Vital Pulp Therapies
Endodontics · Conservative Pulp Management
TL;DR
Vital pulp therapies preserve the living pulp to maintain root formation, retain tooth structure, and avoid full root canal treatment. The four main techniques — indirect pulp capping, direct pulp capping, partial pulpotomy, and full coronal pulpotomy — are indicated depending on the depth of caries/exposure and the clinical status of the pulp. MTA (mineral trioxide aggregate) and Biodentine are the preferred capping agents due to their superior biocompatibility and dentine bridge formation compared to calcium hydroxide.
- Indirect pulp capping: A thin layer of carious dentine is left over the pulp, covered with a biocompatible material and sealed. Best for deep caries approaching the pulp in a vital, symptom-free tooth. Avoids pulp exposure entirely.
- Direct pulp capping: A capping agent (MTA or Biodentine preferred) is placed directly over a small mechanical or carious pulp exposure in a vital pulp. Best success when the exposure is small (<1 mm), haemostasis can be achieved, and pulp shows no signs of irreversible inflammation.
- Partial (Cvek) pulpotomy: Removal of 1–3 mm of inflamed coronal pulp tissue from beneath an exposure. Preferred for traumatic exposures in young teeth. MTA placed over the wound site. High success rates (90%+) in immature permanent teeth.
- Full coronal pulpotomy: Removal of the entire coronal pulp to the orifice level; radicular pulp left in situ. Used in mature permanent teeth as an alternative to RCT when the radicular pulp is healthy. High success with MTA or Biodentine.
- Key agent distinction: MTA/Biodentine preferred over calcium hydroxide due to superior seal, less tunnel defect formation, and better long-term outcomes — especially for direct pulp capping in permanent teeth.
Key Facts
What Is It?
Vital pulp therapies (VPT) are a spectrum of conservative interventions that aim to preserve the vitality of all or part of the dental pulp rather than removing it entirely (as in root canal treatment). The rationale is that a vital pulp is more desirable than a non-vital, endodontically treated tooth: it maintains proprioception, provides continued dentine formation, allows the root to complete development in immature teeth, and is inherently more resistant to fracture than a non-vital tooth.
The modern evidence base for VPT has expanded substantially with the development of biocompatible calcium silicate-based materials — primarily MTA (ProRoot MTA) and Biodentine — which demonstrate superior outcomes compared to the historically used calcium hydroxide. Current evidence suggests that VPT is viable not only in clearly vital pulps exposed by mechanical cavity preparation, but also in cases of carious exposure where the pulp was previously considered irreversibly inflamed.
Why It Matters
Understanding the selection criteria, technique, and materials for each VPT modality is heavily tested on the INBDE. Key distinctions include: indirect vs direct pulp capping (no exposure vs exposure), partial vs full pulpotomy (depth of tissue removal), primary vs permanent tooth pulpotomy (different agents and goals), and calcium hydroxide vs MTA/Biodentine (mechanism and outcomes). Additionally, VPT in immature permanent teeth is critically important — preserving pulp vitality allows apexogenesis (continued root development), without which the tooth remains with thin, fragile root walls and an open apex that significantly complicates any future treatment.
Indirect Pulp Capping (IPC)
Indications and Technique
Indirect pulp capping is indicated when deep caries approaches the pulp but the pulp has NOT been exposed. The goal is to halt caries progression, allow remineralisation of the remaining affected dentine overlying the pulp, and stimulate tertiary (reactionary) dentine formation — all while avoiding pulp exposure.
The classical two-step technique involves: (1) removing all infected, soft, outer carious dentine but intentionally leaving a thin layer of affected (firm, discoloured but not infected) dentine over the pulp to avoid exposure; (2) placing a biocompatible liner (traditionally calcium hydroxide, now often glass ionomer or Biodentine) over the remaining dentine, then sealing the cavity completely with a permanent or well-sealing temporary restoration; (3) reviewing at 6–12 weeks and, in the original two-step approach, re-entering and removing the residual dentine (which may now be remineralised) to confirm no exposure — though current evidence supports a one-step approach leaving the dentine in place permanently and restoring definitively at the first visit, avoiding the re-entry step.
Contraindications to IPC: Signs of irreversible pulpitis (spontaneous pain, lingering pain >30 seconds to cold, sinus tract, swelling); radiographic periapical pathology; pathological root resorption; presence of pulp exposure discovered during caries removal (requires DPC or pulpotomy).
