Cutting efficiency of different cross sectional design protaperrotary instruments - in-vitro study
Aim:The purpose of this study is to assess the effect of different cross sectional designs along with variable metallurgical modifications on the cutting efficiency of rotary nickel titanium on root canal dentine. Methodology: A total of forty mesiobuccal root canals in mesial roots of mandibular first permanent molars with a curvature ranging between 25o to 35oCwere selected for this study. Canals were randomly distributed into two groups, 20 canals were prepared with ProTaper GOLD rotary system, and the other 20 prepared with the ProTaper NEXT system. Teeth were marked and weighed before and after instrumentation with delta weight (Δ wt = wt pre – wt post) recorded and listed in tables for statistical analysis. Results: Samples instrumented with ProTaper GOLD showed increased weight loss (Δ wt) with no significant difference with the ProTaper NEXT. Conclusion: A cross section modification for the ProTaper NEXT didn’t improve the cutting efficiency as was expected; in addition metallurgical treatments of the Protaper GOLD showed good cutting efficiency.