20.2 Pediatric Pulp Therapy
Key Takeaways
- Select pulp therapy from symptoms, exposure status, hemostasis, radiographs (especially primary molar furcation), restorability, and time to exfoliation.
- Indirect pulp treatment is preferred for deep caries without exposure when the pulp is vital and radiographs are clean; seal with a durable restoration or SSC.
- Pulpotomy removes coronal pulp after vital exposure when radicular pulp is healthy and orifice bleeding is controllable; SSC restoration is standard.
- MTA/calcium silicate medicaments are preferred in contemporary primary pulpotomy teaching; formocresol is historical with toxicity concerns despite past success rates.
- Pulpectomy uses resorbable canal fills in restorable necrotic/irreversibly inflamed primary teeth; extract non-restorable or hopeless cases and plan space management.
20.2 Pediatric Pulp Therapy
Quick Answer: Choose pulp therapy by symptoms, caries depth, pulp exposure status, hemorrhage control, radiographs (furcation/roots), and restorability. Indirect pulp treatment preserves deep vital pulp without exposure; pulpotomy removes coronal pulp after vital exposure with healthy radicular pulp; pulpectomy cleans necrotic/irreversibly inflamed canal systems in restorable primaries; extract when non-restorable, hopeless furcation disease, or successor timing favors removal. Know formocresol vs MTA/bioceramic as medicaments in primary molar pulpotomy.
AFK items often present a clinical vignette (pain history, exposure type, bleeding, radiolucency) and ask for the most appropriate next treatment. Master the decision tree before memorizing brand names.
Diagnostic Framework for Primary Tooth Pulp Status
History
| Symptom pattern | Suggests |
|---|---|
| Provoked pain to sweets/cold that stops quickly | Reversible inflammation; candidate for indirect pulp or restorative only |
| Spontaneous pain, night pain, lingering pain | Irreversible pulpitis or necrosis pathway → pulpectomy or extraction (not simple IPC) |
| Swelling, sinus tract, mobility from infection | Necrosis with apical/furcal disease → pulpectomy (if restorable) or extraction |
| No symptoms but deep caries | Still radiograph and plan carefully—silent necrosis occurs |
Clinical tests (primary teeth caveats)
- Thermal/EPT less reliable in young children; cooperation limits testing.
- Percussion, palpation, mobility, soft-tissue exam remain essential.
- Compare with contralateral tooth when possible.
Radiographic red flags in primary molars
| Finding | Implication |
|---|---|
| Furcation radiolucency | Common pathosis site in primary molars (accessory canals in furcation)—pulp necrosis/infection |
| Periapical radiolucency | Infection; note proximity to permanent bud |
| Internal/external resorption | May contraindicate pulpotomy; affects prognosis |
| Physiologic root resorption | Near exfoliation → extraction often smarter than complex pulp therapy |
| Calcific degeneration / pulp stones | May complicate canal treatment |
| Deep caries into pulp horn | Plan for exposure risk |
Always assess the permanent successor follicle—avoid forcing infected material or instruments into the bud area; extraction decisions weigh damage risk vs retention benefit.
Treatment Options Overview
| Therapy | Pulp condition (concept) | Goal |
|---|---|---|
| Protective liner / stepwise / indirect pulp treatment (IPT/IPC) | Deep caries, no exposure, vital pulp, reversible symptoms or asymptomatic | Arrest caries, promote tertiary dentin, avoid exposure |
| Direct pulp cap | Small mechanical/traumatic exposure, healthy pulp (limited role in carious primary molars) | Seal exposure, maintain vitality |
| Pulpotomy | Carious/mechanical exposure, vital coronal pulp disease, radicular pulp healthy, hemostasis achievable | Remove infected coronal pulp; retain tooth with SSC |
| Pulpectomy | Irreversible pulpitis or necrosis in restorable primary tooth; selected abscessed teeth | Remove canal infection; obturate resorbable material; restore |
| Extraction | Non-restorable, advanced infection, root resorption near loss, pathology threatening successor, failed pulp therapy | Eliminate disease; plan space management |
Indirect Pulp Treatment (IPT / Indirect Pulp Cap)
Indication
Deep caries approximating pulp in a primary or young permanent tooth with:
- No spontaneous lingering pain pattern of irreversible disease
- No soft-tissue swelling/sinus of endodontic origin
- No radiographic furcation/periapical pathosis
- Restorable tooth
Procedure concept
- Rubber dam when possible.
