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Bioactive glass coating on zirconia by vacuum sol-dipping method
Mao Yamada1, Alireza Valanezhad2, Takafumi Egoshi1
1Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University.
Dental Materials Journal
|June 14, 2019
Summary
A novel vacuum sol-dipping method successfully coated bioactive glass (BG) onto zirconia substrates, creating a biodegradable and strongly adhered layer. This bioactive glass coating enhances zirconia
Area of Science:
- Biomaterials Science
- Surface Engineering
- Bioceramics
Background:
- Zirconia is a bioinert ceramic widely used in dental and orthopedic implants.
- Achieving strong adhesion of bioactive coatings to bioinert substrates like zirconia remains a challenge.
- Biodegradable and bioactive coatings are desirable for improving implant integration and performance.
Purpose of the Study:
- To develop a method for creating a biodegradable, bioactive, and strongly adhered coating on bioinert zirconia substrates.
- To investigate the efficacy of a vacuum sol-dipping method for coating zirconia with bioactive glass.
- To characterize the properties of the bioactive glass coating on zirconia.
Main Methods:
- Zirconia plates were coated with 45S5 bioactive glass (BG) using a vacuum sol-dipping technique.
- Coated samples were sintered to ensure adhesion and coating integrity.
- Surface morphology and coating coverage were assessed before and after coating.
- Phase structure was analyzed using X-ray diffraction (XRD).
- Interfacial adhesive strength was measured.
Main Results:
- The vacuum sol-dipping method successfully produced a bioactive glass coating on zirconia plates.
- Surface morphology and coverage analysis confirmed successful coating.
- XRD analysis identified the phase structure of the BG coating as Na4Ca4(Si6O18).
- The interfacial adhesive strength exceeded 55±7 MPa, indicating strong adhesion.
- Cell viability tests confirmed the biocompatibility of the coating.
Conclusions:
- The vacuum sol-dipping method is effective for fabricating strongly adhered, bioactive glass coatings on zirconia.
- The developed coating is biodegradable, bioactive, and biocompatible, showing promise for dental and orthopedic applications.
- This technique offers a viable approach to enhance the integration of bioinert zirconia implants.
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