Direct Pulp Capping (DPC)
Indications
Direct pulp capping places a biocompatible capping agent directly onto an exposed vital pulp to stimulate healing and hard tissue barrier formation (dentine bridge), preserving pulp vitality. The exposure may be:
- Mechanical (iatrogenic) exposure: Exposure caused by the bur during cavity preparation in an otherwise healthy tooth. Classic scenario for DPC — the pulp was healthy before the procedure; prognosis is excellent.
- Carious exposure: Exposure occurring during removal of deep caries. More controversial — the pulp was likely inflamed before exposure. Success rates are lower than for mechanical exposures, and the degree of pulpal inflammation is the key determinant of outcome.
- Traumatic exposure: Fracture exposing the pulp (e.g., complicated crown fracture). If the exposure is small and recent (<24–48 hours), DPC or partial pulpotomy may be appropriate. For exposures >48 hours or with evidence of contamination, pulpotomy is preferred.
Prerequisites for DPC: Vital, responsive pulp; absence of spontaneous pain or prolonged thermal response; small exposure (<1 mm ideal; up to 2–3 mm possible with MTA); haemostasis achievable within a few minutes of gentle pressure with a sterile cotton pellet; no radiographic periapical pathology; no pathological root resorption; clean field (rubber dam isolation mandatory).
Capping Agents
| Agent | Mechanism | Advantages | Disadvantages | Current Status |
|---|---|---|---|---|
| MTA (Mineral Trioxide Aggregate) | Calcium silicate; releases Ca²⁺ and OH⁻; stimulates odontoblast-like cell differentiation; seals dentinal tubules | Excellent seal; superior dentine bridge quality (fewer tunnel defects); high biocompatibility; antibacterial; well-studied | Long setting time (2.5–4 hours); difficult to handle; grey MTA can discolour teeth | Preferred agent — gold standard |
| Biodentine | Tricalcium silicate; faster setting than MTA (12 min); similar biological properties | Faster setting; better handling; white (less discolouration); good seal | Less long-term evidence than MTA; slightly more expensive | Co-preferred with MTA; excellent choice particularly for anterior teeth |
| Calcium hydroxide (Ca(OH)₂) | High pH kills bacteria; stimulates tertiary dentine formation via inflammatory mechanism | Inexpensive; proven long-term track record; antibacterial | Forms tunnel defects in dentine bridge; soluble over time; bridge may degrade; inferior long-term outcomes vs MTA | Acceptable but not preferred; replaced by MTA/Biodentine in contemporary practice |
| Calcium hydroxide + iodoform (e.g., Vitapex) | CaOH + iodoform; antibacterial; resorbable | Resorbable — used in primary teeth and as temporary agent | Not a definitive capping material | Primary teeth; temporary; not for permanent DPC |
Outcomes
Success rates for DPC with MTA/Biodentine in mechanical exposures: 80–95% at 2–5 years. For carious exposures with MTA: 70–90% at 2 years (varies by study and pulp inflammation status). Success is defined as absence of symptoms, absence of pathological resorption, absence of periapical pathology, and maintained pulp vitality (positive response to cold/EPT). Dentine bridge formation is radiographically visible in 70–80% of successful cases at 3 months.
Pulpotomy
Pulpotomy is the removal of the coronal pulp (pulp within the crown) while preserving the radicular pulp (pulp within the root canals) in a vital, functional state. It is more invasive than DPC but less invasive than full RCT.
Partial (Cvek) Pulpotomy
First described by Cvek (1978) for management of traumatically exposed permanent teeth. A small amount of pulp tissue (1–3 mm) is removed from the exposure site to access bleeding vital tissue, and MTA is placed over this wound. The remaining coronal and radicular pulp is preserved.
- Classic indication: Complicated crown fracture with pulp exposure in an immature (open apex) permanent tooth — where preserving pulp vitality is essential to allow continued root development (apexogenesis).
- Also indicated: Large mechanical or carious exposures (>1 mm) where haemostasis cannot be achieved with gentle pressure, suggesting the superficial pulp is inflamed. Removing 1–3 mm of tissue often reaches healthy pulp where haemostasis is easily obtained.
