CTZ vs. Guedes-Pinto Paste in Necrotic Teeth: Which Endodontic Material Performs Better?

The management of necrotic teeth, particularly in pediatric and mixed dentition, remains a clinical challenge due to the presence of polymicrobial infection, periapical inflammation, and complex root canal anatomy. Intracanal medicaments and obturation pastes play a critical role in controlling infection and promoting periapical healing.

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Among the materials most frequently discussed in Latin American pediatric dentistry are CTZ paste and Guedes-Pinto paste, both widely used as alternatives to conventional endodontic protocols. This article provides an evidence-based comparison of their composition, mechanisms of action, clinical performance, and limitations in the treatment of necrotic teeth.

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✅ Composition of CTZ Paste
CTZ paste is composed of:

▪️ Chloramphenicol
▪️ Tetracycline
▪️ Zinc oxide–eugenol
This combination offers broad-spectrum antimicrobial activity, targeting aerobic and anaerobic bacteria commonly associated with endodontic necrosis. Zinc oxide–eugenol serves as a vehicle and obturation medium, providing sealing ability and mild anti-inflammatory effects.

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✅ Composition of Guedes-Pinto Paste
Guedes-Pinto paste consists of:

▪️ Rifampicin
▪️ Prednisolone
▪️ Camphorated paramonochlorophenol (CMCP)
This formulation combines antimicrobial, anti-inflammatory, and analgesic properties, making it particularly suitable for infected primary teeth. The corticosteroid component helps reduce periapical inflammation, while CMCP enhances antibacterial efficacy.

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✅ Mechanisms of Action

CTZ Paste
▪️ Inhibits bacterial protein synthesis via tetracycline and chloramphenicol
▪️ Provides chemical disinfection without mechanical instrumentation
▪️ Acts as a long-term antimicrobial obturating material

Guedes-Pinto Paste
▪️ Disrupts bacterial cell metabolism through rifampicin and CMCP
▪️ Reduces inflammatory response via prednisolone
▪️ Promotes symptom relief and periapical tissue recovery

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✅ Clinical Performance in Necrotic Teeth
Clinical studies indicate that both materials demonstrate high success rates in necrotic primary teeth when properly indicated. CTZ paste is often associated with simplified single-visit protocols, while Guedes-Pinto paste shows favorable outcomes in cases with acute inflammation and pain. However, neither material should be considered a substitute for adequate diagnosis and case selection.

💬 Discussion
The choice between CTZ and Guedes-Pinto paste should be guided by clinical presentation, patient age, systemic considerations, and operator experience. CTZ paste offers prolonged antimicrobial action but raises concerns regarding antibiotic resistance and tooth discoloration. Guedes-Pinto paste provides strong anti-inflammatory effects but may present higher cytotoxic potential due to CMCP. Current evidence supports their use mainly in primary teeth, with limited indication in permanent dentition.

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🎯 Recommendations
▪️ Use CTZ paste in necrotic primary teeth requiring simplified endodontic protocols
▪️ Consider Guedes-Pinto paste in cases with acute inflammation or symptomatic necrosis
▪️ Avoid indiscriminate use due to antibiotic stewardship concerns
▪️ Always perform radiographic and clinical follow-up

✍️ Conclusion
Both CTZ and Guedes-Pinto pastes are effective materials for managing necrotic teeth, particularly in pediatric dentistry. Their success depends on appropriate case selection, understanding of their pharmacological properties, and adherence to evidence-based protocols. Neither material replaces conventional endodontic principles, but both remain valuable tools when used judiciously.

📊 Comparative Table: Clinical Characteristics of a Necrotic Tooth

Clinical Feature	Diagnostic Indicators	Clinical Implications
Loss of pulp vitality	Negative thermal and electric pulp tests	Indicates irreversible pulp damage
Periapical radiolucency	Radiographic evidence of bone loss	Suggests chronic periapical infection
Tooth discoloration	Gray or dark crown appearance	Common in long-standing necrosis
Possible fistula or abscess	Clinical drainage or swelling	Requires immediate infection control

📚 References

✔ Guedes-Pinto, A. C., Paiva, J. G., & Bozzola, J. R. (1981). Endodontic treatment of primary teeth with a paste containing antibiotics and corticosteroids. Journal of Dentistry for Children, 48(2), 144–147.
✔ Rifkin, A. (1980). A simple, effective endodontic technique for primary teeth. Journal of Dentistry for Children, 47(6), 435–441.
✔ Santos, P. S., & de Araujo, F. B. (2009). Antimicrobial activity of CTZ paste in primary teeth. International Journal of Paediatric Dentistry, 19(6), 397–401. https://doi.org/10.1111/j.1365-263X.2009.01007.x
✔ Leonardo, M. R., & Silva, L. A. B. (2008). Endodontia: Tratamento de canais radiculares. São Paulo: Artes Médicas.

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