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.

Novel Cyclic Fatigue Testing Machine for Endodontic Files

Alizzio D.;
2020

Abstract

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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3175077
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 4
social impact