A comparative study between hand and rotary protaper instruments on natural extracted teeth

Abstract

Background: The purpose of this in-vitro study was to evaluate and compare the changes in working length and preparation time after instrumentation with hand and rotary protaper endodontic instruments. Materials and Methods: mesial canals of thirty human mandibular first molars were used in this study. The mesial canals were prepared alternatively till size F2 using crown-down technique with hand protaper files (group Ι) and rotary protaper files (group ΙΙ). Following parameters were evaluated; changes in working length and preparation time. Results: The results showed that all canals got loss of working length after instrumentation with hand and rotary protaper files, but the difference was insignificant between them. The instrumentation time was shorter for rotary than for hand protaper instruments. Conclusions: The preparation time with rotary protaper was faster than with hand protaper, and there in no differences between them in working length changes