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Metal-free materials for fixed prosthodontic restorations.

Carlo E Poggio1, Carlo Ercoli, Lorena Rispoli

  • 1Department of Prosthodontics, University of Rochester Eastman Institute for Oral Health, 601 Elmwood Ave, Box 683, Rochester, NY, USA, 14642.

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Current evidence is insufficient to determine if metal-free dental restorations are more effective than traditional metal-ceramic options. More high-quality research is needed to compare their long-term clinical performance.

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Area of Science:

  • Dental materials science
  • Prosthodontics
  • Clinical trial methodology

Background:

  • Fixed prosthodontic treatments utilize various materials to replace missing teeth.
  • Traditional metal-ceramic (MC) restorations are common, but metal-free alternatives offer potential aesthetic advantages.
  • Comparative clinical performance data for different fixed prosthodontic materials remain unclear.

Purpose of the Study:

  • To evaluate the clinical effectiveness of metal-free prosthodontic restorations compared to metal-ceramic or conventional all-metal materials.
  • To assess the comparative outcomes of different metal-free dental restorative systems.

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials (RCTs).
  • Searched multiple databases including Cochrane Library, MEDLINE, and Embase up to May 2017.
  • Included RCTs comparing metal-free restorations with MC or all-metal restorations, or comparing different metal-free systems.

Main Results:

  • Nine RCTs with 448 participants were included, with most trials assessed as having a high risk of bias.
  • All evidence was rated as very low quality due to bias and imprecision, leading to high uncertainty in results.
  • Specific comparisons showed insufficient evidence of difference in failure rates or complications for various metal-free crowns and fixed dental prostheses (FDPs) versus conventional materials.

Conclusions:

  • Insufficient evidence exists to support or refute the effectiveness of metal-free materials over conventional restorations.
  • The very low quality of current evidence necessitates caution when interpreting results.
  • Further well-designed RCTs are urgently needed to guide clinical decisions on material selection for fixed prosthodontic treatments.