- Technique: Remove 1–3 mm of pulp tissue with a sharp bur or spoon excavator under copious irrigation. Achieve haemostasis with a sterile cotton pellet moistened in saline or dilute sodium hypochlorite. Place MTA or Biodentine directly over the pulp wound. Restore the tooth with a bonded composite.
- Outcomes: Success rates exceed 90% in traumatically exposed immature permanent teeth treated within 72 hours. Allows continued root maturation (apexogenesis). Superior to full pulpotomy for this indication.
Full Coronal Pulpotomy (Mature Permanent Teeth)
Removal of the entire coronal pulp to the level of the canal orifices, preserving the radicular pulp. In the past, this was considered a temporising measure before full RCT, but contemporary evidence supports full coronal pulpotomy as a definitive treatment in selected cases of mature permanent teeth — even in cases of symptomatic IRP where the radicular pulp is judged to be healthy.
- Indication: Symptomatic or asymptomatic IRP in a mature permanent posterior tooth where the clinician assesses the radicular pulp is likely uninflamed; appropriate as an alternative to RCT particularly when access, magnification, or case complexity make full RCT higher risk.
- Evidence base: Multiple recent RCTs (including Simon et al., 2013; Asgary et al., 2018) demonstrate success rates of 80–90% at 2–5 years for full pulpotomy with MTA in mature permanent molars, comparable to RCT in selected cases.
- Technique: Under rubber dam isolation, remove all coronal pulp with a high-speed bur or ultrasonic, taking care not to tear the radicular pulp at the orifice. Achieve haemostasis. Place MTA or Biodentine at the orifice level. Restore with a bonded base and permanent crown (posterior teeth require cuspal coverage).
Primary Tooth Pulpotomy
Pulpotomy is the standard of care for deep carious lesions in primary teeth where the coronal pulp is involved but the radicular pulp is vital. The coronal pulp is removed and a medicament is placed over the radicular pulp before final restoration with a stainless steel crown (SSC). SSC is mandatory as the definitive restoration — composite or amalgam restorations alone have significantly higher failure rates after pulpotomy.
- Goal: Maintain the primary tooth until natural exfoliation to guide the permanent successor; prevent premature space loss.
- Medicaments (in current preference order):
- MTA or Biodentine: Preferred by current AAPD guidelines for superior biocompatibility; stimulates hard tissue formation; does not interfere with normal root resorption of the primary tooth.
- Ferric sulfate (15.5%): Haemostatic agent that causes agglutination of blood at the cut pulp surface; no toxic fixation of tissue; good outcomes; some AAPD-approved protocols.
- Formocresol (diluted 1:5): Historically the most widely used agent; causes fixation of radicular pulp tissue; acceptable outcomes; concerns about systemic toxicity (formaldehyde) and mutagenicity have led to replacement with MTA/ferric sulfate in contemporary guidelines. Still acceptable when alternatives unavailable per AAPD.
- Calcium hydroxide: NOT recommended for primary pulpotomy — causes progressive internal resorption of the primary root and premature exfoliation.
Vital Pulp Therapy — Technique Comparison
| Technique | Indication | Pulp Exposed? | Tissue Removed | Preferred Agent | Success Rate |
|---|---|---|---|---|---|
| Indirect Pulp Cap | Deep caries approaching pulp; no exposure; reversible symptoms | No | None — thin layer of affected dentine left | GIC liner, Biodentine, or CaOH over remaining dentine; seal permanently | 85–95% |
| Direct Pulp Cap | Small mechanical or carious exposure; vital pulp; haemostasis achieved | Yes (<1–3 mm) | None (cap placed directly on exposure) | MTA or Biodentine; CaOH acceptable | 80–95% (MTA); 60–80% (CaOH) |
| Partial (Cvek) Pulpotomy | Traumatic exposure; larger exposure; immature permanent tooth | Yes | 1–3 mm of coronal pulp at exposure site | MTA or Biodentine | >90% (traumatic; immature) |
| Full Coronal Pulpotomy | IRP or large carious exposure; mature permanent; healthy radicular pulp | Yes | Entire coronal pulp to orifice level | MTA or Biodentine at orifice | 80–90% |
| Primary Pulpotomy | Carious pulp exposure in primary tooth; vital radicular pulp | Yes | Entire coronal pulp | MTA, Biodentine, ferric sulfate, or formocresol; SSC required | 85–95% (MTA/Biodentine) |
Success Criteria
Success of VPT is defined at the 1-year and 5-year review by the following criteria:
- Clinical success: Absence of spontaneous pain, swelling, sinus tract, or pathological mobility. Continued positive response to thermal/EPT tests (confirms maintained vitality).