- Remove peripheral caries completely (walls/DEJ).
- Leave deepest leathery dentin over pulp if removal would expose pulp—selective caries removal.
- Place biocompatible liner/base (Ca(OH)₂, RMGI, bioactive materials as taught).
- Definitive sealed restoration—SSC often preferred in primary molars with extensive involvement.
- Follow clinically and radiographically.
Evidence trend: IPT shows high success in carefully selected primary molars and is often preferred over invasive pulp entry when pulp is not exposed and symptoms fit reversible disease.
Stepwise excavation
Two-visit approach: temporary seal over incomplete caries removal, then re-enter later to remove remaining caries after tertiary dentin forms. Single-visit selective removal with excellent seal is widely accepted when case selection is sound.
Direct Pulp Capping in Primary Teeth
| Point | Teaching |
|---|---|
| Best case | Traumatic pin-point exposure or mechanical exposure in an otherwise healthy pulp with excellent isolation |
| Carious exposure in primary molars | Direct cap has historically poorer success than pulpotomy when pulp already inflamed by caries—many guidelines favor pulpotomy over direct cap for carious primary molar exposures |
| Materials | Ca(OH)₂ historically; MTA/calcium silicates improve seal and outcomes in vital pulp therapy generally |
| AFK trap | Choosing direct cap for large carious exposure with uncontrolled bleeding |
Pulpotomy (Primary Teeth)
Definition
Removal of the coronal pulp, treatment of remaining radicular pulp stumps, and placement of a medicament + sealed restoration (typically SSC).
Indications
- Vital primary tooth with carious or mechanical pulp exposure
- Radicular pulp judged healthy
- Hemorrhage from canal orifices controllable within minutes with gentle pressure
- No radiographic furcation/apical pathosis, no pathologic root resorption (beyond physiologic), no sinus tract
- Restorable (usually with SSC)
- Tooth should be retained for meaningful time (not about to exfoliate)
Contraindications
- Spontaneous pain with signs of radicular involvement / necrosis
- Uncontrollable hemorrhage from orifices (suggests radicular inflammation)
- Purulent drainage, necrotic coronal pulp with nonvital radicular tissue
- Furcation or periapical radiolucency
- Pathologic mobility, swelling of endodontic origin
- Non-restorable crown
Technique outline
- Profound LA + isolation.
- Remove caries; unroof pulp chamber fully.
- Amputate coronal pulp with slow-speed round bur or excavator (avoid perforating floor).
- Rinse; apply moist cotton pellet pressure for hemostasis (~1–5 minutes teaching).
- If bleeding stops → apply medicament to stumps.
- If bleeding persists → escalate to pulpectomy or extraction (radicular pulp unhealthy).
- Place IRM/base as indicated; restore with SSC same day ideally.
Medicaments: formocresol vs MTA (and others)
| Medicament | Mechanism / notes | AFK relevance |
|---|---|---|
| Buckley’s formocresol (diluted) | Fixation/devitalization of superficial pulp tissue; long clinical history; high reported clinical success historically | Still recognized historically; concerns about toxicity, mutagenicity, systemic distribution—many programs shifted away |
| MTA (mineral trioxide aggregate) | Calcium silicate cement; excellent seal, biocompatible, promotes hard-tissue barrier | Preferred modern pulpotomy medicament in much contemporary teaching; higher success vs formocresol in multiple studies |
| Other calcium silicates / bioceramics | Similar bioactive philosophy to MTA | Modern alternatives |
| Ferric sulfate | Hemostatic coagulation barrier; not a fixative like formocresol | Acceptable alternative in many protocols |
| Sodium hypochlorite (lavage) | Antimicrobial hemostasis aid before medicament | Adjunctive use |
| Calcium hydroxide | Historically used; higher internal resorption rates in primary pulpotomy than MTA/formocresol in classic comparisons | Less favored as primary molar pulpotomy agent alone |
| Laser / electrosurgery | Alternative “devitalization” methods in some protocols | Recognition-level |
Exam stance: Know that MTA/bioceramic pulpotomy is the modern gold-standard direction; formocresol remains high-yield for legacy questions and comparison of risks/benefits. Success still depends on case selection + coronal seal (SSC).
