Complete Guide to Pulp Therapy in Primary Teeth: Materials, Techniques, and Success Rates

Pulp therapy in primary teeth is a cornerstone of pediatric dentistry, aiming to maintain tooth vitality, prevent infection, and preserve arch space until natural exfoliation.

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Advances in biomaterials such as MTA, Biodentine, and improved clinical protocols have significantly increased success rates. Understanding the differences between pulpotomy, pulpectomy, indirect pulp treatment (IPT), and apexification is essential for evidence-based care.

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✅ Pulp Therapy Techniques

➤ Indirect Pulp Treatment (IPT)
IPT is indicated when deep caries is present but the tooth remains vital and asymptomatic. Selective caries removal minimizes pulp exposure and promotes remineralization. High-fluoride glass ionomer and resin-modified glass ionomer (RMGI) are widely used as liners.

➤ Direct Pulp Cap (DPC)
Used when a small mechanical pulp exposure occurs. Bioceramics like MTA and Biodentine create a durable dentin bridge and exhibit excellent biocompatibility.

➤ Pulpotomy
Indicated in cases of carious pulp exposure with preserved radicular pulp vitality. Popular medicaments include MTA, Biodentine, and historically formocresol, although the latter is no longer recommended due to toxicity concerns.

➤ Pulpectomy
Indicated for irreversible pulpitis or necrosis. It consists of removing necrotic tissue and obturating canals with resorbable materials such as iodoform-based pastes (Vitapex, Metapex) or zinc oxide–eugenol.

➤ Apexogenesis & Apexification in Young Permanent Teeth
Although not used in primary teeth, they are fundamental when treating immature permanent teeth with open apices.

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✅ Materials Used in Pulp Therapy

➤ Mineral Trioxide Aggregate (MTA)
Known for high biocompatibility, antibacterial properties, and superior long-term sealing.

➤ Biodentine
A bioactive dentin substitute with faster setting time and strong pulpal healing potential.

➤ Zinc Oxide–Eugenol (ZOE)
Traditional obturation material for primary teeth, but less favorable in cases requiring complete resorption.

➤ Iodoform-based Pastes (Vitapex/Metapex)
Preferred for pulpectomy due to their resorbability and antimicrobial action.

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✅ Success Rates

▪️ IPT: 90–97% (AAPD, 2021)
▪️ Pulpotomy with MTA: 90–95%
▪️ Pulpotomy with Biodentine: 88–94%
▪️ Pulpectomy: 70–85%, depending on canal anatomy and material used

📊 Comparative Table: Differences Between Pulp Therapy Techniques

Aspect	Advantages	Limitations
Indirect Pulp Treatment (IPT)	High success rates; preserves vitality; minimally invasive	Requires excellent diagnosis; risk of residual caries
Direct Pulp Cap (DPC)	Promotes dentin bridge formation; effective with bioceramics	Not suitable for carious exposures; requires ideal isolation
Pulpotomy	High success with MTA/Biodentine; preserves radicular pulp vitality	Failure if radicular pulp is inflamed or infected
Pulpectomy	Indicated for necrotic teeth; removes infection; allows tooth preservation	Technique sensitive; lower success rates; requires resorbable obturants
Apexogenesis	Allows continued root development	Not applicable to primary teeth
Apexification	Induces apical closure in young permanent teeth	Long treatment time; not used in primary teeth

💬 Discussion
The choice of pulp therapy depends on diagnosis, degree of inflammation, tooth restorability, and patient behavior. Vital pulp therapies (IPT, DPC, pulpotomy) consistently show higher long-term success than pulpectomy. Modern biomaterials like MTA and Biodentine have replaced older agents due to improved healing outcomes and safety profiles.

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🔎 Recommendations
▪️ Prioritize vital pulp therapies when pulp vitality is preserved.
▪️ Use bioceramics (MTA, Biodentine) as first-line agents.
▪️ Perform pulpectomy only when irreversible pulpitis or necrosis is confirmed.
▪️ Seal treated teeth with stainless steel crowns for long-term success.
▪️ Follow AAPD guidelines for diagnostic criteria and material selection.

✍️ Conclusion
Pulp therapy in primary teeth is highly successful when clinicians use accurate diagnostic criteria and evidence-based materials. Modern biomaterials have improved outcomes and reduced complications, making pulp conservation the preferred approach whenever possible. A clear understanding of each technique ensures predictable and biologically sound results.

📚 References

✔ American Academy of Pediatric Dentistry. (2021). Pulp therapy for primary and immature permanent teeth. AAPD Clinical Guidelines. https://www.aapd.org
✔ Hegde, S., & Bhat, S. S. (2019). Clinical evaluation of MTA and Biodentine as pulpotomy agents in primary teeth. Journal of Indian Society of Pedodontics and Preventive Dentistry, 37(3), 307–315. https://doi.org/10.4103/JISPPD.JISPPD_217_18
✔ Jeon, H. J., Kim, J., & Kim, Y. (2020). Outcomes of vital pulp therapy using bioceramic materials. Restorative Dentistry & Endodontics, 45(3), e32. https://doi.org/10.5395/rde.2020.45.e32
✔ Nowicka, A., Lipski, M., Parafiniuk, M., et al. (2013). Biodentine vs. MTA in direct pulp capping. Journal of Endodontics, 39(6), 743–747. https://doi.org/10.1016/j.joen.2013.01.005

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Pulp Capping in Dentistry: How the Dental Pulp Is Protected (Updated Clinical Guide)

Pulp capping is a key minimally invasive procedure used to preserve the vitality of the dental pulp after exposure or near exposure due to caries or trauma.

