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Gambarini G, Plotino G, Grande NM, Al‐Sudani D, De Luca M, Testarelli L. Mechanical properties of nickel–titanium rotary instruments produced with a new manufacturing technique. International Endodontic Journal.

Aim  To investigate whether flexibility and cyclic fatigue resistance was increased for nickel–titanium instruments produced by a new manufacturing technique.

Methodology  Forty K3 tip size 25, 0.06 taper (SybronEndo) nickel–titanium rotary instruments were randomly selected and divided into two groups (n = 20). One group served as control, being the commercially available instruments produced with a traditional grinding process (K3). The second group of instruments (K4 prototypes) were then subjected to a proprietary thermal treatment after the grinding process. Finally, each group was randomly divided into two subgroups of 10 instruments each, to perform the stiffness test and …