Aim: The aim of this study was to compare Protaper Universal retreatment files, M-Pro, and
Twisted files in retreatment.
Methodology: Experimental groups were divided into three group; Group I: Protaper Universal
Retreatment (PTU; Dentsply Maillefer, Ballaigues, Switzerland), Group II: M-Pro (Innovative
Material and Devices, ShangHai, China), and Group III: Twisted File (TF; SybronEndo, Orange,
CA). Each group was evaluated for time to reach the working length, amount of debris extruded
during retreatment. Data were then collected, tabulated and statistically analyzed.
Results: Statistical analysis showed that TF recorded the least time to reach the working length,
while M-Pro showed the highest amount of debris extruded.
Conclusion: Under the condition of the current study, TF was faster than M-Pro and PTU to
perform gutta-percha removal in the retreatment of teeth. The use of M-Pro in retreatment increased
the amount of apically extruded debris.