Success criteria and follow-up
- Asymptomatic, no mobility/swelling
- Soft tissues normal
- Radiographs: no new furcation pathosis; physiologic resorption OK; watch for internal resorption
- Premature exfoliation or over-retention of primary tooth occasionally occurs—monitor successor eruption path
Pulpectomy (Primary Teeth)
Definition
Removal of all pulp tissue from chamber and canals of a primary tooth, disinfection, and obturation with a resorbable material, then definitive restoration.
Indications
- Irreversible pulpitis or necrosis in a restorable primary tooth
- Selected teeth with furcation/periapical involvement when roots and bone allow and successor is not imminently needing the space pathologically
- Strategic tooth needed as space maintainer (e.g., second primary molar before first permanent molar eruption)—if prognosis reasonable
Contraindications
- Non-restorable tooth
- Advanced pathologic root resorption
- Severe bone loss / hopeless periodontal support
- Underlying dentigerous pathology or threat to permanent bud that extraction better serves
- Uncooperative setting where quality isolation impossible and referral/OR not available (practical)
Technique concepts
| Step | Teaching |
|---|---|
| Access | Full chamber unroofing; locate canals (primary molars: typically multiple canals, ribbon shapes) |
| Working length | Short of radiographic apex / permanent bud—avoid over-extension into follicle |
| Instrumentation | Gentle filing; primary roots thin/resorbing—avoid aggressive lateral perforation |
| Irrigation | NaOCl carefully (lower concentration/extra caution for open apices/bud); saline; avoid extrusion |
| Obturation materials | Resorbable: zinc oxide–eugenol (non-reinforced careful use), iodoform-containing pastes (e.g., Vitapex/Metapex-type Ca(OH)₂ + iodoform), other resorbable pastes—should resorb with roots |
| Do not | Use permanent gutta-percha as routine primary obturation (does not resorb with root; interferes with exfoliation/eruption) |
| Restoration | SSC strongly preferred for primary molars after pulpectomy |
Prognosis notes
Success lower than vital pulpotomy in some series when infection established; still valuable to retain strategic molars. Failure → extract + space management.
Extraction Decisions
Extract when:
- Tooth is non-restorable
- Severe infection with poor prognosis
- Root tips/pathosis endanger permanent tooth development
- Remaining root length minimal (near exfoliation)
- Failed pulp therapy with persistent disease
- Balancing extraction sometimes considered for severe space/eruption problems (usually with ortho input)
After extraction of primary molars (especially second primary molars): plan space maintenance (Section 20.3) unless successor is erupting imminently or space is otherwise secured.
Young Permanent Teeth (Crossover)
Primary-focused chapter, but AFK mixes:
| Situation | Direction |
|---|---|
| Immature permanent with vital exposure | Partial/full pulpotomy or cap (apexogenesis) with MTA—preserve vitality for root growth |
| Immature permanent necrotic | Regenerative endodontics or apexification (endo chapter) |
| Mature permanent | Standard RCT if irreversible/necrotic |
Do not apply primary formocresol pulpotomy recipes uncritically to permanent teeth.
Decision tree (memorize)
- Restorable? No → extract (± space maintainer).
- Deep caries, no exposure, reversible picture, normal radiograph? → IPT + sealed restoration/SSC.
- Exposure, vital, hemostasis OK, normal radicular status? → pulpotomy + SSC (MTA preferred modern).
- Irreversible/necrosis or pulpotomy bleeding will not stop, but restorable? → pulpectomy + resorbable fill + SSC.
- Hopeless infection/non-restorable/near exfoliation? → extract.
Rapid review list
- IPT: no exposure, vital, reversible—best conservative deep caries care
- Carious primary molar exposure → pulpotomy usually > direct cap
- Pulpotomy needs controllable orifice bleeding and clean radiographs
- MTA preferred modern pulpotomy agent; formocresol historical + toxicity concerns
- Pulpectomy: resorbable obturation; protect permanent bud
- SSC crowns most pulp-treated primary molars
- Extract + space plan when prognosis poor
Section 20.3 covers trauma differences in the primary dentition and space maintainers after early loss.
Indirect pulp treatment is most appropriate when:
After a primary molar pulpotomy, hemorrhage from the canal orifices remains brisk and unstoppable with pressure. The best next management direction is:
Compared with formocresol, mineral trioxide aggregate (MTA) for primary molar pulpotomy is best characterized as:
Which obturation approach is most appropriate after pulpectomy of a restorable primary molar?