COMPOSITE TECHNIQUE SMILE DESIGN COMPANIES/MATERIALS MATERIAL SCIENCE
COMPOSITE CHEMISTRY FILLERS COMPOSITE CLASSIFICATION ENAMEL BONDING DENTIN BONDING HOME
COMPOSITE CLASSIFICATION
Composite is classified by initiation techniques, filler size, and viscosity. Heat cured composites are polymerized by application of heat. Laboratory heat process fillings are processed under nitrogen and pressure to produce a more thorough cure. Self cured composite means chemical initiation converting monomer to polymer takes place. Core build up materials are commonly self cure. Dual cure means chemical initiation is used and combined with photochemical initiation so either and both techniques polymerize composite. Dual cure composite is commonly used as a cementing medium under crowns. Light cured composite means photochemical initiation causes polymerization.
Composite fillers are classified by material, shape and size. Fillers greater than one micron are referred to as macrofills and fillers less than one micron are referred to as microfills. A new classification of filler is the nano particles. The nano particles fill between all other particles to further reduce shrinkage. A mixture of different particle sizes is referred to as a hybrid.
Fillers are irregular or spherical in shape depending on the mode of manufacture. Spherical particles are easier to incorporate into a resin mix and to fill more space leaving less resin. One size spherical particle occupies a certain space. Adding smaller particles fills the space between the larger particles to take up more space. There is less resin remaining and therefore, less shrinkage on curing the more size particles used in proper distribution.
Viscosity determines flow characteristics during placement. A flowable composite flows like liquid or a loose gel. A packable composite is firm and hard to displace.
