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Related Experiment Videos

Thermal expansion coefficient of titanium casting.

D Low1, T Sumii, M Swain

  • 1Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, New South Wales, Australia. dannylow@scientist.com

Journal of Oral Rehabilitation
|May 15, 2001
PubMed
Summary

Accurate thermal expansion coefficient (alpha) measurement is crucial for metal-ceramic crowns. Reducing heating and cooling rates to 1°C/min minimizes discrepancies, ensuring reliable material selection for dental applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Ceramics

Background:

  • Porcelain-fused to metal (PFM) crowns require precise thermal expansion coefficient (alpha) matching between metal and porcelain.
  • Inconsistent alpha measurements can lead to poor thermal mismatch, affecting crown longevity and aesthetics.

Purpose of the Study:

  • To investigate the influence of heating rate and specimen conditions on the measured alpha value of commercially pure cast titanium.
  • To establish reliable parameters for determining alpha values suitable for titanium-ceramic applications.

Main Methods:

  • Commercially pure cast titanium rods ('as cast' and sandblasted) were subjected to controlled heating and cooling cycles at various rates.
  • Thermal expansion coefficient (alpha) was measured under different experimental conditions to assess variability.

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Main Results:

  • Discrepancies in alpha values between heating and cooling phases were found to be insignificant when the heating/cooling rate was reduced to 1°C/min.
  • Alpha values obtained at a 1°C/min cooling rate are recommended for reliable assessment.

Conclusions:

  • Utilizing a slow cooling rate of 1°C/min ensures accurate alpha measurements for titanium.
  • Dental porcelain with an alpha value below 8.5 x 10^-6 °C is recommended for optimal compatibility with titanium in ceramic applications.