Evaluation of Effectiveness of Two Different Retreatment Systems in Removal of Obturation Materials From Curved Canals: An in-Vitro Study

Introduction: The primary objective of endodontic retreatment is to remove the contamination of the root canals, thus facilitating the recovery of periapical tissues and allowing tissue healing. Aim of the study: The purpose of the present study was to evaluate the effectiveness of the two retreatment rotary systems Pro-Taper retreatment system and Neo-Endo retreatment system in the removal of obturating materials from curved canals. Materials and Methods: Forty (mesio-buccal) root canals of upper or lower molars were designated for the study and prepared using Pro-Taper Gold. Then canals were separated into two groups (A and B) based on the type of sealer. Twenty canals in group A were filled with (AH Plus sealer), whereas 20 canals in group B were filled using (Cera-Seal) bio-ceramic sealer. Each group was divided into two subgroups, subgroups (Ⅰ and Ⅱ) (n=10 for each) based on the retreatment method: Pro-Taper and Neo-Endo retreatment systems. Results: The analysis between groups revealed statistically significant difference exists between the two evaluated sealers, bio-ceramic sealers and AH Plus sealer. Higher value of obturating materials remnants was recorded in canals filled with AH plus and retreated by Neo-endo rotary system. While the lowest mean value was measured in canals filled with bio-ceramic sealer and reshaped using the Pro-Taper rotary system. Conclusion: Pro-Taper retreatment system is more efficient in removal of the obturating materials. AH plus remnants can be eliminated easily compared to Cera-Seal sealer.