NiTi rotary systems compared | British Dental Journal


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Martins J N R, Silva E J, Marques D _et_ _al._ Influence of Kinematics on the Cyclic Fatigue Resistance of Replicalike and Original Brand Rotary Instruments. _J_ _Endod_ 2020; 8: 1136-1143.


WELL KNOWN BRANDS TESTED AGAINST LOOK-A-LIKES. Instrument separation is a major concern during root canal preparation with rotary NiTi instruments. Stress caused by excessive torsion and


cyclical fatigue in curved canals are likely causes. Manufacturers are now staring to produce systems (termed replicalike systems in this paper), similar to the originals produced by well


known companies, but which are commonly cheaper. The results showed that all systems had a significantly higher time to separation in reciprocating mode than in continuous rotation. The


replicalike systems also showed a significantly longer time to separation than the original instruments, in both reciprocation and continuous rotation. There was no significant difference


between the sizes of the fractured segments. Using energy dispersive spectroscopy, all tested instruments showed an identical ratio between nickel and titanium. However, there are no


international standards to guide the production of, and impose standards on, manufacture of NiTi instruments. Therefore, clinicians may be unaware of the potential risks taken in using


replicalike systems. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Retired GDP/Clinical Teacher, Bexhill-on-Sea, East Sussex, UK Paul Hellyer Authors * Paul Hellyer View author publications


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Dent J_ 229, 473 (2020). https://doi.org/10.1038/s41415-020-2234-y Download citation * Published: 09 October 2020 * Issue Date: October 2020 * DOI: https://doi.org/10.1038/s41415-020-2234-y


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