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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Sintering Pmperature-Dependence on Radiopacity of Bi

May-Show Chen1,2, Shih-Hsun Chen3, Fu-Chih Lai4

  • 1School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei 11031, Taiwan. mayshowc@hotmail.com.

Materials (Basel, Switzerland)
|September 14, 2018
PubMed
Summary
This summary is machine-generated.

Zirconium oxide addition to bismuth oxide enhances dental radiography resolution. Heat treatment modifies particle phases and surface roughness, improving radiopacity for better dental imaging applications.

Keywords:
bismuth oxidemineral trioxide aggregateradiopacitysol-gel processzirconia

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Radiology

Background:

  • Bismuth oxide (Bi₂O₃) enhances dental radiography resolution but has biocompatibility concerns.
  • Zirconium oxide (ZrO₂) is explored as a modifier to improve Bi₂O₃ properties.

Purpose of the Study:

  • To modify bismuth oxide radiopacity with zirconium oxide using a sol-gel process.
  • To investigate the effects of heat treatment on the composition and properties of Bi₂O₃-ZrO₂ composites.

Main Methods:

  • Sol-gel synthesis of Bi₂-ₓZrₓO₃₊ₓ/₂ particles.
  • Characterization using Thermogravimetry analysis (TGA), DSC, FT-IR, TEM, and XRD.
  • Evaluation of radiopacity in mmAl.

Main Results:

  • Phase transformation from α-Bi₂O₃ to β-Bi₇.₃₈Zr₀.₆₂O₁₂.₃₁ occurred above 750 °C.
  • Increased ZrO₂ content (x=0.2 to 1.0) enhanced surface roughness.
  • Bi₁.₈Zr₀.₂O₃.₁ powders showed increased radiopacity (4.90 to 5.83 mmAl) with heat treatment up to 750 °C.

Conclusions:

  • Sol-gel derived Bi₂O₃-ZrO₂ composites offer tunable radiopacity.
  • Heat treatment is crucial for phase control and property enhancement.
  • These modified materials show potential for improved dental radiography resolution.