Cyclic Fatigue Resistance of TruNatomy and XP-Endo Rise Nickel-Titanium Rotary Instruments: An In-Vitro Study | ||
| Ain Shams Dental Journal | ||
| Volume 38, Issue 2, June 2025, Pages 800-807 PDF (1.1 M) | ||
| Document Type: Original articles | ||
| DOI: 10.21608/asdj.2025.434895.2456 | ||
| Authors | ||
| Mohamed Nabeel Ahmed Hashem* 1; Rasha Sameh2; Mohamed M.N. El-Tayeb3 | ||
| 1Endodontic department, faculty of oral and dental medicine, Misr international university | ||
| 2Endodontic department, October 6 University, Cairo, Egypt | ||
| 3Department of Endodontics, Faculty of Oral and Dental Medicine, Badr University in Cairo, Cairo, Egypt | ||
| Abstract | ||
| Aim: To compare the cyclic fatigue resistance (CFR) of TruNatomy (Dentsply Sirona) and XP-Endo Rise (FKG Dentaire) rotary nickel-titanium (NiTi) instruments under static and dynamic conditions at body temperature. Materials and methods: Forty new NiTi rotary files were tested: 20 TruNatomy Prime (26/.04) and 20 XP-Endo Rise (25/.04). Tests were performed in artificial stainless-steel canals (60° curvature, 5-mm radius). The canals were submerged in distilled water maintained at 37 ± 1°C to simulate intracanal temperature. Each instrument was rotated using a torque-controlled motor according to manufacturer recommendations: TruNatomy at 500 rpm, 1.5 Ncm; XP-Endo Rise at 800 rpm, 1 Ncm. Time to fracture (s) was recorded, and the number of cycles to fracture (NCF) was calculated as: NCF = (rpm x fracture) / 60 Fracture fragments were measured under a stereomicroscope, and selected samples examined under scanning electron microscopy (SEM) to confirm fatigue characteristics. Data were analyzed using Student’s t-test (p < 0.05). Results: Mean ± SD NCF values were; XP-Endo Rise: 1423 ± 210 cycles & TruNatomy Prime: 1095 ± 186 cycles. XP-Endo Rise demonstrated significantly higher cyclic fatigue resistance (p = 0.002). Fracture occurred at 3.1 ± 0.3 mm from the tip for TruNatomy and 2.9 ± 0.4 mm for XP-Endo Rise. SEM analysis revealed typical ductile fatigue striations and crack initiation zones in both groups, with smoother fracture surfaces in XP-Endo Rise files. Conclusion: XP-Endo Rise exhibited greater cyclic fatigue resistance than TruNatomy under the tested conditions, likely due to its proprietary MaxWire alloy and design flexibility at body temperature. Both systems, however, showed high CFR suitable for clinical use in curved canals. | ||
| Keywords | ||
| cyclic fatigue; XP-Endo Rise; TruNatomy; nickel-titanium; rotary instruments | ||
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