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Related Experiment Videos

Crown-down tip design and shaping.

Teresa Ponce de Leon Del Bello1, Nancy Wang, James B Roane

  • 1Department of Endodontics, Oklahoma University, College of Dentistry, Oklahoma City 73190, USA.

Journal of Endodontics
|August 22, 2003
PubMed
Summary
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Biconical file tips (Flex-R) best maintain curved root canal shape during crown-down instrumentation, showing less transportation and no ledging. Pyramidal tips (Flex-O) resulted in more canal transportation, ledging, and instrument damage.

Area of Science:

  • Endodontics
  • Dental materials science
  • Biomaterials engineering

Background:

  • Root canal preparation aims to clean and shape the root canal system.
  • Instrument design, particularly tip shape, can influence procedural outcomes.
  • Maintaining original canal anatomy is crucial for successful endodontic treatment.

Purpose of the Study:

  • To compare the shaping effectiveness of three stainless-steel endodontic file tip shapes.
  • To evaluate the impact of tip shape on canal transportation, ledging, and instrument integrity.
  • To determine which file tip design best preserves root canal curvature during crown-down preparation.

Main Methods:

  • Ninety curved root canals in acrylic blocks were divided into three groups based on curvature.

Related Experiment Videos

  • Each group was shaped using a crown-down technique with files featuring biconical (Flex-R), conical (Mor-Flex), or pyramidal (Flex-O) tips.
  • Canal morphology was analyzed pre- and post-shaping using NIH image software; transportation, ledging, and instrument damage were recorded.

    • Main Results:

    • Significant differences in preparation outcomes were observed among the three tip shapes.
    • Biconical tip files (Flex-R) resulted in minimal canal transportation and no ledging.
    • Pyramidal tip files (Flex-O) led to the most transportation, frequent ledging, and instrument damage, including file separation.

    Conclusions:

    • Biconical file tips (Flex-R) demonstrated superior ability to maintain original canal curvature compared to conical and pyramidal tips.
    • Pyramidal tip files (Flex-O) were associated with increased procedural risks like ledging and file separation.
    • File tip design is a critical factor influencing the success of crown-down rotational instrumentation in curved root canals.