Severe root canal curvature presents a significant challenge in endodontic treatment. Pronounced bends increase the risk of instrument separation, canal transportation, and incomplete cleaning, making flexible instrumentation and precise length control essential. This clinical case, performed by Dr. Radwan Alnabelsi in Bahrain, demonstrates a successful root canal treatment of a mandibular second molar (#37) diagnosed with symptomatic irreversible pulpitis and featuring severely curved root canals.
Case Difficulty
Advanced – Severely curved root canals requiring careful negotiation and preservation of the original canal anatomy.
Case Details
- Tooth: Lower second molar (#37)
- Diagnosis: Symptomatic irreversible pulpitis (SIP)
- Challenge: Management of severe root canal curvature while achieving safe preparation and thorough cleaning.
Clinical Workflow
1. Working Length Determination
Working length was established using the AirPex electronic apex locator. Accurate length determination is critical in severely curved canals to avoid over-instrumentation and to guide controlled preparation through the bends.
2. Mechanical Preparation
Canal shaping was performed with ROGIN EZ SHAPER heat-treated nickel-titanium files. The enhanced flexibility of these heat-treated files facilitates safer negotiation of severe curvatures, reducing the risk of straightening the canal or creating ledges.
3. Irrigation Protocol
A sequential irrigation regimen was applied:
- Sodium hypochlorite for tissue dissolution and disinfection
- Saline
- EDTA for smear layer removal
- Final saline rinse
4. Activation
Passive ultrasonic activation was performed with the Ultra-X device. In highly curved canals, ultrasonic activation improves irrigant penetration into areas that mechanical instruments may not fully reach.
Clinical Tips for Managing Severely Curved Root Canals
- Establish and verify working length with a reliable apex locator such as AirPex throughout the procedure.
- Select heat-treated files like ROGIN EZ SHAPER for their superior flexibility when preparing severely curved canals.
- Follow a systematic irrigation sequence (sodium hypochlorite → saline → EDTA → saline) to support effective cleaning.
- Incorporate passive ultrasonic activation (Ultra-X) to enhance irrigant performance in complex curved anatomy.
Key Takeaways
Successful treatment of severely curved canals relies on precise working length control, flexible heat-treated instrumentation, and activated irrigation. This case by Dr. Radwan Alnabelsi illustrates how a structured approach using modern heat-treated NiTi files and ultrasonic activation can help achieve predictable outcomes even in advanced anatomical situations.
Respect for the original canal path, careful instrument selection, and thorough irrigation remain fundamental when managing teeth with significant root curvature.
