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Marginal Gap of Milled versus Cast Gold Restorations.

Russell Johnson1, Ronald Verrett1, Stephan Haney1

  • 1Graduate Prosthodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|February 5, 2016
PubMed
Summary

Milled gold copings offer an acceptable vertical marginal gap compared to traditional casting. Adjustments improved fit for most groups, with milled beveled margins showing the best fit.

Keywords:
CAD/CAMcomputer aidedcrownmarginal discrepancy

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Prosthodontics

Background:

  • Accurate marginal fit of full coverage gold copings is crucial for restoration longevity.
  • Traditional casting techniques for gold restorations are well-established but can be labor-intensive.
  • CAD/CAM milling offers a potential alternative for fabricating dental prosthetics with high precision.

Purpose of the Study:

  • To compare the vertical marginal gap of cast versus milled full coverage gold copings.
  • To evaluate the influence of two margin designs (chamfer and chamfer bevel) on marginal gap.
  • To assess the effect of fitting adjustments on the vertical marginal gap of both fabrication methods.

Main Methods:

  • Fabrication of cast and milled gold copings using high noble gold alloy on master dies with chamfer and chamfer-bevel margins.
  • Measurement of vertical marginal gap using a measuring microscope before and after fitting adjustments.
  • Statistical analysis using independent and paired t-tests to compare groups.

Main Results:

  • Milled gold copings with a beveled margin exhibited a significantly smaller marginal gap (11.7 ± 20.4 μm) than cast gold copings with a beveled margin (43.6 ± 46.8 μm) after adjustment.
  • Cast gold copings with a chamfer margin showed a smaller marginal gap (22.7 ± 24.7 μm) than milled gold copings with a chamfer margin (27.9 ± 31.6 μm) post-adjustment.
  • Adjustments significantly reduced the marginal gap in cast groups and the milled chamfer bevel group, but not the milled chamfer group.

Conclusions:

  • Milled gold restorations, under the tested parameters, provide an acceptable vertical marginal gap.
  • Milling technology presents a viable alternative to traditional gold crown casting.
  • Margin design and post-fabrication adjustments play significant roles in achieving optimal marginal fit.