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Related Experiment Videos

Protection hypothesis for composite wear.

S C Bayne1, D F Taylor, H O Heymann

  • 1Department of Operative Dentistry, School of Dentistry, University of N. Carolina, Chapel Hill.

Dental Materials : Official Publication of the Academy of Dental Materials
|September 1, 1992
PubMed
Summary
This summary is machine-generated.

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Composite restorations experience wear even without tooth contact, explained by the "protection hypothesis." Microfiller particles, when not agglomerated, require minimal volume for wear resistance, but agglomeration necessitates higher filler content.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Tribology

Background:

  • Posterior composite restorations exhibit significant occlusal wear, including contact-free wear.
  • The

Purpose of the Study:

  • To calculate the minimum inter-particle spacing (IPS) for microscopic wear protection in composites.
  • To evaluate the impact of filler particle dispersion versus agglomeration on wear resistance.

Main Methods:

  • Theoretical calculation of IPS based on packing fractions and particle size.
  • Modeling dispersed versus agglomerated filler particle conditions.
  • Assumed an inter-particle spacing (IPS) of < 0.10 microns for wear protection.

Main Results:

Related Experiment Videos

  • Theoretically, 1.5-6.0% microfiller volume is sufficient for microscopic protection with dispersed particles.
  • Agglomeration of microfiller particles significantly increases the required filler content.
  • At least 35% filler is theoretically required to provide microscopic protection when particles agglomerate.

    • Conclusions:

    • The