COMPARISON OF STRESS DISTRIBUTION OF WAVE ONE AND RECIPROC INSTRUMENTS USING A FINITE ELEMENT ANALYSIS

Objective: The aim of this study was to compare and evaluate the stress distribution of two different reciprocating systems (Reciproc R25 and WaveOne Primary) with different cross-sectional geometries under bending or torsional conditions using a finite element model. Materials and Methods: Size # 25.08 of two different NiTi instruments was selected for the study. 3-D finite element models were constructed for each file and mechanical behavior of these files were compared under bending (1 N and 2 mm) and torsional (2.5 Nmm and 10°) conditions. Results: Under 1 N bending load, both instruments showed similar mechanical behavior. When a 2 mm deflection applied, Reciproc R25 was more flexible. Torsional tests revealed that WaveOne had lower stress concentrations at 10° rotation. When the angle of rotation increased, Reciproc R25 had lower stress concentration. Conclusion: WaveOne Primary showed comparable flexibility to Reciproc R25 under high bending loads and low torsional forces.