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Related Experiment Videos

Thermal oxidation effect on porcelain-titanium restoration.

C J Horng, M Okazaki, J Takahashi

    Gaoxiong Yi Xue Ke Xue Za Zhi = the Kaohsiung Journal of Medical Sciences
    |September 1, 1989
    PubMed
    Summary

    Excessive heat treatment of titanium dental restorations can weaken their bond strength due to increased titanium dioxide (TiO2) formation. Optimal thermal processing is crucial for durable porcelain-titanium dental prosthetics.

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    Area of Science:

    • Materials Science
    • Biomaterials Engineering
    • Dental Materials

    Background:

    • Titanium (Ti) offers excellent biocompatibility, strength, and corrosion resistance, making it suitable for dental restorations.
    • Ceramic-metal restorations are widely used in dentistry for their aesthetics and mechanical properties.

    Purpose of the Study:

    • To evaluate the impact of diverse thermal treatments on the bond strength and physical characteristics of the porcelain-titanium system.

    Main Methods:

    • Pure titanium samples underwent thermal treatment in a porcelain furnace at temperatures from 600°C to 1000°C, both under vacuum and in air.
    • X-ray diffraction (XRD) and Vickers hardness testing were employed to analyze material changes.
    • Tension-shear bond strength tests and metallographic microscopy examined the porcelain-titanium interface.

    Main Results:

    • Increasing firing temperature enhanced titanium dioxide (TiO2) formation and Vickers hardness, particularly above 900°C.
    • Firing in air resulted in higher hardness compared to vacuum firing.
    • Tension-shear bond strength decreased with higher temperatures, reaching its lowest point at 1000°C, correlating with a thick TiO2 layer at the interface.
    • The standard degassing procedure for ceramic-gold alloys proved unsuitable for porcelain-titanium.

    Conclusions:

    • Excessive TiO2 formation due to high-temperature treatment weakens the bond strength in porcelain-titanium dental restorations.
    • Optimal thermal processing parameters are critical and differ from those used for conventional ceramic-gold alloys.

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