Lateral root perforation remains one of the more challenging complications in endodontic retreatment. When it occurs in a mandibular first molar—especially in the mesiobuccal canal—the clinician must address both the perforation itself and the critical need to re-establish the original root canal pathway.
This advanced retreatment case, shared by Dr. Ahmed Salim, illustrates a practical, systematic approach to managing a lateral root perforation while prioritizing anatomical restoration over simple obstacle removal.
Case Overview
The patient presented with a previously treated mandibular first molar showing a lateral root perforation in the mesiobuccal canal. Residual gutta-percha filled the canal system, and the perforation created a pathway deviation that compromised both cleaning and sealing.
The dual clinical goals were clear:
- Effectively seal the perforation
- Re-establish and follow the original canal pathway to the apex
Step-by-Step Management
1. Removal of Old Gutta-Percha
Old obturation material was carefully removed using Rogin Retreatment Files. These files are designed for efficient, controlled retrieval of gutta-percha while minimizing risk of further canal transportation or additional perforation.
2. Ultrasonic Troughing and Bypassing the Perforation
After gutta-percha removal, ultrasonic troughing was performed to improve visibility and access around the perforation site. Pre-bent hand files were then used to carefully bypass the perforated area and re-enter the original canal trajectory. This step is essential—successful management of lateral root perforation depends on locating and negotiating the true pathway rather than simply packing the defect.
3. Canal Shaping with Rogin Files and TCA Technique
Once the original pathway was re-established, canal shaping was completed using Rogin Files in combination with the TCA (Tapered Canal Approach or similar controlled-taper technique) method. This allowed progressive, conservative enlargement while maintaining the natural canal anatomy that had been restored.
4. Obturation Using the Sandwich Technique with Bioceramic Materials
Final obturation employed a Sandwich Technique utilizing bioceramic materials. This approach provides a reliable seal of both the main canal system and the perforation site, combining the flow and sealing properties of bioceramics with layered placement for enhanced adaptation and long-term stability.
Key Clinical Insight
Successful endodontic retreatment in cases of lateral root perforation is not primarily about eliminating obstacles. It is about restoring the original pathway. When the true canal anatomy can be reclaimed, subsequent cleaning, shaping, and sealing become far more predictable, improving the overall prognosis of the tooth.
Clinical Takeaways
- Early identification and careful bypass of the perforation preserve remaining tooth structure.
- Specialized retreatment files and controlled ultrasonic work reduce iatrogenic risks.
- Combining pathway restoration with modern bioceramic sandwich obturation offers a robust seal in complex anatomy.
- Documentation and sharing of such cases help the endodontic community refine techniques for similar presentations.
This case demonstrates that even when a lateral root perforation has occurred, a disciplined, anatomy-focused approach can still return the canal system to a functional, sealable state.
