Mechanical Properties and Performance of Endodontic Instruments
Summary
The evolution of endodontic instruments has been driven by advances in the mechanical design and metallurgical treatment of nickel–titanium (NiTi) alloys, yielding tools that combine flexibility, strength and fatigue resistance. Instruments engineered with controlled memory alloys or proprietary heat treatments exhibit enhanced phase transformation behaviour, allowing them to negotiate curved canals with minimal risk of fracture. Key parameters influencing clinical performance include cyclic fatigue life under repetitive bending, torsional resistance to twisting loads and surface finish, which together determine the safety margin during canal preparation. Novel cross-sectional designs and variable taper profiles further optimise cutting efficiency and debris removal while reducing stress concentration at critical points. Concurrently, the emergence of reciprocating kinematics and adaptive motion patterns has reshaped our understanding of instrument durability and shaping ability, offering new strategies to mitigate intracanal separation. A holistic appraisal of these properties is essential for clinicians to select instruments that deliver predictable shaping, preserve dentine integrity and minimise procedural complications on a global scale.
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Mechanical Properties and Performance of Endodontic Instruments publication trend
The graph below shows the total number of articles in mechanical properties and performance of endodontic instruments across all publications each year (not limited to Nature Index journals).
Technical terms
Nickel–titanium alloy (NiTi): A shape-memory alloy used in endodontic files that offers superelasticity and biocompatibility.
Cyclic fatigue: Progressive structural damage under repeated bending in curved canals leading to instrument fracture.
Torsional resistance: The ability of a file to withstand twisting loads without experiencing plastic deformation or fracture.
Superelasticity: The reversible deformation capacity of NiTi instruments, allowing them to return to shape after deflection.
References
- Comparative analysis of reciprocating and flat‐side heat‐treated rotary single‐file systems: Design, metallurgical characteristics, and mechanical performance. International Endodontic Journal (2023).
- Significance of heat treatment on the mechanical and fatigue properties of NiTi endodontic rotary files. Journal of Materials Research and Technology (2025).
- Assessment of the Cyclic Fatigue Performance of the Novel Protaper Ultimate File System Used in Different Kinematics: An In Vitro Study. Journal of Functional Biomaterials (2024).
- An Update on Nickel-Titanium Rotary Instruments in Endodontics: Mechanical Characteristics, Testing and Future Perspective—An Overview. Bioengineering (2021).
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