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Quantification of leucite concentration using X-ray diffraction.

J L Ong1, D W Farley, B K Norling

  • 1Department of Restorative Dentistry, Division of Biomaterials, Health Science Center, San Antonio, University of Texas, 7703 Floyd Curl Drive, San Antonio, TX 78284-7890, USA. ong@uthscsa.edu

Dental Materials : Official Publication of the Academy of Dental Materials
|February 24, 2001
PubMed
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X-ray powder diffraction effectively quantifies leucite in dental porcelains. Different calibration methods yielded statistically different leucite concentrations, impacting lattice parameters and unit cell volume.

Area of Science:

  • Materials Science
  • Crystallography
  • Dental Ceramics

Background:

  • Leucite is a key crystalline phase in dental porcelains, influencing their properties.
  • Accurate quantification of leucite is crucial for understanding material performance.

Purpose of the Study:

  • To evaluate the efficacy of X-ray powder diffraction (XRPD) for determining leucite content in three dental porcelains: Finesse, Ceramco II, and IPS Empress.
  • To compare two quantification methods using XRPD: peak height ratios and peak area ratios.

Main Methods:

  • X-ray powder diffraction (XRPD) was employed for analysis.
  • An internal standard (copper) was utilized for quantification.
  • Two calibration curve methods were applied: peak height ratio and peak area ratio.

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Main Results:

  • Statistically significant differences were observed between leucite concentrations determined by the peak height and peak area methods.
  • XRPD analysis provided data on lattice parameters and the unit cell volume of leucite.
  • Leucite in the dental porcelains exhibited expanded a-lattice spacings and contracted c-lattice spacings compared to standard leucite.

Conclusions:

  • The quantification method significantly impacts leucite concentration determination in dental porcelains.
  • Dental porcelain leucite shows altered lattice parameters, leading to a net expansion of the unit cell volume.
  • XRPD is a valuable tool for characterizing leucite in dental ceramics.