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Related Experiment Videos

Measurement of hydrostatic pressures during simulated post cementation

G Morando1, R J Leupold, J C Meiers

  • 1Naval Dental School, Bethesda, Md. USA.

The Journal of Prosthetic Dentistry
|December 1, 1995
PubMed
Summary

Zinc phosphate cement generates higher intraradicular hydrostatic pressures during post cementation than resinous or glass ionomer cements. This study developed a method to measure these pressures, aiding in understanding tooth sensitivity and fracture risks.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials

Background:

  • Post cementation in endodontically treated teeth can lead to tooth sensitivity and fracture.
  • Intraradicular hydrostatic pressure is a potential factor contributing to these complications.
  • Quantifying this pressure during cementation is crucial for material selection and procedural improvement.

Purpose of the Study:

  • To develop and validate an in vitro method for measuring intraradicular hydrostatic pressures during post cementation.
  • To compare the hydrostatic pressures generated by different luting agents used for post and core restorations.

Main Methods:

  • An in vitro testing apparatus was designed using a pressure transducer and brush recorder.
  • Precision milled post spaces were created in a Plexiglas block for simulation.

Related Experiment Videos

  • Cast post and cores were cemented using zinc phosphate cement, resinous cement, and glass ionomer cement.

    • Main Results:

    • Mean hydrostatic pressures (psi) were recorded: zinc phosphate cement (22.67), resinous cement (19.77), and glass ionomer cement (17.66).
    • Zinc phosphate cement generated significantly higher hydrostatic pressures compared to resinous and glass ionomer cements.
    • The developed in vitro system effectively discriminated intraradicular pressures among different luting agents.

    Conclusions:

    • The choice of luting agent significantly impacts the intraradicular hydrostatic pressure generated during post cementation.
    • Zinc phosphate cement poses a higher risk of inducing intraradicular pressure compared to resinous and glass ionomer cements.
    • This in vitro model provides a valuable tool for evaluating dental cements and improving post-endodontic restoration protocols to minimize tooth fracture risk.