Evaluation of the efficacy of Protaper, HERO SHAPER GOLD, ProTaper Universal retreatment, and R-Endo, for removing gutta-percha and AH plus sealer from root canals

The purpose of the present study is to evaluate the efficacy of four different rotary NiTi files ProTaper files, HERO SHAPER GOLD files, ProTaper Universal retreatment files, and R-Endo files to remove GP and sealer from root canals with or without the use of passive ultrasonic irrigation using Irrisafe file under DOMS. This study hypothesizes that using PUI could result in better cleanliness of root canals after instrumentation for removal of GP and sealer. The study samples comprised 100 extracted single-rooted human maxillary anterior teeth and were collected from the Department of Oral and Maxillofacial Surgery, G. Pulla Reddy Dental College & Hospital, Kurnool. The t Test shows that there was a statistically significant difference between individual Sub groups of Groups I,II & IV (p<0.05). No statistically significant difference between Subgroups of Group III (p>0.05) but with percentage of remaining GP and sealer in the root canals after retreatment was comparatively greater in Subgroup A than in Sub group B. Under the experimental conditions, all the retreatment files left some amount of GP and sealer in the root canals and there was no significant difference between them. However, R- Endo is better following ProTaper Universal retreatment system proved, Protaper files, and HERO SHAPER GOLD files. Further use of passive ultrasonic irrigation with an Irrisafe file resulted in better cleanliness of the root canal wall after retreatment.