Novel Cyclic Fatigue Testing Machine for Endodontic Files

The characteristics of superelasticity and shape-memory of the NiTi make endodontic rotary files suitably flexible and resistant while operating within curved canals. However, continuous rotation within accentuated curvatures causes stresses that can lead to intraoperative fracture by torsional shea...

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Bibliographic Details
Published in:Experimental techniques (Westport, Conn.) Conn.), 2020-10, Vol.44 (5), p.649-665
Main Authors: Lo Savio, F., La Rosa, G., Bonfanti, M., Alizzio, D., Rapisarda, E., Pedullà, E.
Format: Article
Language:English
Subjects:
Bend tests
Bending fatigue
Bending machines
Canals
Characterization and Evaluation of Materials
Chemistry and Materials Science
Fatigue life
Fatigue testing machines
Fatigue tests
Materials Science
Performance prediction
Research Paper
Roll bending
Shape memory alloys
Superelasticity
Surgical instruments
Thermography
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Summary:The characteristics of superelasticity and shape-memory of the NiTi make endodontic rotary files suitably flexible and resistant while operating within curved canals. However, continuous rotation within accentuated curvatures causes stresses that can lead to intraoperative fracture by torsional shear or flexural cyclic fatigue. The aim of this paper is to design and build a rotary bending testing machine able to estimate reproducibly the fatigue life of endodontic instruments. The main innovation of this apparatus consists in ensuring that the file rotates freely, not being forced within a suitable shaped housing, and this provides both advantages of reducing the influence of the friction phenomena and maintaining unchanged geometric parameters. A further element of novelty is the real-time measurement of the bending force during the test up to the failure. Moreover, such a machine makes it possible to perform predictive thermographic tests of the file fatigue life and to monitor the energetic trend of the static and rotary bending while testing.
ISSN:0732-8818
1747-1567
DOI:10.1007/s40799-020-00386-5