Shape Memory Effect and NiTi Endodontic Files Quiz
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Questions and Answers

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?

  • 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?

  • 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?

    <p>To measure the torsional strength of NiTi files</p> Signup and view all the answers

    What is the main advantage of nickel-titanium (NiTi) hand instruments over stainless steel instruments in endodontic procedures?

    <p>Superelastic characteristics</p> Signup and view all the answers

    What is the main drawback of using NiTi endodontic rotary files in clinical practice?

    <p>Unexpected separation of files during use</p> Signup and view all the answers

    Which of the following factors does NOT contribute to the weakening of NiTi endodontic files during use?

    <p>Inadequate file tip size</p> Signup and view all the answers

    What is the main reason for the clinician's misconception about the torsional strength of NiTi endodontic files?

    <p>Confusion between superelastic characteristics and torsional strength</p> Signup and view all the answers

    Which of the following factors can contribute to torsional load fatigue in NiTi endodontic files?

    <p>Excessive pressure applied by the operator during filing</p> Signup and view all the answers

    What is the main purpose of improving the torsional resistance and cyclic fatigue resistance of NiTi endodontic files?

    <p>To reduce the risk of file separation during use</p> Signup and view all the answers

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