Mechanical Properties of Various Heat-treated Nickel-titanium Rotary Instruments

New thermomechanically treated NiTi alloys – a review

“…In accordance with these findings, several studies proved that Hyflex EDM exhibits a significantly increased cyclic fatigue resistance compared with Hyflex CM, M-Wire and conventional NiTi instruments (Kaval et al 2016, Pedull a et al 2016, Pirani et al 2016, Goo et al 2017, G€ undo gar & € Ozy€ urek 2017, Iacono et al 2017. The flexibility of Hyflex EDM was found to be similar to other CM Wire instruments (Goo et al 2017, Iacono et al 2017. Hyflex EDM has been reported to create a centred root canal preparation, respecting the original root canal anatomy ( € Ozy€ urek et al 2017, Pinheiro et al 2018, Venino et al 2017).…”

“…CM Wire instruments have a significantly enhanced cyclic fatigue resistance compared with M-Wire and conventional NiTi instruments (Shen et al 2011b, Plotino et al 2014a, Capar et al 2015, Goo et al 2017, Soares et al 2017, AlShwaimi 2018, which might be attributed to their martensitic state. CM Wire instruments exhibited a greater angle of deflection at failure than M-Wire and conventional NiTi, but the maximum torque was nearly equal (Casper et al 2011, Peters et al 2012.…”

“…The flexibility of Hyflex EDM was found to be similar to other CM Wire instruments (Goo et al . , Iacono et al . ).…”

“…CM Wire instruments have greater flexibility than M-Wire and conventional NiTi instruments (Testarelli et al 2011, Pongione et al 2012, Ninan & Berzins 2013, Santos Lde et al 2013, Pereira et al 2015, Goo et al 2017, Soares et al 2017. The improved flexibility is mainly be attributed to the fact that the critical stress to induce martensite reorientation (twinned to deformed martensite) in martensitic instruments is much lower than the critical stress to induce SIM transformation (austenite to deformed martensite) in austenitic instruments (Fig.…”

Several factors can affect the root canal transportation of MB2 canals in extracted maxillary first molars

“…, Goo et al . , Duque et al . ) and concluded that the more flexible NiTi alloys favoured less canal transportation.…”