Clinical ResearchInstrument Separation Analysis of Multi-used ProTaper Universal Rotary System during Root Canal Therapy
Section snippets
ProTaper Universal File Instrumentation
Canal preparation was performed by the ProTaper Universal Series Rotary System according to the manufacturer’s recommendations using a crown-down technique. First, a gliding path was created using a #10 hand file to the working length. Second, an SX file was fed into the canal with a brushing outstroke motion for two thirds of its blade length. Third, a #15 hand file was passively used to reach the working length. Then, S1/S2 files were used with a brushing outstroke action until the working
Instrument Separation in Different ProTaper Universal Files
Overall, there were a total of 70 ProTaper Universal instrument separations (2 for SX, 16 for S1, 10 for S2, 11 for F1, 20 for F2, and 11 for F3, respectively) after 6,154 root canal treatments of 2,654 teeth. The overall prevalence of file separation was 2.6% according to the number of teeth and 1.1% according to the canal number, respectively. The F3 file showed the highest incidence of instrument separation (1.0% according to the number of teeth and 0.4% according to canal number), whereas
Discussion
The evaluation methods and results for the separation incidences of ProTaper rotary files are diverse in previous clinical studies. Wolcott et al (23) have shown that the overall rate of instrument separation was 2.4%. Another study has used 15 severely curved molars to assess the separation incidence of the ProTaper system with a 6.0% failure rate (24). Variations among these results may be attributed to the different clinical assessment approaches. For instance, all tooth types are involved
Acknowledgments
The authors deny any conflicts of interest related to this study.
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