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Related Experiment Videos

Button versus buttonless castings for removable partial denture frameworks

H Mohammed1, M A Hassaballa, Y F Talic

  • 1Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.

The Journal of Prosthetic Dentistry
|October 1, 1994
PubMed
Summary
This summary is machine-generated.

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Using minimal metal for casting removable partial dentures (RPDs) can yield defect-free results. Optimal spruing and metal feeding are key to successful RPD casting with less material.

Area of Science:

  • Dental Prosthodontics
  • Materials Science in Dentistry

Background:

  • Casting removable partial dentures (RPDs) traditionally uses excess metal, leading to material waste and potential defects.
  • Optimizing metal usage in RPD casting could improve efficiency and casting quality.

Purpose of the Study:

  • To determine if minimal metal casting can produce complete and sound RPD frameworks.
  • To evaluate the impact of spruing methods and metal feeding direction on casting quality with reduced metal volume.

Main Methods:

  • A factorial design was employed to cast 60 Kennedy class II, modification 1 RPDs.
  • Three spruing methods, two metal feeding directions, and two metal weights (full button vs. no button) were tested.
  • Castings underwent visual and radiographic examination for completeness and defects.

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Main Results:

  • Minimal metal casting was as successful as using a full button when appropriate spruing and feeding were used.
  • Completeness and porosity were evaluated across clasps, connectors, and meshworks.
  • Indirect metal feeding proved effective for maxillary RPDs with proper spruing.

Conclusions:

  • Successful RPD casting is achievable with minimal metal, challenging the necessity of a full casting button.
  • Proper technique selection (spruing and feeding) is critical for defect-free RPD frameworks, regardless of metal volume.