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Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses
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Are inert glasses really inert?

Melissa Tiskaya1, Albiha Salihi1, Saroash Shahid1

  • 1Queen Mary University of London, Barts & The London School of Medicine and Dentistry, Institute of Dentistry, Centre for Oral Bioengineering, Mile End Road, London E1 4NS, UK.

Dental Materials : Official Publication of the Academy of Dental Materials
|September 26, 2022
PubMed
Summary
This summary is machine-generated.

Inert glass fillers in dental composites release ions, challenging their perceived inertness. This ion leaching may negatively impact composite performance and interfere with bioactive fillers.

Keywords:
DegradationInert glassIon releaseLeaching

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials Science

Background:

  • Conventional resin-based composites utilize inert glass fillers for radiopacity, reduced shrinkage, and improved mechanical properties.
  • The long-term stability and potential degradation of these fillers in oral environments are critical considerations for material longevity.

Purpose of the Study:

  • To investigate the degradation behavior of commonly used inert glass fillers in dental composites.
  • To assess ion release and structural changes of these fillers under simulated oral conditions.

Main Methods:

  • Five different 1 µm glass powders were immersed in acetic acid (pH 4) and tris buffer (pH 7.4) for 4 weeks.
  • Characterization involved ATR-FTIR, XRD, ICP-OES, ISE, and pH measurements to analyze degradation and ion release.

Main Results:

  • No significant structural degradation or crystallization was observed via FTIR and XRD.
  • Substantial ion release, particularly barium, was detected from specific fillers (BABFG, CDL) in both acidic and neutral conditions.
  • Ion release was generally higher in acidic conditions, with notable exceptions for fluoride release.

Conclusions:

  • So-called inert glass fillers exhibit ion leaching, potentially compromising dental composite integrity and function.
  • Released ions may negatively affect mechanical properties, increase wear, and interfere with the performance of bioactive glass fillers.