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Nickel-titanium (NiTi) endodontic rotary instruments are used extensively in root canal procedures by both general dentists and specialists. However, their vulnerability to fracture is the major reason for clinicians' concern regarding their use. The objective of this study was to investigate the potential effects of spring machining of the file shaft on the fatigue and torsional resistances of NiTi rotary instruments. Three types of NiTi rotary systems with (S) and without (NS) springdoi:10.3390/ma13225246 pmid:33233623 pmcid:PMC7699742 fatcat:nbdmhxsiqbdzdebxuhl64bl5dm