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Related Concept Videos

Application of Pascal's Law01:03

Application of Pascal's Law

Pascal's experimentally proven observations—that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid and to the walls of its container—provide the foundations for hydraulics, one of the most important developments in modern mechanical technology.
Hydraulic systems are used to operate automotive brakes, hydraulic jacks, and numerous other mechanical systems. We can derive a relationship between the forces in a simple hydraulic system by applying...
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
Pascal's Law01:04

Pascal's Law

In 1653, the French philosopher and scientist Blaise Pascal published "Treatise on the Equilibrium of Liquids," which discussed the principles of static fluids. A static fluid is a fluid that is not in motion. When a fluid is not flowing, we say that the fluid is in static equilibrium. If the fluid is water, we say it is in hydrostatic equilibrium. For a fluid in static equilibrium, the net force on any part of the fluid must be zero; otherwise, the fluid will start to flow. Pascal observed...
Fluid Pressure01:14

Fluid Pressure

In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific weight or...

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Related Experiment Video

Updated: May 22, 2026

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research
05:16

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research

Published on: October 27, 2023

Hydrostatic pulpal pressure effect upon microleakage.

Howard W Roberts1, David H Pashley

  • 181 DS/SGD, 606 Fisher Street, Keesler AFB, MS 39534, USA. howard.roberts@us.af.mil

American Journal of Dentistry
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

Hydrostatic pulpal pressure may reduce microleakage in dental restorations, particularly at the gingival wall. This finding suggests a potential new method for improving restoration longevity and sealing effectiveness.

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Published on: March 7, 2014

Related Experiment Videos

Last Updated: May 22, 2026

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research
05:16

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research

Published on: October 27, 2023

In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint
07:09

In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint

Published on: March 7, 2014

Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials Engineering

Background:

  • Microleakage is a significant concern in dental restorations, potentially leading to secondary caries and pulpal inflammation.
  • Understanding factors influencing microleakage is crucial for developing more durable and effective restorative techniques.

Purpose of the Study:

  • To investigate the role of hydrostatic pulpal pressure in mitigating microleakage in Class 5 dental preparations.
  • To determine if simulated pulpal pressure can enhance the marginal seal of restorations.

Main Methods:

  • Class 5 preparations were made on human molars with one margin on root dentin.
  • Teeth were divided into three groups: hydrostatic pressure simulation (20 cm H2O), no pressure control, and conventional microleakage.
  • Specimens were immersed in methylene blue dye for 24 hours, sectioned, and microleakage was quantified using a traveling microscope.

Main Results:

  • Specimens subjected to hydrostatic pulpal pressure exhibited reduced microleakage along the gingival wall compared to control groups.
  • No significant difference in microleakage was observed between hydrostatic pressure and control groups on occlusal preparation walls.

Conclusions:

  • Hydrostatic pulpal pressure appears to play a role in reducing microleakage at the gingival margin of Class 5 restorations.
  • Further research is warranted to explore the clinical implications of managing pulpal pressure for improved restoration sealing.