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Related Experiment Video

Updated: Jun 16, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

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Published on: December 20, 2024

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Gold vs. CAD/CAM ceramic partial-crowns: 20-year randomized clinical study.

Fabian Cieplik1, Julia L Pfister2, Karl-Anton Hiller2

  • 1Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, Regensburg, Germany; Department of Operative Dentistry and Periodontology, Center for Dental Medicine, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

Dental Materials : Official Publication of the Academy of Dental Materials
|June 14, 2025
PubMed
Summary
This summary is machine-generated.

This 20-year study found that ceramic partial crowns (PCCs) have similar survival rates to gold crowns (CGPCs). While both restorations performed acceptably, CGPCs showed slight advantages in specific criteria.

Keywords:
CAD/CAMCeramicsClinical studies/trialsRestorative dentistryRestorative materials

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Clinical Prosthodontics

Background:

  • Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) partial ceramic crowns (PCCs) are widely used.
  • Long-term clinical data comparing PCCs with traditional cast gold partial crowns (CGPCs) are limited.
  • A 20-year follow-up is crucial to assess the longevity and performance of dental restorations.

Purpose of the Study:

  • To compare the cumulative survival and clinical performance of CAD/CAM PCCs versus CGPCs over 20 years.
  • To test the hypothesis that CGPCs and PCCs exhibit similar long-term outcomes.
  • To provide systematic clinical data on the 20-year service of these partial crown types.

Main Methods:

  • A prospective, randomized, split-mouth study involving 29 patients.
  • Each patient received one CGPC and one PCC.
  • Examinations at 20 years utilized modified USPHS and FDI criteria, with Kaplan-Meier survival analysis.

Main Results:

  • Cumulative survival rates were 69% for CGPCs and 53% for PCCs, without statistical significance.
  • All evaluated restorations met acceptable clinical standards (USPHS: Alpha/Bravo; FDI: 1-3).
  • Both crown types showed deterioration in surface luster and marginal discoloration; PCCs had worse marginal adaptation over time.

Conclusions:

  • Both PCCs and CGPCs demonstrated acceptable clinical results after 20 years.
  • CGPCs showed slight advantages in specific criteria like surface staining and marginal adaptation.
  • PCCs offer similar long-term survival to CGPCs with only slightly inferior performance, supporting their clinical recommendation.