Abstract
The purpose of this study was to determine the efficiency of Greater Taper, ProTaper & RaCe rotary instruments compared with Hedstrom files for removal of guttapercha from root canal during retreatment following an endodontic failure. 60 mandibular premolars were divided into 4 groups, each group consisting of 15 teeth. Group 1: Hedstrom files; Group 2: Greater Taper rotary (GT); Group 3: ProTaper; Group 4: with Reamer with alternate cutting edges (Race). The teeth were instrumented with K- type files and filled using lateral condensation technique with guttapercha and AH plus sealer. After repreparation with Gates Glidden drills and the test instruments the teeth were cleared. The area of remaining guttapercha/sealer on the root canal wall was measured from mesio-distal and bucco-lingual directions. The RaCe group showed significantly less obturation material than System GT, ProTaper and H-files (p<0.001). There was no significant difference between System GT and ProTaper in removing guttapercha/sealer. RaCe took the least time for removing guttapercha/sealer (p<0.05). One ProTaper files and one H-file separated. The study demonstrated that, RaCe NiTi rotary instruments cleaned the root canals after retreatment more efficiently than ProTaper, System GT and H-files.
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