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Modern bioactive materials—including calcium hydroxide, MTA, and Biodentine—have significantly improved success rates by promoting dentin bridge formation and reducing pulpal inflammation.

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✅ What Is Pulp Capping?
Pulp capping is a conservative dental procedure in which a biocompatible and bioactive material is placed over the pulp or affected dentin to stimulate healing, reduce inflammation, and promote reparative dentin formation. It is indicated in cases of:

▪️ Deep caries approaching the pulp
▪️ Mechanical exposure during cavity preparation
▪️ Traumatic exposure in young teeth with open apices
▪️ Reversible pulpitis

Two main types exist:
▪️ Direct pulp capping – placed directly over an exposed pulp.
▪️ Indirect pulp capping – placed over deep dentin close to the pulp but without exposure.

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✅ Mechanism of Action
Modern pulp-capping materials protect the pulp through several biological processes:

▪️ Antibacterial activity (e.g., calcium hydroxide has high pH).
▪️ Sealing ability that prevents microleakage.
▪️ Bioactivity, stimulating odontoblast-like cell differentiation.
▪️ Release of calcium ions, promoting mineralization and dentin bridge formation.
▪️ Reduction of pulpal inflammation and support of tissue regeneration.

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✅ Common Materials and Commercial Names

1. Calcium Hydroxide (Ca(OH)₂)
Commercial names: Dycal®, Life®, Calcimol®
Key actions: High pH antibacterial effect; stimulates mineralized bridge formation.

2. Mineral Trioxide Aggregate (MTA)
Commercial names: ProRoot® MTA, MTA Angelus®
Key actions: Excellent sealing, biocompatibility, promotes strong dentin bridge formation.

3. Biodentine® (Tricalcium Silicate Cement)
Commercial name: Biodentine® (Septodont)
Key actions: Bioactivity, fast setting time, high mechanical strength, pulp regeneration support.

4. Resin-Modified Calcium Silicate Materials
Commercial names: TheraCal LC®, BioCal®
Key actions: Light-cured convenience, calcium release, improved handling properties.

📊 Comparative Table: Pulp Capping Materials

Aspect	Advantages	Limitations
Calcium Hydroxide	Antibacterial; inexpensive; widely available	Poor long-term seal; tunnel defects in dentin bridge
MTA	Excellent sealing; high biocompatibility; strong dentin bridge	Long setting time; higher cost; potential discoloration

💬 Discussion
Advances in bioceramic materials have transformed pulp protection, offering predictable outcomes with high long-term vitality rates. MTA and Biodentine outperform traditional calcium hydroxide in sealing ability and dentin bridge quality, although calcium hydroxide remains widely used due to affordability and ease of application. Material selection depends on exposure type, tooth vitality, patient age, and clinical resources.

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✍️ Conclusion
Modern pulp capping techniques effectively protect the dental pulp, arrest inflammation, and promote natural dentin regeneration. Evidence consistently supports bioactive materials—particularly MTA and Biodentine—as the gold standard for vital pulp therapy. Appropriate case selection and strict isolation significantly increase long-term success.

🔎 Recommendations
▪️ Use rubber dam isolation to prevent contamination during pulp capping.
▪️ Prefer MTA or Biodentine for direct exposures in young permanent teeth.
▪️ Use indirect pulp capping when possible to avoid unnecessary pulpal exposure.
▪️ Follow up clinically and radiographically at 6 and 12 months.
▪️ Educate patients about symptoms of pulpal complications (persistent pain, swelling).

📚 References

✔ Bjørndal, L., & Ludwig, S. (2022). Management of deep caries and pulpal protection strategies. International Endodontic Journal, 55(Suppl. 1), 59–73. https://doi.org/10.1111/iej.13743
✔ Celik, E. U., & Unever, S. (2020). Success rates of pulp capping materials in vital pulp therapy. Journal of Endodontics, 46(8), 1061–1067. https://doi.org/10.1016/j.joen.2020.04.008
✔ Cox, C. F., Subay, R. K., Suzuki, S., & Suzuki, S. H. (2017). Pulp capping materials: A review of the literature. Dental Materials, 33(7), 745–758. https://doi.org/10.1016/j.dental.2017.03.006
✔ Torabinejad, M., & Parirokh, M. (2010). Mineral trioxide aggregate: A comprehensive literature review. Part II: Clinical applications. Journal of Endodontics, 36(2), 190–202. https://doi.org/10.1016/j.joen.2009.09.010

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Medications for Pulp Capping in Primary Teeth: Indications, Composition, and Clinical Management

Pulp capping in primary teeth is a conservative procedure aimed at preserving pulp vitality following an accidental or intentional pulp exposure during caries removal.

