- Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi
- Vol: 31 Issue: 3
- IN VITRO COMPARISON OF CYCLIC FATIGUE RESISTANCE OF PROTAPER NEXT AND TRUSHAPE 3D CONFORMING FILE NI...
IN VITRO COMPARISON OF CYCLIC FATIGUE RESISTANCE OF PROTAPER NEXT AND TRUSHAPE 3D CONFORMING FILE NICKEL-TITANIUM ROTARY INSTRUMENTS
Authors : Ahmet Demirhan Uygun, Mehmet Ünal, Mehmet Sinan Evcil, Halit Aladağ
Pages : 385-389
Doi:10.17567/ataunidfd.831765
View : 24 | Download : 6
Publication Date : 2021-07-14
Article Type : Research
Abstract :Abstract Aim: The purpose of this study was to compare the cyclic fatigue resistance of all instruments of the ProTaper Next (PTN) and TRUShape 3D Conforming File (TRS) systems. Materials and Methods: A total of 120 nickel–titanium rotary instruments were divided into eight groups: PTN X1, PTN X2, PTN X3, PTN X4, TRS 20/.06v, TRS 25/.06v, TRS 30/.06v and TRS 40/.06v. Each group had 15 instruments. All the instruments were tested for cyclic fatigue resistance in stainless steel artificial canals with 5 mm radius and 60° angle of curvature. They were rotated until they got fractured, and the test was performed in a saline solution at 35°C (±2). The number of cycles to fracture (NCF) was calculated by measuring the time to fracture. The NCF data were analysed statistically using the Kruskal–Wallis H and post hoc Tamhane T2 tests for multiple comparisons (α-level = 0.05). Results: The PTN X1 group had the highest NCF (P < 0.05). There was no statistically significant difference between the X2 and TRS 25/.06 groups (P > 0.05). However, there was a statistical difference between the other groups of similar sizes (X1–TRS 20/.06v) (X3–TRS 30/.06v) (X4–TRS 40/.06v) (P < 0.05). Conclusion: Within the limitations of this study, most of the PTN instruments (X1, X3, and X4) have better cyclic fatigue resistance than do TRS instruments (20/.06, 30/.06 and 40/.06) even if they were manufactured with older technology. This result showed that the S-curve design increases the risk of fracture in instruments with large tapers and tip sizes. Keywords: cyclic fatigue resistance, S-curve design, TRUShapeKeywords : cyclic fatigue resistance, S-curve design