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Related Experiment Videos

Ring volume/ring liner ratio and effective setting expansion.

D R Davis1, J H Nguyen, B L Grey

  • 1School of Dentistry, University of California, San Francisco 94143.

The International Journal of Prosthodontics
|September 1, 1992
PubMed
Summary

The ratio of casting ring volume to liner volume accurately predicts radial setting expansion in gypsum-bonded investments. This finding aids in controlling dimensional accuracy for dental casting procedures.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Casting Technology

Background:

  • Effective radial setting expansion of wax patterns in gypsum-bonded investment is crucial for accurate dental castings.
  • Casting ring diameter is a known influencing factor, but its precise role requires further elucidation.

Purpose of the Study:

  • To test the hypothesis that the ratio of casting ring volume to ring liner volume determines radial setting expansion.
  • To establish a predictive model for radial setting expansion based on casting ring dimensions.

Main Methods:

  • Mesio-occlusodistal inlay wax patterns were invested in plastic casting rings of varying dimensions.
  • Xeroradiography was used to image the invested patterns and measure effective setting expansion.
  • Expansion in standard-sized rings was used to predict expansion in different ring sizes.

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Main Results:

  • The ratio of casting ring volume to ring liner volume was found to be a primary determinant of radial setting expansion.
  • Experimental setting expansion results closely matched the predicted values, validating the predictive model.

Conclusions:

  • The volume ratio of casting rings to their liners effectively predicts radial setting expansion in gypsum-bonded investments.
  • This predictive capability can enhance the control of dimensional accuracy in dental casting processes.