Thermal Expansion Behavior of Leucite, Glass, and Dental Porcelains

DOI 3 Citations 23 References
  • BAN Seiji
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • MATSUO Kenji
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • MIZUTANI Noriyasu
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • KAIKAWA Kentaro
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • HASEGAWA Jiro
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University

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  • リューサイト, ガラスおよび歯科用陶材の熱膨張挙動

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Abstract

Thermal expansion coefficients were determined using a dilatometer on commercial dental porcelains, stoichiometric tetragonal leucite, cesium added cubic leucite, three types of glass, and mixtures of leucite and glass. Thermal expansion coefficients of leucite were also derived from the lattice parameter changes using high temperature X-ray diffractometry. The thermal expansion behaviors of dental porcelains were mainly affected by the thermal expansion behavior of the glass, which constructs the glass matrix in the fired porcelains, although leucite transforms between tetragonal and cubic in the temperature range of 600〜650℃ with a large volume change. These results suggest that the glass surrounding leucite particles is required to have a higher glass transition temperature than 650℃ because of high stress in the surrounded matrix glass.

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