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Year : 2017  |  Volume : 29  |  Issue : 1  |  Page : 60-64

Comparison of efficacy of hand and rotary instrumentation for removing a resin-based obturating material (EndoRez) in curved root canals during retreatment: An in vitro study

1 Private Practitioner, Al Hilal Hospital, Bahrain
2 Department of Conservative Dentistry and Endodontics, I.T.S Centre for Dental Studies and Research, Ghaziabad, Uttar Pradesh, India

Correspondence Address:
Sonali Taneja
Department of Conservative Dentistry and Endodontics, ITS-CDSR, Muradnagar, Ghaziabad - 201 206, Uttar Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/endo.endo_12_17

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Aim: This study aims to evaluate and compare the efficacy of three rotary NiTi (ProTaper UR, R-Endo, and MTwo R) and one manual (Hedstrom file) instrument in the removal of a resin-based root canal obturation material (EndoRez) during root canal retreatment of curved root canals by area and volumetric analysis. Methodology: Forty single-rooted curved (10°–30°) human mandibular premolars were decoronated to obtain a standardized working length. The canals were prepared using hand ProTaper instruments and obturated using EndoRez sealer and EndoRez Gutta-percha points. Pretreatment volume analysis of the obturation material was carried out using cone beam computed tomography (CBCT). Samples were divided into four groups (n = 10): Group I - Hedstrom files, Group II - ProTaper UR files, Group III - R-Endo files, and Group IV - MTwo R files. Total time required to attain the working length (T1) and complete removal of material with the last instrument used (T2) was recorded in seconds. Area and volume fractions of remaining filling were calculated in percentage using AUTOCAD 2000 software and CBCT. Statistical Analysis Used: The results were statistically analyzed using analysis of variance and post hoc tests (Tukey-HSD). Results: H-files took maximum amount of time for the entire retreatment procedure followed by ProTaper UR, R-Endo, and MTwo R with statistically significant difference. ProTaper UR files showed maximum cleaning efficiency (both in terms of area and volume of the remaining filling material) followed by R-Endo, MTwo R, and H-files with statistically significant difference. Conclusion: NiTi rotary instruments showed superior performance than hand instruments during retreatment.

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