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Corrosion02:49

Corrosion

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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A novel coating layer on zirconia using modified zinc phosphatizing method.

Kouta Kodama1, Alireza Valanezhad2, Mohammad Khodaei3

  • 1Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University.

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|March 11, 2021
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Summary

This study developed a zinc phosphate coating on yttria-doped zirconia for dental applications. The coating enhanced cell attachment and proliferation without compromising the material's strength.

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CoatingZinc phosphateZirconia implant

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Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Surface Chemistry

Background:

  • Yttria-doped zirconia (ZrO2) is a widely used dental ceramic.
  • Improving the surface properties of zirconia can enhance its biocompatibility and clinical performance.
  • Developing effective surface modifications is crucial for advanced dental materials.

Purpose of the Study:

  • To develop and characterize a novel zinc phosphate coating on yttria-doped zirconia.
  • To evaluate the effects of the coating on the adhesive strength and mechanical properties of zirconia.
  • To assess the in vitro biological response of MC3T3-E1 cells on the coated zirconia surface.

Main Methods:

  • Coating deposition via acidic zinc phosphatizing solution and hydrothermal treatment.
  • Surface analysis using field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS).
  • Biaxial flexural strength measurement (ISO 6872), adhesive strength testing, and in vitro cell studies (SEM, MTS assay).

Main Results:

  • Successful preparation of a uniform zinc phosphate (hopeite) coating on zirconia.
  • Achieved an adhesive strength of 79.11 MPa.
  • Enhanced MC3T3-E1 cell attachment, morphology, and proliferation on the coated surface.
  • No significant impact on the flexural strength of zirconia after coating and hydrothermal treatment.

Conclusions:

  • The developed zinc phosphate coating is a promising surface modification for yttria-doped zirconia.
  • The coating improves biocompatibility by enhancing cellular response.
  • This approach offers potential for improved performance of zirconia-based dental restorations.