Podcast
Questions and Answers
What is the main reason for the unexpected separation of NiTi endodontic rotary files during root canal instrumentation?
What is the main reason for the unexpected separation of NiTi endodontic rotary files during root canal instrumentation?
- Excessive friction against the canal walls
- Larger file tip size compared to the canal section
- Excessive pressure applied by the operator during filing
- Inadequate torsional resistance and cyclic fatigue resistance (correct)
What are the two distinct fracture mechanisms described for NiTi endodontic files?
What are the two distinct fracture mechanisms described for NiTi endodontic files?
- Excessive pressure and large file tip size
- Stress buildup and friction against canal walls
- Torsional load fatigue and cyclic fatigue (correct)
- Torsional load and excessive rubbing against canal walls
Which of the following situations is most likely to cause torsional fatigue in NiTi endodontic files?
Which of the following situations is most likely to cause torsional fatigue in NiTi endodontic files?
- If there is minimal friction against the canal walls
- If the instrument tip is larger than the canal section to be shaped (correct)
- If the instrument tip is smaller than the canal section to be shaped
- If the operator applies minimal pressure on the handpiece during filing
What is the purpose of the device mentioned in the text for testing torsional fatigue resistance of engine-driven NiTi files?
What is the purpose of the device mentioned in the text for testing torsional fatigue resistance of engine-driven NiTi files?
What is the main advantage of nickel-titanium (NiTi) hand instruments over stainless steel instruments in endodontic procedures?
What is the main advantage of nickel-titanium (NiTi) hand instruments over stainless steel instruments in endodontic procedures?
What is the main drawback of using NiTi endodontic rotary files in clinical practice?
What is the main drawback of using NiTi endodontic rotary files in clinical practice?
Which of the following factors does NOT contribute to the weakening of NiTi endodontic files during use?
Which of the following factors does NOT contribute to the weakening of NiTi endodontic files during use?
What is the main reason for the clinician's misconception about the torsional strength of NiTi endodontic files?
What is the main reason for the clinician's misconception about the torsional strength of NiTi endodontic files?
Which of the following factors can contribute to torsional load fatigue in NiTi endodontic files?
Which of the following factors can contribute to torsional load fatigue in NiTi endodontic files?
What is the main purpose of improving the torsional resistance and cyclic fatigue resistance of NiTi endodontic files?
What is the main purpose of improving the torsional resistance and cyclic fatigue resistance of NiTi endodontic files?
