“…Early studies used hand instrumentation techniques, such as the Step-Back and Crown-Down, to prepare the tooth samples (Barletta et al, 2007;de Oliveira et al, 2006). With the introduction of engine-driven nickel-titanium instruments, the tooth samples are now usually prepared using one of these systems (Bueno et al, 2017;Campello et al, 2019;Uzunoglu et al, 2015).…”