- Radiographic success: Absence of periapical pathology; absence of pathological root resorption; presence of a calcific barrier (dentine bridge) on periapical radiograph or CBCT (in DPC/partial pulpotomy); continued root development in immature teeth (apexogenesis).
- Histological success (research context): Odontoblast-like cell layer beneath the cap; well-formed mineralised bridge without tunnel defects; absence of pulp necrosis or acute inflammation at the repair site.
Clinical Considerations
- Rubber dam isolation is mandatory for all VPT procedures: Contamination of the exposure site with saliva dramatically reduces success rates — bacteria in the wound site trigger a severe inflammatory response that prevents dentine bridge formation and leads to pulp necrosis. All VPT must be performed under strict aseptic technique with rubber dam; if rubber dam cannot be placed, a different treatment approach should be considered.
- Haemostasis is the intraoperative prognostic indicator for DPC: If haemostasis cannot be achieved within 3–5 minutes of gentle pressure with a sterile cotton pellet, the pulp at the exposure site is likely irreversibly inflamed and DPC is unlikely to succeed. The appropriate response is to proceed with partial pulpotomy — remove 1–3 mm more tissue until haemostasis is easily achieved and the tissue appears healthy (pink, not dark red, profusely bleeding).
- Apexogenesis vs apexification: VPT in immature permanent teeth aims for apexogenesis — continued physiological root formation by the vital pulp/Hertwig’s epithelial root sheath. If VPT fails and the pulp becomes necrotic, apexification is required — this involves creating an apical barrier (MTA plug or calcium hydroxide long-term) before obturation, since the open apex cannot be adequately sealed with standard obturation. Apexogenesis is strongly preferred — the root walls in immature teeth are very thin and prone to fracture without continued development.
- Grey MTA and tooth discolouration: Original grey ProRoot MTA can cause grey-brown discolouration of the crown, particularly in anterior teeth. White MTA or Biodentine should be used for anterior teeth. When grey MTA is used in posterior teeth with a full crown restoration, discolouration is less clinically significant.
- Post-VPT monitoring schedule: Review at 1, 3, 6, and 12 months; annually thereafter up to 5 years. At each review: assess clinical symptoms, perform pulp sensitivity tests (cold, EPT), and take periapical radiographs to assess for dentine bridge formation, continued root development (immature teeth), and absence of periapical pathology. Do not diagnose failure based on a single finding — integrate all data points.
Common Mistakes & Misconceptions
-
Misconception: “Vital pulp therapy is only for immature teeth.”
Correction: While VPT is most critical in immature teeth (where preserving the pulp allows apexogenesis), it is also appropriate and evidence-based in mature permanent teeth. Full coronal pulpotomy in mature molars shows 80–90% success at 5 years — comparable to RCT in selected cases. The decision between pulpotomy and RCT in a mature tooth should be based on clinical evidence of radicular pulp health, not tooth maturity alone. -
Misconception: “Calcium hydroxide is the standard of care for direct pulp capping.”
Correction: MTA and Biodentine have superseded calcium hydroxide as the preferred DPC agents. Calcium hydroxide creates tunnel defects in the dentine bridge via localised necrosis at the cap site, allowing bacterial ingress over time. MTA and Biodentine produce denser, more complete bridges and demonstrate superior long-term success. Calcium hydroxide remains acceptable when MTA/Biodentine are unavailable. -
Misconception: “Carious pulp exposure always requires root canal treatment.”
Correction: Contemporary evidence supports VPT even for carious pulp exposures in selected cases — provided the pulp is vital, haemostasis can be achieved, and the patient is free of signs/symptoms of irreversible pulpitis (spontaneous pain, extreme cold sensitivity, sinus tract, swelling). Success rates for MTA DPC in carious exposures are 70–85%, which supports VPT as a first-line approach before RCT. -
Misconception: “Calcium hydroxide is safe and effective for primary tooth pulpotomy.”
