A  COMPARATIVE EVALUATION OF CYCLIC FATIGUE RESISTANCE OF DIFFERENT CONTINUOUS ROTATION AND RECIPROCATING FILE SYSTEMS

Suparna Ganguly Saha; Ankita Grace Lall; Anuj Bhardwaj; Harmeet Singh Sachdeva; Prashansa Vijaywargiya; S.V.Sai Prasad

Suparna Ganguly Saha College of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India
Ankita Grace Lall College of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India
Anuj Bhardwaj College of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India
Harmeet Singh Sachdeva College of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India
Prashansa Vijaywargiya College of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India
S.V.Sai Prasad College of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India

Keywords: Angle of curvature, cyclic fatigue resistance, nickel-titanium

Abstract

AIM AND OBJECTIVE: The aim of this in-vitro study was to compare the cyclic fatigue resistance of two continuous rotation file systems (HyFlex EDM and TwoShape) and two reciprocating file systems (Reciproc Blue and WaveOne Gold) in canals with different angulations.
Materials and Method: Thirty files each of HyFlex EDM (25,~), TwoShape (25,0.06), Reciproc Blue R25 (25/0.08) and WaveOne Gold Primary (25/0.07) were included in this study. All the instruments were used according to manufacturers' instructions in an endodontic fatigue testing block with three artificial grooves simulating root canals having angulations of 45°, 60° and 90°. The files were allowed to rotate in the grooves, until fracture occurred and the time to fracture was recorded in seconds using digital chronometer. The data were analyzed statistically using one-way ANOVA followed by Post hoc Tukey test .

Results: Amongst the continuous rotation file systems, Hyflex EDM while amongst the reciprocating file systems Reciproc Blue showed significantly higher cyclic fatigue resistance at all angles of curvature i.e. 45°, 60° and 90° (p <0.05). On comparing all the four file systems, Hyflex EDM at 45° angle of curvature whereas Reciproc Blue at 60° and 90° angles of curvature presented with highest cyclic fatigue resistance (p <0.05).

Conclusions: Within the limitations of the present in vitro study, it may be concluded that HyFlex EDM tends to be more resistant to fracture in canals with a gentle curvature, while Reciproc Blue may be more suited in canals with sharp and acute curvatures.