10 Questions
What is the main reason for the unexpected separation of NiTi endodontic rotary files during root canal instrumentation?
Inadequate torsional resistance and cyclic fatigue resistance
What are the two distinct fracture mechanisms described for NiTi endodontic files?
Torsional load fatigue and cyclic fatigue
Which of the following situations is most likely to cause torsional fatigue in NiTi endodontic files?
If the instrument tip is larger than the canal section to be shaped
What is the purpose of the device mentioned in the text for testing torsional fatigue resistance of engine-driven NiTi files?
To measure the torsional strength of NiTi files
What is the main advantage of nickel-titanium (NiTi) hand instruments over stainless steel instruments in endodontic procedures?
Superelastic characteristics
What is the main drawback of using NiTi endodontic rotary files in clinical practice?
Unexpected separation of files during use
Which of the following factors does NOT contribute to the weakening of NiTi endodontic files during use?
Inadequate file tip size
What is the main reason for the clinician's misconception about the torsional strength of NiTi endodontic files?
Confusion between superelastic characteristics and torsional strength
Which of the following factors can contribute to torsional load fatigue in NiTi endodontic files?
Excessive pressure applied by the operator during filing
What is the main purpose of improving the torsional resistance and cyclic fatigue resistance of NiTi endodontic files?
To reduce the risk of file separation during use
Test your knowledge on the shape memory effect and NiTi endodontic files, including popular brands like ProFile, ProFile GT, Mtwo, and LightSpeed. Learn about the reversible transition between austenite and martensite phases and their clinical applications in root canals.
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