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
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.
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.
- 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.