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Related Experiment Videos

A crown for clinically investigating microleakage.

D A Felton1, S C Bayne, B E Kanoy

  • 1Department of Prosthodontics, University of North Carolina, School of Dentistry, Chapel Hill.

The Journal of Prosthetic Dentistry
|July 1, 1991
PubMed
Summary

This study tested a new cast crown design with an access port for microleakage. The innovative design effectively prevented leakage in human subjects, showing promising results for dental applications.

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Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Microleakage in dental restorations can compromise treatment longevity.
  • Cast crowns are common prosthetic devices requiring effective marginal seal.
  • In vivo studies are crucial for evaluating the clinical performance of dental materials.

Purpose of the Study:

  • To evaluate the efficacy of a cast crown with an access port for in vivo microleakage studies.
  • To assess the sealing ability of the access port under simulated oral conditions.
  • To determine the suitability of the device for use in human subjects.

Main Methods:

  • Fifteen complete cast crowns with facial access ports were fabricated.
  • Gingival margins were modified to challenge the sealing mechanism.

Related Experiment Videos

  • Crowns underwent 750 thermocycles (5°C to 60°C) over 24 hours.
  • Devices were subjected to cyclic air pressure (90 psi) and vacuum (28 mm Hg) during silver nitrate immersion.
  • Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyzed leakage.

    • Main Results:

    • Thirteen of the 13 tested devices demonstrated no microleakage.
    • Control groups exhibited 100% leakage, indicating the effectiveness of the tested design.
    • SEM and EDS confirmed the absence of silver nitrate penetration in the test group.

    Conclusions:

    • The cast crown with an access port design is effective in preventing microleakage.
    • The tested device shows high potential for successful application in human subjects.
    • This innovative design offers a reliable method for in vivo microleakage assessment.