Polymeric filling materials
Polymers are called substance, consisting of long chains of covalently linked repeating units – monomers containing carbon, hydrogen and other elements. In dentistry, used polymers harden for a few minutes at room temperature. It’s easier than essay writing help Filling materials, which are based on polymers, called Polymer filling materials. They all have some similar properties.
The polymers are hydrophobic. When you work with them they should be carefully isolated from the water. The presence of moisture between the tooth and polymer filling material leads to formation of microcracks, the appearance of hypersensitivity, caries and other complications.
Polymers are afraid of contamination. A thin film formed by organic compounds in oral fluid and remaining on the teeth before sealing, can disrupt adhesion.
Polymers possess the polymerization shrinkage. Reducing the amount of filling material during solidification can lead to detachment, the formation of marginal gaps, the emergence of internal stresses in the seal. The main ways to compensate for shrinkage include: strict adherence to the instructions for use of this material, reduction of both portions of curable material, the use of technology designed and slow to cure light-cured polymers.
All polymer filling materials cured by free radical polymerization, or additional.
To enhance the mechanical properties of the organic polymer in the structure of the material may be added inorganic filler. Thus, the polymeric sealing material may be unfilled and filled. Inorganic filler material gives the strength and reduces the polymerization shrinkage, improves abrasion resistance.
