Nickel–titanium instruments in endodontics: a concise review of the state of the art - Gavini, Giulio; Santos, Marcelo dos; Caldeira, Celso Luiz; Machado, Manoel Eduardo de Lima; Freire, Laila Gonzales; Iglecias, Elaine Faga; Peters, Ove Andreas; Candeiro, George Taccio de Miranda (Brazilian Oral Research, 2018)