Fig. 1

The Pre - Op Radiograph shows a Maxillary Molar DB ledge  & Short filling in all the roots.

Fig. 2

Five conservative highly effective instruments were used in sequence . 

BULLY

SKINNY 

SHAPY 1 ,2 & 3  

Fig. 3

POST - Op Radiograph

the ledge was bypassed successfully as well you can notice how conservative the retreatment was. 

Clinical video of the procedure

Conclusions

The Clinician must have a knowledge about files , kinematics & metallurgy and to choose the best set for every situation , RE-TREATY kit presents an excellent option for every day rettt situations

Bibliography

Baruwa AO, Martins JNR, Meirinhos J, Pereira B, Gouveia J, Quaresma SA, Monroe A, Ginjeira A. The Influence of Missed Canals on the Prevalence of Periapical Lesions in Endodontically Treated Teeth: A Cross-sectional Study. J Endod. 2020 Jan;46(1):34-39.e1. doi: 10.1016/j.joen.2019.10.007. Epub 2019 Nov 14. Erratum in: J Endod. 2020 Jun;46(6):881. PMID: 31733814.
Karabucak B, Bunes A, Chehoud C, Kohli MR, Setzer F. Prevalence of Apical Periodontitis in Endodontically Treated Premolars and Molars with Untreated Canal: A Cone-beam Computed Tomography Study. J Endod. 2016 Apr;42(4):538-41. doi: 10.1016/j.joen.2015.12.026. Epub 2016 Feb 10. PMID: 26873567.