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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
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.
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.
- 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.