Radhika E, et al. – The present study sought to compare canal transportation, centering ability, and removed dentin thickness (RDT) using hand nickel–titanium (NiTi) K–flex files and rotary systems in primary molars and using cone beam computed tomography (CBCT). Researchers reported that rotary files demonstrated less canal transportation, more conservation of tooth structure, and superior centering ability compared to hand nickel–titanium K–flex files.