Iodoform-calcium hydroxide pastes have gained attention as a potential alternative to CTZ paste in pediatric endodontics. While CTZ (chloramphenicol, tetracycline, zinc oxide-eugenol) has demonstrated clinical success, concerns regarding antibiotic resistance, cytotoxicity, and regulatory restrictions have prompted the search for safer substitutes.
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✅ Introduction
The management of infected primary teeth often relies on obturation materials with antimicrobial properties and biocompatibility. CTZ paste has been widely used due to its broad-spectrum antibacterial action, but its composition—particularly chloramphenicol—raises safety concerns.
In contrast, iodoform-calcium hydroxide pastes (e.g., Vitapex®, Metapex®) have emerged as promising alternatives due to their resorbability and favorable biological profile. This article explores whether these materials can effectively replace CTZ in clinical practice.
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Dental Article 🔽 CTZ Paste in Primary Teeth Pulp Therapy: Indications, Benefits and Clinical Protocol ... The use of CTZ paste (Chloramphenicol–Tetracycline–Zinc Oxide) in primary teeth remains a topic of interest, especially in cases of infected primary molars where traditional pulpectomy is not feasible.✅ Material Composition and Mechanism of Action
CTZ Paste
▪️ Components: Chloramphenicol, tetracycline, zinc oxide-eugenol
▪️ Mechanism: Broad-spectrum antibacterial effect via protein synthesis inhibition
▪️ Limitation: Potential systemic toxicity and antibiotic resistance
Iodoform-Calcium Hydroxide Pastes
▪️ Components: Calcium hydroxide, iodoform, silicone oil (vehicle)
▪️ Mechanism:
₀ High pH (≈12.5) → antimicrobial activity
₀ Iodoform → sustained antiseptic effect
▪️ Advantage: Promotes periapical healing and physiological root resorption
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Iodoform-calcium hydroxide pastes are indicated for:
▪️ Pulpectomy in primary teeth
▪️ Teeth with periapical lesions
▪️ Cases requiring resorbable obturation materials
CTZ is typically used in:
▪️ Non-instrumentation endodontic techniques
▪️ Situations with limited clinical time or patient cooperation
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▪️ Superior biocompatibility compared to antibiotic-based pastes
▪️ Resorbability synchronized with primary root resorption
▪️ Reduced risk of systemic adverse effects
▪️ Lower contribution to antimicrobial resistance
▪️ Radiopacity and ease of placement
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Dental Article 🔽 Triple Antibiotic Paste (TAP) in Pediatric Endodontics: Current Clinical Evidence ... Triple Antibiotic Paste (TAP) has gained significant attention in pediatric endodontics, particularly in the management of necrotic primary teeth and immature permanent teeth.✅ Risks and Limitations
▪️ Potential over-resorption before complete root resorption
▪️ Lower immediate antibacterial potency compared to CTZ
▪️ Risk of extrusion beyond apex, although generally well tolerated
▪️ Possible discoloration due to iodoform content
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The replacement of CTZ with iodoform-calcium hydroxide pastes reflects a broader shift toward biologically acceptable and antibiotic-free materials. Although CTZ demonstrates strong antimicrobial efficacy, its reliance on broad-spectrum antibiotics is increasingly problematic in modern clinical practice.
Evidence suggests that calcium hydroxide-based pastes provide adequate disinfection while supporting tissue repair and regeneration. However, their clinical success depends on proper case selection and technique, especially in teeth with extensive infection.
Furthermore, the resorbable nature of iodoform-calcium hydroxide pastes aligns well with the physiology of primary dentition, reducing the risk of interference with permanent tooth eruption.
✍️ Conclusion
Iodoform-calcium hydroxide pastes represent a viable and safer alternative to CTZ, particularly in pediatric patients. Although they may exhibit slightly reduced immediate antibacterial activity, their superior biocompatibility, physiological resorbability, and lower systemic risk profile support their preference in most clinical scenarios.
🎯 Clinical Recommendations
▪️ Prefer iodoform-calcium hydroxide pastes in routine pulpectomies
▪️ Reserve CTZ for specific cases where rapid disinfection is critical
▪️ Avoid CTZ in patients with antibiotic sensitivity or systemic risk factors
▪️ Ensure accurate obturation technique to prevent extrusion
▪️ Monitor treated teeth radiographically for resorption patterns
| Parameter | Iodoform-Calcium Hydroxide Pastes | CTZ Paste |
|---|---|---|
| Composition | Calcium hydroxide + iodoform | Chloramphenicol + tetracycline + ZOE |
| Antimicrobial Action | High pH + antiseptic effect | Broad-spectrum antibiotic effect |
| Biocompatibility | High | Moderate to low |
| Resorbability | Physiological, synchronized with roots | Limited or unpredictable |
| Systemic Risk | Low | Higher (antibiotic-related) |
| Clinical Indication | Pulpectomy in primary teeth | Non-instrumentation techniques |
📚 References
✔ American Academy of Pediatric Dentistry. (2023). Guideline on pulp therapy for primary and immature permanent teeth. Pediatric Dentistry, 45(6), 384–392.
✔ Coll, J. A., Vargas, K., Marghalani, A. A., Chen, C. Y., & AlShamali, S. (2020). A systematic review and meta-analysis of nonvital pulp therapy for primary teeth. Pediatric Dentistry, 42(4), 256–261.
✔ Siqueira, J. F., & Rôças, I. N. (2019). Present status and future directions in endodontic microbiology. Endodontic Topics, 38(1), 3–23. https://doi.org/10.1111/etp.12264
✔ Subramaniam, P., Konde, S., Mandanna, D. K. (2011). Clinical and radiographic evaluation of metapex in pulpectomy of primary teeth. Journal of Indian Society of Pedodontics and Preventive Dentistry, 29(3), 233–238. https://doi.org/10.4103/0970-4388.85818
✔ Trairatvorakul, C., & Chunlasikaiwan, S. (2008). Success of pulpectomy with zinc oxide-eugenol vs iodoform paste in primary molars: A clinical study. International Journal of Paediatric Dentistry, 18(3), 169–177. https://doi.org/10.1111/j.1365-263X.2007.00914.x
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