Lec 2 Classifications of Composites Flashcards
4 classifications based on filler particle size.
- Macrofill/Conventional
- Microfill
- Hybrid
- Nanofill
Average particle size is 8um.
Macrofill
Rough surface structure strontium and barium glass (radiopaque).
Macrofill
Contains 70-85% inorganic fillers.
Macrofill
Contains 35-60% inorganic fillers.
Microfill
Contains 75-85% inorganic fillers.
Hybrid
Not very polishable and is prone to staining.
Macrofill
Polishable and has smooth lustrous surface similar to tooth enamel.
Microfill
Particle size = 0.01-0.04um
Microfill
Particle size = 0.005-0.01um
Nanofill
Particle size = 0.4 - 1um.
Hybrid
Nanoparticulates are referred to as ______; while macroscopic sample materials are referred to as ______.
Fillers; Matrix
Its physical properties are superior.
Hybrid
The predominant direct esthetic resin and have universal clinical applicability.
Hybrid
Combines properties of conventional and microfill.
Hybrid
Wear resistant and has lower modulus elasticity, allowing the restoration to flex.
Microfill
Has higher resin content, resulting in increased coefficient of thermal expansion and lower strength.
Microfill
2 classifications based on viscosity.
- Packable
- Flowable
More viscous; thicker, stiffer feel.
Packable
Used for small Class I cavities, pit and fissure sealants, marginal repairs, and liners.
Flowable
Has a feature that prevents sliding of filler particle by one another.
Packable
Easier for proximal contact restorations; similar to handling of amalgam.
Packable
Has lower viscosity and lower filler content.
Flowable
Has inferior physical properties (lower wear resistance & strength)
Flowable
