A  

Nickel-titanium (Ni-Ti) spreaders are more flexible, penetrate deeper into curved canals, generate lower condensation forces/stress, and are associated with fewer vertical root fractures than stainless-steel (S/S) spreaders. Therefore, saying that Ni-Ti spreaders achieve “less depth penetration” is incorrect, whereas the other statements accurately reflect Ni-Ti advantages [Schmidt et al., 2000, PMID 11194365; Joyce et al., 1998, PMID 9855819].