Motorized Rotary Endodontics Principles: A Student's Guide
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66 cards
Question: Which NiTi alloy systems showed superior resistance to cyclic fatigue in the study cited?
Answer: CM-Wire systems (Hyflex EDM and Neoniti) showed superior resistance to cyclic fatigue.
Question: Which instruments were significantly better in terms of resistance for separated fragment lengths?
Answer: F360 (conventional NiTi) and Reciproc (M-Wire) were significantly better for separated fragment lengths.
Question: How many new size 25 files were used in the cyclic fatigue study and how were they allocated?
Answer: 300 new size 25 files were selected, allocated as n=30 per system.
Question: How were the instruments tested for cyclic fatigue in the study (motor, mounting, and procedure)?
Answer: Mechanized with an X-Smart Plus endo motor at manufacturer-recommended speed and torque, held steady with a clamping mechanism in a stainless-steel bl
Question: What did the study by Christofzik et al. conclude about endodontic devices' auto-stop functions?
Answer: All measurement methods showed high accuracy in detecting the apical constriction (AC), and the auto-stop function of these endodontic motors is a rel
Question: What did Ha et al. find about the safety of a 170° set angle in reciprocating motors?
Answer: Under the study conditions, the 170° set angle of dedicated motors for reciprocating file systems is safe at the 5-mm level.
Question: What caution did Ha et al. report regarding reuse of reciprocating systems?
Answer: Reuse of reciprocating systems, even with movements within the elastic limit, may cause deterioration of the instruments.
Question: What was the reported average lifespan of one F2 reciprocating file in curved root canals (You et al.)?
Answer: The average lifespan was 10.60 ± 4.35 canals, with the longest lifespan observed being 21 canals.
Question: How did total canal preparation times compare between continuous motion (CM) and reciprocation motion (RM) groups in You et al.'s study?
Answer: Total time was 46.42 ± 18.12 seconds in the CM group and 21.15 ± 6.70 seconds in the RM group.
Question: What are the two principal failure modes of NiTi endodontic instruments reported in the review by McGuigan et al.?
Answer: NiTi instruments fail principally by torsional overload and flexural (cyclic) fatigue.