dental mat-definitions ch 14

POSITIVE replicas of the teeth produced from impressions that create a negative representation of the teeth; commonly called study models and used for diagnostic purposes and numerous chairside and lab procedures

an imp of the occ relationship of opposing teeth in centric occ.

glue-like material composed of 2 or more substances in which one substance does not go into solution but is suspended within another substance; it has at least two phases, a liquid phase called sol and a semisolid phase called a gel

a WATER-based COLLOID used as an elastic imp material

an agar imp material that can be heated to change a gel into a fluid sol state that can flow around the teeth, then cooled to gel again to take an imp of the shapes of the oral structures

an alginate imp material that is mixed to a sol state and as it sets converts to a gel by a chemical reaction that IRREVERSIBLy changes its nature

a powder derived from seaweed that is a major component of reversible hydrocolloid

LIQUID state in which colloidal particles are suspended; by cooling or chemical reaction, it CAN CHANGE INTO A GEL

a SEMISOLID state in which colloidal particles from a framework that traps liquid (e.g. jello)

the property of a material to have two different temps for melting and solidifying, unlike water, which has one temp for both

a characteristic of gels to contract and squeeze out some liquid that then accumulates on the surface

a versatile irreversible hydrocolloid that is the MOST USED IMP MATERIAL IN THE DENTAL OFFICE; it LACKS the accuracy and fine surface detail needed for imp for crown and bridge procedure

highly accurate ELASTic imp materials that have qualities similar to rubber; they are used extensively in indirect restorative techniques, such as crown and bridge procedures

the act of absorbing moisture

a chemical that lowers the SURFACe tension of a substance so it is more readily wet; for example oil beads on the surface of water, but soap acts as a surfactant to allow the oil to spread over the surface

an elastic imp material that has SULFUR-containing (mercaptan) functional groups; it has been referred to as rubber base imp material

a SILICONE rubber imp material that sets by linking molecules in long chains but produces a liquid-by product by CONDENSATION

a SILICONE rubber imp that also sets by linking molecules in long chains but produces NO BY-PRODUCT; the MOST COMMONLY used addition silicones are they polyvinyl siloxanes (PVS)

very accurate addition to silicone elastomer imp material; it is used extensively for crown and bridge procedures because of its accuracy dimensional stability, and ease of use

a rubber imp material with ETHER functional groups; it has a high accuracy and is popular for crown and bridge procedures

an IMP material composed of resin and wax with fillers added to make it stronger and more stable than wax

an IMP material composed of gypsum product similar to PLASTER of Paris

a hard and brittle imp material used in complete denture procedures

which materials are used for crown and bridge procedures? (3)

which material is not recommended for use of a crown and bridge impression?