composites

Question 1

Dental composite

Answer 1

Highly crosslinked polymeric materials reinforced by a dispersion of amorphous silica, glass, crystalline, mineral, or organic resin filler particles and/or short fibers bonded to the matrix by a coupling agent. In dentistry, it is often called just “composite.”

Question 2

Types of composites; Based on filler particle size (Willems 1993)

Answer 2

 Fine Particle size > 3 µm
 Ultrafine Particle size < 3 µm
 Microfine Average particle size — 0.04 µm
 Nano Nano range (5–100 nm or 0.005–0.01 µm)

Question 3

Uses of composites

Answer 3

1. Restoration of anterior and posterior teeth (directly or indirectly).
2. To veneer metal crowns and fixed partial dentures (prosthodontic resins).
3. To build-up cores (post core).
4. Bonding of orthodontic brackets, etched cast restorations, ceramic crowns, posts, inlays, onlays and laminates.
5. Pit and fissure sealant.
6. Esthetic laminates.
7. Repair of chipped porcelain restorations.

Question 4

oligomer

Answer 4

An oligomer is a moderate molecular weight organic molecule made from two or more organic molecules.

Question 5

resin

Answer 5

Blend of monomers and/or macromolecules with other

components that form a material with a set of useful properties.