Fig. 1

Preoperative radiograph with evidence of periapical and furcation pathosis, short obturation , calsified M canals

Fig. 2

Four independent canals were located, each leading to its own apical foramen. Gutta-percha was retrieved from the canals with the help of Re-treat rotary file system . During treatment, a depression was felt in the pulp chamber floor toward the center of the mesial root canal entrance. The lip of dentin covering this area was removed with a long shank round bur. The distal root showed two canals with one independent foramina, which were connected at the cervical third and had a common orifice in the pulp chamber floor.

Fig. 3

The working length was determined radiographically and corroborated with an apex locator after using Zoning Technique with D-finder size 10 -25mm

Fig. 4

Last working length determined with the master finisher file

Fig. 5

Two weeks later, the patient returned for obturation of the canal. The tooth was asymptomatic, and following final irrigation with NaOCL 5.25% the canals were dried with paper points and deemed ready for obturation. A radiograph was taken to confirm the extension of the master cone to the estimated working length (figure 5.a). The tooth was then obturated with a worm vertical condensation technique using BC sealer (figure 5.b.c)

Fig. 6

Post-oparative radiograph showing the S curve in ML canal

Fig. 7

About Dr. Omar  Alsheikhly

Bachelor of dental surgery (BDS) Ivan Horbachevsky Ternopil State Medical University UKRAIN  2011-2016

Awarded the certificate of equivalency for the diploma Faculty of Dentistry \University of Baghdad IRAQ 2019

MSc master in advanced Endodontics University of Siena \ ITALY 2021\2023



The Zoning Technique represents a sophisticated and effective strategy in endodontics that optimizes root canal treatment by dividing the root canal system into distinct zones and addressing each zone's unique challenges with specific instruments and techniques. By incorporating the Zoning Technique into clinical practice, endodontists can achieve superior treatment outcomes, reduce the likelihood of procedural mishaps, and enhance the overall quality of endodontic therapy. Continued research and education in the field of endodontics are vital to further explore the potential and efficacy of the Zoning Technique in improving patient care and advancing the practice of root canal treatment.


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