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.
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✅ Introduction
The CTZ technique, also known as Lesion Sterilization and Tissue Repair (LSTR), aims to disinfect infected primary teeth by using a topical antibiotic mixture sealed within the pulp chamber. Unlike full pulpectomy, this approach promotes infection control without extensive instrumentation, making it useful in pediatric patients with limited cooperation.
However, concerns regarding antibiotic resistance, systemic absorption, and use of chloramphenicol and tetracycline in children have prompted ongoing debate. Updated guidelines emphasize strict case selection and avoidance of CTZ when safer alternatives (e.g., Vitapex, Ca(OH)₂–iodoform pastes) are available.
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CTZ paste typically contains:
▪️ Chloramphenicol (250 mg)
▪️ Tetracycline (250 mg)
▪️ Zinc oxide
▪️ Eugenol or propylene glycol as vehicle
Some variations replace tetracycline with metronidazole or eliminate eugenol.
✅ Mechanism of Action
▪️ Broad-spectrum antibacterial effect against anaerobic and facultative bacteria involved in primary tooth infections.
▪️ Promotes partial tissue repair through reduction of bacterial load.
▪️ Works without canal instrumentation, relying on diffusion through dentinal tubules.
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CTZ paste is indicated when:
▪️ The child cannot tolerate conventional pulpectomy.
▪️ Canals are severely obstructed, resorbed, or inaccessible.
▪️ There is chronic infection, fistula, or abscess associated with a restorable tooth.
▪️ Treatment aims to maintain the primary tooth short-term until natural exfoliation or eruption of the successor.
✅ Contraindications
▪️ Children with allergy to chloramphenicol, tetracycline, or eugenol.
▪️ When the tooth is non-restorable.
▪️ Presence of advanced pathological resorption or mobile tooth near exfoliation.
▪️ Patients with systemic conditions requiring antibiotic stewardship.
▪️ When the tooth can receive conventional pulpectomy.
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1. Local anesthesia and isolation.
2. Removal of coronal pulp and carious tissue.
3. Irrigation with saline or chlorhexidine (no instrumentation of canals).
4. Placement of a thin layer of CTZ paste on chamber floor.
5. Seal with reinforced glass ionomer cement.
6. Final restoration with stainless steel crown, whenever possible.
✅ Benefits
▪️ Requires minimal cooperation, ideal for uncooperative children.
▪️ Effective in reducing clinical signs of infection.
▪️ Faster than pulpectomy.
▪️ Useful in public health settings or emergency care.
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▪️ Potential risk of antibiotic resistance.
▪️ Chloramphenicol carries risk of systemic absorption (rare but serious).
▪️ Tetracycline may cause tooth discoloration when absorbed systemically.
▪️ Lower long-term success compared with proper pulpectomy techniques.
📊 Comparative Table: CTZ Paste vs Conventional Pulpectomy
| Aspect | Advantages | Limitations |
|---|---|---|
| CTZ Paste | Minimal instrumentation; fast; good for uncooperative children | Antibiotic exposure; lower long-term success; limited indications |
| Conventional Pulpectomy | Biocompatible materials; higher long-term success; well-documented evidence | Longer procedure; requires cooperation; technically demanding |
💬 Discussion
Although CTZ paste can be effective in selected cases, its use must be ethical and evidence-based. Current pediatric dentistry guidelines favor biocompatible materials (e.g., MTA, Biodentine, Vitapex, Ca(OH)₂) due to better long-term outcomes and absence of systemic antibiotic risks.
Nevertheless, CTZ paste remains a valuable alternative in:
▪️ Remote or resource-limited environments
▪️ Patients with behavioral management challenges
▪️ Complex anatomy preventing conventional therapy
The decision should always consider risk–benefit, parental counseling, and tooth prognosis.
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CTZ paste is an alternative pulp therapy for infected primary teeth when conventional treatment is not feasible. Its effectiveness relies on infection control, but concerns about antibiotic exposure and resistance require strict clinical judgment. When used appropriately, CTZ can help maintain primary teeth temporarily, supporting occlusal development until natural exfoliation.
🔎 Recommendations
▪️ Prefer standard pulpectomy when feasible.
▪️ Reserve CTZ for special circumstances and always inform parents about risks.
▪️ Follow-up radiographs every 3–6 months.
▪️ Always restore with full-coverage restoration.
▪️ Consider newer biocompatible pastes as first choice.
📚 References
✔ American Academy of Pediatric Dentistry. (2023). Pulp therapy for primary and immature permanent teeth. AAPD Clinical Guidelines.
✔ Bimstein, E., & Rotstein, I. (2019). Root canal treatment for children and adolescents. Springer Nature.
✔ Nakornchai, S., Banditsing, P., & Visetratana, N. (2020). Clinical evaluation of LSTR/CTZ therapy in primary teeth. International Journal of Paediatric Dentistry, 30(4), 500–507.
✔ Primosch, R., & Glomb, T. (2018). Vital pulp therapy in primary teeth: Current concepts. Pediatric Dentistry, 40(5), 315–322.
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