Objective: To evaluate and to compare in vitro the cyclic fatigue resistance of three NiTI single-file systems (One Shape, Reciproc and Wave One) after immersion in 10% EDTA solution over different time periods. Materials and Methods: Cyclic fatigue test of three NiTi single-file systems was performed in a curved stainless steel artificial canal with 60° angle and 5 mm radius of curvature. 45 OneShape, 45 Reciproc R25 and 45 WaveOne Primary were tested after three different immersion protocols: 1 min in 10% EDTA at 37°C, 5 min in 10% EDTA at 37°C, no immersion. The number of cycles to fracture (NCF) was determined by measuring the time to fracture. The data were compared for differences by using 2-way analysis of variance (P=0.05). Results: In general, resistance to cyclic fatigue was not significantly affected by immersion in 10% EDTA. Reciproc R25 showed the highest cyclic fatigue resistance in all groups. Conclusions: 10% EDTA did not decrease/increase the cyclic fatigue resistance of NiTI single-file systems appreciably in vitro. Reciproc R25 was more resistant, but the new rotary OneShape instruments showed good mechanical resistance, similar to WaveOne Primary files developed for reciprocating motion.

Cyclic Fatigue Resistance of Three Niti Single-File Systems after Immersion in EDTA

DAGNA, ALBERTO;POGGIO, CLAUDIO;BELTRAMI, RICCARDO;CHIESA, MARCO;BIANCHI, STEFANO
2013

Abstract

Objective: To evaluate and to compare in vitro the cyclic fatigue resistance of three NiTI single-file systems (One Shape, Reciproc and Wave One) after immersion in 10% EDTA solution over different time periods. Materials and Methods: Cyclic fatigue test of three NiTi single-file systems was performed in a curved stainless steel artificial canal with 60° angle and 5 mm radius of curvature. 45 OneShape, 45 Reciproc R25 and 45 WaveOne Primary were tested after three different immersion protocols: 1 min in 10% EDTA at 37°C, 5 min in 10% EDTA at 37°C, no immersion. The number of cycles to fracture (NCF) was determined by measuring the time to fracture. The data were compared for differences by using 2-way analysis of variance (P=0.05). Results: In general, resistance to cyclic fatigue was not significantly affected by immersion in 10% EDTA. Reciproc R25 showed the highest cyclic fatigue resistance in all groups. Conclusions: 10% EDTA did not decrease/increase the cyclic fatigue resistance of NiTI single-file systems appreciably in vitro. Reciproc R25 was more resistant, but the new rotary OneShape instruments showed good mechanical resistance, similar to WaveOne Primary files developed for reciprocating motion.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/885034
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