Abstract

Background. This study aimed to compare the VDW.ROTATE instruments with the Reciproc Blue instruments in different kinematics in terms of the cyclic fatigue resistance. Methods. Sixty instruments, 40 VDW.ROTATE and 20 Reciproc Blue instruments, were divided into three groups (n=20): VDW.ROTATE was used in both continuous rotation and reciprocation, and Reciproc Blue was used in reciprocation only. The cyclic fatigue resistance test was carried out in an artificial canal (60°, r=3 mm) at an intracanal temperature of 35±2°C until fracture, and the time to fracture was recorded in seconds. The data were analyzed statistically using Kruskal–Wallis and Tamhane’s T2 tests (P<0.05). Results. DAll the reciprocating motion groups resulted in a longer mean duration to failure than the continuous rotation motion group (P<0.05). Conclusion. It was observed that the Reciproc Blue instruments had higher cyclic fatigue resistance than VDW.ROTATE instruments (P<0.05). Recent studies have shown that reciprocal movement increases cyclic fatigue resistance compared to rotational movement. The VDW.ROTATE instrument, which has a similar size, design, and alloy as the Reciproc Blue instrument, can also be used by clinicians in reciprocating motion with endo motors capable of reciprocating in different directions. However, even if the cyclic fatigue resistance increases by using VDW.ROTATE instruments in reciprocation, the cyclic fatigue resistance is lower than Reciproc Blue instruments.

Highlights

  • Nickel‒Titanium (NiTi) instruments with superelasticity and shape memory have been preferred by clinicians, especially in the preparation of curved root canals since their first use by Walia et al[1] in 1988

  • Statistical analysis revealed that Reciproc Blue instruments exhibited significantly better resistance than the VDW.ROTATE groups in the artificial stainless steel canal used in this study (P

  • Statistical analysis showed that when the VDW.ROTATE instruments were used in reciprocal motion, the fracture resistance increased compared to the rotation motion (P

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Summary

Introduction

Nickel‒Titanium (NiTi) instruments with superelasticity and shape memory have been preferred by clinicians, especially in the preparation of curved root canals since their first use by Walia et al[1] in 1988. The system has a blue titanium oxide layer on its surface, with increased flexibility and cyclic fatigue resistance.[5,6] The VDW.ROTATE system (VDW, Munich, Germany), a multi-instrument system, is manufactured by VDW. This innovative system offers a wide range of instruments for different clinical cases: (15/.04), (20/.05), (25/.04), (25/.06), (30/.04), (35/.04), (40/.04), (50/.04), (60/.04), (30/.06), (35/.06), and (40/.06). These instrument systems perform cutting by rotating in different directions

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