Endodontic Procedures: Apical Preparation and Barrier Formation
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Questions and Answers

What is the purpose of Gates-Glidden sizes 4, 3, and 2 in the crown-down technique?

  • To remove pulp chamber obstructions
  • To establish working length
  • To enlarge canal orifices (correct)
  • To complete apical preparation
  • When using the step-down technique, which part of the canal is flared with Gates Glidden drills or rotary files?

  • Coronal one third (correct)
  • Canal orifices
  • Apical one third
  • Mid-root portion
  • What size file is typically used in the canal to reach the apical portion during the crown-down technique?

  • #30
  • #50
  • #15
  • #70 (correct)
  • How is the final apical preparation size determined in the crown-down technique?

    <p>By introducing progressively larger files until resistance</p> Signup and view all the answers

    Which instrument is primarily used to establish the working length in the crown-down technique?

    <p>#10 file</p> Signup and view all the answers

    In which direction is a large file like size #70 placed in the canal during apical preparation?

    <p>Clockwise rotation</p> Signup and view all the answers

    What is one of the primary objectives in cleaning and shaping the root canal system?

    <p>Remove infected soft and hard tissue</p> Signup and view all the answers

    What is an important mechanical objective in root canal instrumentation?

    <p>Complete incorporation of original canals into the prepared shape</p> Signup and view all the answers

    What is a biologic advantage of enlarged apical canals and finer needles in root canal treatment?

    <p>Allow deeper needle placement improving debridement and disinfection</p> Signup and view all the answers

    Why is it important to retain as much cervical and radicular dentin as possible during root canal instrumentation?

    <p>To prevent root fractures</p> Signup and view all the answers

    What is one of the goals that is unlikely to be fully met with current techniques in root canal instrumentation?

    <p>Complete preparation of all root canal surfaces</p> Signup and view all the answers

    Which of the following is NOT a primary objective in cleaning and shaping the root canal system?

    <p>Increasing needle placement depth</p> Signup and view all the answers

    What is the main purpose of creating an apical matrix or barrier at the proper working length during apical preparation?

    <p>To serve as a stop for gutta percha condensation</p> Signup and view all the answers

    What is the function of apical patency during cleaning and shaping procedures?

    <p>To maintain working length and prevent apical blockage</p> Signup and view all the answers

    Why is it important to avoid forcing debris through the apical foramina?

    <p>To prevent trauma to periapical tissue</p> Signup and view all the answers

    What is the average distance from the apical foramen to the apical constriction?

    <p>0.5 millimeters</p> Signup and view all the answers

    Which factor influences the choice of obturation technique in apical preparation?

    <p>Canal shape and size</p> Signup and view all the answers

    What is the significance of apical constriction in root canal treatment?

    <p>It serves as a landmark for root canal length determination</p> Signup and view all the answers

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