Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Background: The aim of this study was to comprehensively evaluate the cyclic fatigue strength of ProGlider, Edge Glide Path, and R-Pilot instruments.
Methods: Sixty-three instruments were submitted to a multimethod evaluation. Their design was analyzed by stereomicroscopy and scanning electron microscopy, including the number of blades, helical angle means, cross-sectional design, surface finishing, and symmetry. Energy-dispersive X-ray spectroscopy was used determine the nickel/titanium elements ratio, and differential scanning calorimetry determined the instruments' phase transformation temperatures. The cyclic fatigue tests were conducted in an artificial canal with a 6 mm radius and 86 degrees of curvature. The Mood's median test and one-way ANOVA were used to determine differences, with the significance level set at 0.05.
Results: The ProGlider presented the highest number of blades ( = 21), while R-Pilot had the highest helical angles (26.4°). Differences were noted in the instruments' cross-sections and surface finishing. The ProGlider and R-Pilot showed some similarities regarding the phase transformation temperatures but differed from the Edge Glide Path. All alloys showed an almost equiatomic nickel/titanium ratio. The R-Pilot instruments showed a significantly higher ( < 0.05) time to fracture than both the other files.
Conclusion: Reciprocating R-Pilot instruments showed a higher cyclic fatigue time to fracture than the ProGlider and Edge Glide Path rotary files.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8870709 | PMC |
| http://dx.doi.org/10.3390/dj10020030 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Two Million Cycle Fatigue Performance of Custom and Stock Conical-Hex Abutments: A Removal Torque and SEM Study.
Clin Implant Dent Relat Res
October 2025
Faculty of Dentistry, Department of Prosthodontics, Istanbul University, Istanbul, Turkey.
Introduction: Screw loosening remains a frequent mechanical complication in implant-supported prostheses, primarily caused by the gradual loss of abutment-screw preload. The aim of this study was to evaluate the mechanical performance of CAD-CAM custom and stock abutments by measuring removal torque values (RTV) at multiple time points and assessing surface morphology by scanning electron microscopy (SEM), following prolonged loading up to 2 × 10 cycles.
Methods: Forty-four implant-abutment assemblies with an internal conical-hex connection were divided into two groups: Stock abutments (SA) and custom abutments (CA).
Isolating design variables by assessing the impact of cross-section geometry on the mechanical performance of nickel-titanium rotary instruments: a comparative in vitro study.
Restor Dent Endod
August 2025
Department of Operative Dentistry, Endodontics, and Dental Materials, Bauru School of Dentistry, University of São Paulo - USP, Bauru, Brazil.
Objectives: This study aimed to assess the effect of cross-section geometry on the mechanical properties of nickel-titanium (NiTi) instruments by comparing two instruments with identical tip size, taper, and thermal treatment but differing in cross-section design.
Methods: One hundred four NiTi rotary instruments, being S-shaped and triangular cross-section, manufactured with Blueish thermal treatment, were tested (n = 52 per group). Differential scanning calorimetry was employed, and the metal mass volume and cross-section area were assessed.
Are endodontic nickel-titanium instruments indefectible? A fractographic analysis of a compound core manufacturing defect.
Eur J Oral Sci
August 2025
Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, Japan.
The aim of this study is to present a compound core manufacturing defect identified in a nickel-titanium (NiTi) instrument via fractographic analysis during additional retrospective analysis after dynamic cyclic fatigue resistance testing. This study raises awareness of core manufacturing defects and fosters the development of high-quality NiTi instruments without defects for clinical application. A scanning electron microscope with an acceleration voltage of 5 kV was used for fractographic analysis after cyclic fatigue testing.
View Article and Find Full Text PDFMechanical and structural changes to the annulus fibrosus in response to Sub-failure cyclic loading.
Acta Biomater
August 2025
Marquette University, Milwaukee, WI, USA; Medical College of Wisconsin, Milwaukee, WI, USA; Zablocki Veterans Affairs Medical Center, Milwaukee, WI, USA. Electronic address:
This study aimed to quantify how repetitive tensile loading alters the mechanical and structural properties of the annulus fibrosus (AF). Mechanical changes were evaluated through a three-step protocol involving pre-damage characterization of dynamic and viscoelastic properties, damage induction using predetermined loading cycles (n=400, 1600, 6400, 12,800) to a specified strain magnitude (11 %, 20 %, 28 %, 44 %), and post-damage characterization of the same properties. Structural changes were assessed by subjecting tissue to damage cycles and staining with hematoxylin and eosin or fluorescing collagen hybridizing peptides (F-CHP).
View Article and Find Full Text PDFDesign and Analysis of an Autonomous Active Ankle-Foot Prosthesis with 2-DoF.
Sensors (Basel)
August 2025
Department of Robotics and Technical Tools of Automation, Satbayev University, Almaty 050013, Kazakhstan.
This paper presents the development, modeling, and analysis of an autonomous active ankle prosthesis with two degrees of freedom (2-DoF), designed to reproduce movements in the sagittal (dorsiflexion/plantarflexion) and frontal (inversion/eversion) planes in order to enhance the stability and naturalness of the user's gait. Unlike most commercial prostheses, which typically feature only one active degree of freedom, the proposed device combines a lightweight mechanical design, a screw drive with a stepper motor, and a microcontroller-based control system. The prototype was developed using CAD modeling in SolidWorks 2024, followed by dynamic modeling and finite element analysis (FEA).
View Article and Find Full Text PDF