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Its success largely depends on the material or medication used, which must be biocompatible, promote tissue repair, and provide an adequate marginal seal. With advances in biomaterials, the range of available products has expanded, making it essential to understand their properties, advantages, and limitations for proper clinical application.

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✅ Main Medications Used

1. Calcium Hydroxide (Ca(OH)₂)

➤ Composition: Pure calcium hydroxide or formulated with hardening agents (e.g., Dycal®).
➤ Indications: Small pulp exposures without prolonged bleeding, in vital primary teeth.
➤ Advantages:
° Stimulates reparative dentin formation.
° Antibacterial properties.
° Easy to handle.
➤ Disadvantages:
° Soluble in oral fluids.
° Poor sealing ability.
° Fragile under mechanical stress.
➤ Handling: Apply a thin layer over the exposure, followed by a protective material such as resin-modified glass ionomer (RMGI).

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2. Mineral Trioxide Aggregate (MTA)

➤ Composition: Calcium, silicate, and aluminum oxides. Commercial examples: ProRoot® MTA, MTA Angelus®.
➤ Indications: Direct pulp capping in vital pulps, small pulp perforations.
➤ Advantages:
° High biocompatibility.
° Excellent sealing ability.
° Stimulates dentin bridge formation.
➤ Disadvantages:
° High cost.
° Long setting time (~2–4 hours).
° Difficult to manipulate.
➤ Handling: Mix with sterile distilled water and apply over the pulp; allow complete setting before final restoration.

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3. Biodentine®

➤ Composition: Calcium oxide, tricalcium silicate, zirconium oxide (radiopacifier).
➤ Indications: Modern alternative to MTA for direct pulp capping.
➤ Advantages:
° Faster setting time (~12 minutes).
° Biocompatible.
° Better mechanical properties than MTA.
➤ Disadvantages:
° High cost.
° May require training for proper handling.
➤ Handling: Applied directly to the exposure with a spatula, no intermediate layer needed.

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4. Zinc Oxide Eugenol (ZOE)

➤ Composition: Zinc oxide mixed with eugenol.
➤ Indications: Indirect pulp capping only (not for direct use) due to cytotoxicity risks.
➤ Advantages:
° Sedative effect on pulp tissue.
° Easy handling.
Disadvantages:
° Cytotoxic if in direct contact with the pulp.
° Inhibits polymerization of resin composites.
➤ Handling: Used as a base in deep cavities with no pulp exposure.

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5. Resin-Modified Glass Ionomer (RMGI)

➤ Composition: Polyalkenoic acid, fluoroaluminosilicate glass, hydrophilic resin (HEMA).
➤ Indications: Intermediate layer over medications like Ca(OH)₂ or MTA.
➤ Advantages:
° Excellent adhesion to dentin.
° Fluoride release.
° Good mechanical resistance.
➤ Disadvantages:
° Should not be used alone in direct contact with pulp.
➤ Handling: Apply with microbrush or spatula, light-cure, and proceed with final restoration.

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💡 Conclusion
Choosing the appropriate medication for pulp capping in primary teeth should consider factors such as exposure size, pulp vitality, the material's ability to stimulate dentinogenesis, handling properties, and cost. While calcium hydroxide remains widely used, materials like MTA and Biodentine offer significant advantages in sealing ability and biocompatibility. Using an additional protective layer, such as RMGI, improves treatment longevity and reduces microleakage risk. Continuous education in modern biomaterials is essential for achieving predictable and successful outcomes in pediatric dentistry.

📚 References

✔ Aguilar, P., & Linsuwanont, P. (2011). Vital pulp therapy in vital permanent teeth with cariously exposed pulp: A systematic review. Journal of Endodontics, 37(5), 581–587. https://doi.org/10.1016/j.joen.2010.12.004

✔ Fuks, A. B. (2008). Vital pulp therapy with new materials for primary teeth: New directions and treatment perspectives. Journal of Endodontics, 34(7 Suppl), S18–S24. https://doi.org/10.1016/j.joen.2008.02.028

✔ Murray, P. E., García-Godoy, F., & Hargreaves, K. M. (2007). Regenerative endodontics: A review of current status and a call for action. Journal of Endodontics, 33(4), 377–390. https://doi.org/10.1016/j.joen.2006.09.013

✔ Nowicka, A., Lipski, M., Parafiniuk, M., Sporniak-Tutak, K., Lichota, D., Kosierkiewicz, A., … & Buczkowska-Radlińska, J. (2013). Response of human dental pulp capped with biodentine and mineral trioxide aggregate. Journal of Endodontics, 39(6), 743–747. https://doi.org/10.1016/j.joen.2013.01.005

✔ Rodd, H. D., Waterhouse, P. J., Fuks, A. B., Fayle, S. A., & Moffat, M. A. (2006). Pulp therapy for primary molars. International Journal of Paediatric Dentistry, 16(s1), 15–23. https://doi.org/10.1111/j.1365-263X.2006.00774.x

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