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Related Experiment Videos

Dimensional stability of thermosensitive gutta-percha

C Q Lee1, Y Chang, C M Cobb

  • 1Department of Endodontics, School of Dentistry, University of Missouri-Kansas City 64108-2784, USA.

Journal of Endodontics
|May 20, 1998
PubMed
Summary

Thermosensitive gutta-percha (GP) endodontic materials expand when heated and shrink when cooled. Different brands exhibit varying degrees of volume change, impacting clinical performance.

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Area of Science:

  • Endodontics
  • Materials Science
  • Dental Materials

Background:

  • Gutta-percha is a primary root canal filling material.
  • Thermosensitive gutta-percha formulations are designed for specific clinical applications.
  • Understanding the thermal expansion and contraction of gutta-percha is crucial for endodontic success.

Purpose of the Study:

  • To evaluate the thermal expansion and shrinkage of four commercial brands of thermosensitive gutta-percha.
  • To quantify the volume changes under different cooling scenarios relevant to endodontic procedures.

Main Methods:

  • A modified volume dilatometry technique using Pyrex glass capillary tubes was employed.
  • Samples were subjected to controlled heating from 24°C to 80°C and subsequent cooling to 24°C or 37°C.

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  • Percent volume change was monitored at 2°C intervals by observing mercury meniscus levels.

    • Main Results:

    • All gutta-percha samples exhibited expansion upon heating and shrinkage upon cooling.
    • Heating to 80°C resulted in volume expansion ranging from +11.62% to +12.25%.
    • Cooling to 24°C caused shrinkage from -2.22% to -3.53%. Cooling to 37°C led to a final positive volume change of +5.50% to +7.20% after stabilization, with significant inter-brand differences.

    Conclusions:

    • Thermosensitive gutta-percha undergoes significant volume changes with temperature fluctuations.
    • The degree of expansion and shrinkage varies between commercial brands.
    • These volume changes, particularly the net expansion at body temperature, have implications for the seal and longevity of root canal fillings.