Correction: Calcium hydroxide is contraindicated for primary pulpotomy because it causes progressive pathological internal resorption of the primary root — leading to premature tooth loss. This is a frequently tested INBDE Board trap. The approved agents for primary pulpotomy are MTA, Biodentine, ferric sulfate, and formocresol. -
Misconception: “If haemostasis is not achieved with DPC, the treatment has failed.”
Correction: Failure to achieve haemostasis at the DPC site is a clinical indicator that the pulp at that level is inflamed — not that VPT has failed. The correct response is to escalate to partial pulpotomy: remove 1–3 mm of tissue and re-assess haemostasis. This step-wise approach allows appropriate treatment selection based on the actual state of the pulp encountered rather than abandoning VPT prematurely.
Related Topics
References & Sources
- Cvek M, 1978. A clinical report on partial pulpotomy and capping with calcium hydroxide in permanent incisors with complicated crown fractures. Journal of Endodontics, 4(8), 232–237.
- Zanini M, Sautier JM, Berdal A, Simon S, 2012. Biodentine induces immortalized murine pulp cell differentiation into odontoblast-like cells and stimulates biomineralization. Journal of Endodontics, 38(9), 1220–1226.
- Mente J, Georg T, Pfefferle T, et al., 2010. Treatment outcome of mineral trioxide aggregate or calcium hydroxide direct pulp capping: long-term results. Journal of Endodontics, 36(11), 1771–1778.
- Simon S, Verma P, Tomson P, et al., 2013. Molecular characterization of young and mature odontoblasts in the context of vital pulp therapy. Journal of Dental Research, 92(3), 201–208.
- AAPD (American Academy of Pediatric Dentistry), 2022. Pulp Therapy for Primary and Immature Permanent Teeth. Reference Manual.
- Asgary S, Eghbal MJ, Fazlyab M, Baghban AA, Ghoddusi J, 2015. Five-year results of vital pulp therapy in permanent molars with irreversible pulpitis. Journal of Dental Research, 94(10), 1400–1406.
- Kundzina R, Stangvaltaite L, Eriksen HM, Kerosuo E, 2017. Capping carious exposures in adults: a randomized controlled trial investigating mineral trioxide aggregate versus calcium hydroxide. International Endodontic Journal, 50(10), 924–932.
- Taha NA, Abdelkhader SZ, 2018. Outcome of full pulpotomy using Biodentine in adult patients with symptoms indicative of irreversible pulpitis. International Endodontic Journal, 51(8), 819–828.
Summary
Vital pulp therapies preserve pulp vitality through a spectrum of techniques matched to the extent of carious or traumatic pulp involvement. Indirect pulp capping manages deep caries without exposure; direct pulp capping addresses small exposures using MTA or Biodentine as the preferred capping agent; partial (Cvek) pulpotomy is the treatment of choice for traumatic exposures in immature permanent teeth; and full coronal pulpotomy in mature teeth offers an evidence-based alternative to root canal treatment. MTA and Biodentine have superseded calcium hydroxide as the preferred agents due to superior dentine bridge quality and long-term outcomes. In primary teeth, calcium hydroxide is specifically contraindicated for pulpotomy — MTA, Biodentine, ferric sulfate, or formocresol are the accepted agents. All VPT requires rubber dam isolation, haemostasis confirmation, and long-term radiographic monitoring.
Key Takeaways
- IPC vs DPC: No exposure = IPC (leave carious dentine, seal permanently); exposure present = DPC (place MTA/Biodentine directly on exposed pulp). The presence or absence of pulp exposure determines the technique.
- Preferred capping agent: MTA and Biodentine are now preferred over calcium hydroxide — they produce denser dentine bridges with fewer tunnel defects, better seal, and superior long-term success. CaOH remains acceptable but is second-line.
- Cvek pulpotomy: Partial removal of 1–3 mm of pulp tissue for traumatic exposures — especially in immature permanent teeth where preserving vitality is essential for continued root development (apexogenesis).
- Primary teeth: Calcium hydroxide is CONTRAINDICATED for primary pulpotomy (causes internal resorption and premature tooth loss). Use MTA, Biodentine, ferric sulfate, or formocresol. SSC is mandatory as the definitive restoration.
- Haemostasis = intraoperative decision point: If haemostasis is not achieved in 3–5 min with DPC, escalate to partial pulpotomy — do not attempt DPC on an actively bleeding wound. Each step deeper reveals the true level of pulp health.
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