Comparison of Time Required by D-RaCe, R-Endo and Mtwo Instruments for Retreatment: An in vitro Study

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Root canal retreatment is crucial for endodontic treatment success.
• Efficient gutta-percha removal is a key step in retreatment procedures.

Purpose of the Study:

• To compare the retreatment time of three rotary nickel-titanium (NiTi) instruments.
• To evaluate the efficiency of D-RaCe, Mtwo, and R-Endo systems in gutta-percha removal.
• To compare rotary systems with traditional hand files.

Main Methods:

• Eighty human mandibular premolars with single, straight root canals were used.
• Gutta-percha and AH Plus sealer were used for obturation.
• Teeth were divided into four groups: control (hand files) and three retreatment systems (D-RaCe, Mtwo, R-Endo).
• Retreatment time was recorded using a stopwatch.

Main Results:

• D-RaCe and Mtwo systems demonstrated significantly shorter retreatment times compared to R-Endo and hand files.
• Hand files required the maximum time for gutta-percha removal.
• No statistically significant difference was found between the retreatment times of D-RaCe and Mtwo.

Conclusions:

• Rotary NiTi instruments, specifically D-RaCe and Mtwo, offer a faster and more efficient method for gutta-percha removal during root canal retreatment.
• These systems provide a time-saving advantage over R-Endo and conventional hand files.