 12.5 antimicrobial), tricalcium aluminate, and calcium silicate hydrate; bioactive — induces hard tissue formation (osteodentin, cementum-like tissue) at apex (cementogenesis), recruits stem cells from periodontal ligament (HERS — Hertwig epithelial root sheath), excellent sealing ability (microleakage < gutta-percha + sealer), biocompatible (no inflammation, no toxicity), radiopaque (visible on X-ray for verification). Modern alternatives: Biodentine (faster setting 12 minutes vs 4 hours, better handling), bioceramic putty (NeoMTA Plus).

Symptoms

Pulp necrosis in immature permanent tooth (open apex, divergent canal walls) — usually traumatic etiology
Avulsion injury with delayed replantation and pulp necrosis
Intrusive luxation injury with subsequent pulp necrosis
Caries-induced pulp necrosis in young permanent tooth
Failure of conventional root canal treatment with persistent apical lesion in immature tooth
Internal root resorption with perforation
Periapical lesion in immature tooth with open apex
Pre-orthodontic treatment (apex closure required before tooth movement)

Risk Factors

Vertical root fracture risk in long-term Ca(OH)2 treated teeth (8-12 month exposure weakens dentin) — MTA apexification reduces this risk
Operator unfamiliarity with MTA placement (requires gentle compaction with pluggers, paper points)
Coronal microleakage allowing reinfection (mandatory immediate post-MTA composite or temporary seal)
Persistent periapical infection despite apexification (5-10 percent failure)
Tooth fracture during follow-up (insufficient root development, brittle dentin)
Discoloration with MTA white (mild gray-brown stain) — Biodentine alternative for esthetic anterior teeth
MTA cost (one application $50-$80, prohibitive in resource-limited settings)
Patient cooperation in young children (long appointments, mouth opening, isolation)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Trauma to permanent front tooth in child (age 7-15) with avulsion or fracture
  • Pulp necrosis confirmed by no response to vitality testing in young permanent tooth
  • Apical radiolucency in immature tooth on dental X-ray
  • Persistent fistula or sinus tract from young permanent tooth
  • Failed previous attempts at apexification with calcium hydroxide
  • Tooth scheduled for orthodontic treatment requiring apex closure
  • Routine dental check-up reveals open apex on radiograph
  • Discoloration of immature traumatized front tooth (sequela of pulp necrosis)

Treatment Methods

01
Comprehensive examination: history of trauma, pulp vitality testing (electric pulp test, cold test, thermal test — all negative in necrotic pulp), periapical and panoramic radiographs (open apex with parallel or divergent walls = immature tooth, periapical radiolucency), CBCT for complex cases (root resorption, apical lesion 3D extent)
02
Treatment planning: assess root development stage (Cvek classification stages 1-5), tooth restorability, prognosis; informed consent with patient and parent regarding multi-visit alternative (Ca(OH)2 apexification), single-visit MTA option, regenerative endodontics in newer protocols
03
First visit (cleansing): rubber dam isolation mandatory, access cavity preparation, working length determination with apex locator (Root ZX, Propex Pixi) and periapical radiograph, gentle instrumentation (avoid file binding in thin dentinal walls — use hand files only K-files #20-40 with circumferential filing, rotary contraindicated), copious irrigation with 1-2.5 percent sodium hypochlorite (lower concentration in young teeth to preserve stem cells), 17 percent EDTA for smear layer removal, intracanal calcium hydroxide dressing (Ultracal, Pulpdent) for 1-2 weeks (decontamination)
04
MTA apical plug placement (second visit): rubber dam, remove Ca(OH)2 with sodium hypochlorite irrigation, dry canal with paper points; mix MTA powder with sterile water (3:1 ratio) to putty consistency on glass slab; transport MTA to apical area with messing gun (carrier), Dovgan applicator, or amalgam carrier; gently compact with hand pluggers (root canal pluggers RCP, Schilder pluggers) to form 4-5 mm apical plug; verify radiographically; place wet cotton pellet over MTA in canal and temporary seal (Cavit) for 24 hours setting (Biodentine sets in 12 minutes — single visit possible)
05
Definitive obturation (third visit if MTA, single visit if Biodentine): remove temporary seal, verify MTA set by tactile sensation (hard); fill remaining canal with thermoplastic gutta-percha (warm vertical condensation Schilder, single cone with bioceramic sealer); place fiber post in cervical 1/3 if structural reinforcement needed; permanent coronal restoration (composite resin, ceramic onlay, or full-coverage crown if extensive coronal damage)
06
Post-treatment care: instruct patient on oral hygiene, avoid biting hard foods on treated tooth (fracture risk), follow-up appointments at 1 month, 3 months, 6 months, 12 months, then annually; clinical and radiographic assessment for periapical healing (radiographic evidence of healing within 6-12 months), tooth discoloration (rare with white MTA), root development resumption (in younger patients, some cases show continued root growth — root maturation)
07
Long-term prognosis: success rate 81-94 percent (clinical and radiographic healing), reduced cervical fracture risk compared to Ca(OH)2 apexification (which has 28-77 percent fracture risk after 1 year exposure), durable apical seal, restored function and esthetics; failure causes include reinfection from coronal leakage, persistent extraradicular infection, vertical root fracture, perforation; alternative regenerative endodontic procedures (REP — revascularization with platelet-rich fibrin or blood clot scaffold) gaining popularity for younger patients with thin walls

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