An In vitro comparative evaluation of a hand file and three rotary Nill Instruments for removing gutta percha during root canal re-treatmen

An In vitro comparative evaluation of a hand file and three rotary Nill Instruments for removing gutta percha during root canal re-treatmen

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Objective: To evaluate the efficacy of NITI mechanical rotary instrumentation and Hedstrom file for gutta percha removal using dearing technique.Method: Forty extracted human single rooted premolar, each with a single canal were selected.The samples were decoronated to leave 17 mm root and Instrumented with K-flles upto MAF 30 using step back technique.

Samples were obturated using cold lateral condensation of gutta-perdta and AH Plus sealer.The teeth Chassis Accessory Products were then randomly divided Into four groups of 10 specimens each.After 2 weeks all the canals were then retreated by either ProTaper re-treatment files, M--two re-treatment files, R-Endo re-treatment flies or Hedstrom flies.

The amount of remaining filling materials after re-treatment procedures was assessed by stereomlcroscope.Also time required for reaching original working length and for removal of obturating material (in min) was measured.Statistical analysis was accomplished using one way Kruskal-Wallls ANOVA and Mann-Whitney U test.

Result: M-two re-treatment flies showed least amount of gutta perdta/sealer Tapas (chilled) followed by Pro Taper re-treatment files, R-Endo re-treatment flies and Hedstrom files.Conclusion: Under the experimental conditions, significant difference was observed between Pro Taper re-treatment flies&.Hedstrom flies and Mtwo re-treatment flies&.

Hedstrom flies for gutta percha/sealer removal.Complete removal of materials did not occur with any of the instrument systems investigated.