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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...

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Published on: January 17, 2017

Surface integrity of solvent-challenged ormocer-matrix composite.

Larissa Maria Cavalcante1, Luis Felipe J Schneider, Nick Silikas

  • 1Biomaterials Research Group, The University of Manchester, School of Dentistry, UK. lara cavalcante@yahoo.com.br

Dental Materials : Official Publication of the Academy of Dental Materials
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

The experimental ormocer-based material demonstrated superior surface integrity and resistance to solvent degradation compared to commercial dimethacrylate-based composites. Light exposure modes did not significantly impact surface hardness in this study.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Ormocer (organically modified ceramic) matrix composites offer potential advantages over traditional dimethacrylate-based materials.
  • Understanding the surface integrity of dental composites under various conditions is crucial for clinical longevity.
  • Light-curing protocols can influence the physical properties and durability of dental restorative materials.

Purpose of the Study:

  • To evaluate the surface hardness and integrity of ormocer-matrix composites after solvent challenge.
  • To compare the performance of an experimental ormocer material with commercial dimethacrylate-based composites.
  • To investigate the effect of different light exposure modes on the surface properties of these materials.

Main Methods:

  • Knoop hardness testing was performed on disk specimens of an experimental ormocer (ORM), a mixed ormocer-ADR, and two dimethacrylate composites (GRD, PRE).
  • Materials were light-activated using standard (S) or soft-start (SS) protocols.
  • Specimens were stored dry, in distilled water, or in absolute ethanol for 7 days before hardness measurements.

Main Results:

  • Light exposure mode did not significantly affect immediate or 7-day post-storage hardness.
  • All materials showed decreased hardness after water and ethanol storage, with ethanol having the most significant effect.
  • The experimental ormocer (ORM) exhibited the lowest percentage hardness change, indicating better resistance to solvent degradation.

Conclusions:

  • Surface integrity and hardness of tested composites are not significantly affected by light exposure mode.
  • The experimental ormocer-based material demonstrated superior resistance to solvent challenge and better surface integrity compared to commercial ormocer and dimethacrylate composites.
  • Ormocer-based materials show promise for improved durability in challenging oral environments.