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Related Experiment Videos

Deformation of crowns during cementation.

P R Wilson1, R J Goodkind, R Delong

  • 1University of Minnesota, School of Dentistry, Minneapolis.

The Journal of Prosthetic Dentistry
|November 1, 1990
PubMed
Summary

Crown deformation during cementation can be reduced by using low-viscosity cements and ensuring proper die spacing. Minimizing seating forces is crucial for passive fitting of dental crowns.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Prosthodontics

Background:

  • Dental crown cementation is a critical step in prosthodontic treatment.
  • Crown deformation during cementation can lead to poor marginal fit and long-term complications.
  • Understanding the factors influencing crown deformation is essential for predictable clinical outcomes.

Purpose of the Study:

  • To investigate the deformation of dental crowns during the cementation process.
  • To identify key factors that influence crown deformation.
  • To provide recommendations for minimizing crown deformation during clinical application.

Main Methods:

  • Utilized a loading system with silicone fluids to simulate dental cements.
  • Measured crown deformation using strain gauges around the cervical margins.
  • Simulated die spacing through etching and venting by screw removal.
  • Confirmed findings with terminal cementation using zinc phosphate cement.

Main Results:

  • Crown deformation decreased with lower fluid viscosity, increased crown thickness, and venting.
  • Die etching reduced crown seating time but did not affect deformation levels.
  • Terminal cementation confirmed crown deformation during the process.

Conclusions:

  • Low-viscosity cements, reduced seating forces, and die spacing are recommended to minimize crown deformation.
  • Passive fitting of dental crowns is paramount for successful prosthodontic restorations.
  • Findings have implications for bonded and all-ceramic crown applications, explaining clinical phenomena.

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