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
diagnostic casts
an imp of the occ relationship of opposing teeth in centric occ.
bite registration
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
colloid
a WATER-based COLLOID used as an elastic imp material
HYDROcolloid
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
reversible colloid
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
irreversible colloid
a powder derived from seaweed that is a major component of reversible hydrocolloid
agar
LIQUID state in which colloidal particles are suspended; by cooling or chemical reaction, it CAN CHANGE INTO A GEL
sol
a SEMISOLID state in which colloidal particles from a framework that traps liquid (e.g. jello)
GEL (JELlo)
the property of a material to have two different temps for melting and solidifying, unlike water, which has one temp for both
hysteresis
a characteristic of gels to contract and squeeze out some liquid that then accumulates on the surface
syneresis
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
alginate
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
eLASTomers (they "last" long enough to be sent to a lab)
the act of absorbing moisture
imBIBition (the pt "bib" absorbs 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
surfactant
an elastic imp material that has SULFUR-containing (mercaptan) functional groups; it has been referred to as rubber base imp material
polysulfide
a SILICONE rubber imp material that sets by linking molecules in long chains but produces a liquid-by product by CONDENSATION
condensation silicone
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)
addition silicone
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
polyvinyl siloxane (PVS)
a rubber imp material with ETHER functional groups; it has a high accuracy and is popular for crown and bridge procedures
polyether
an IMP material composed of resin and wax with fillers added to make it stronger and more stable than wax
impression compound
an IMP material composed of gypsum product similar to PLASTER of Paris
impression plaster
a hard and brittle imp material used in complete denture procedures
zinc oxide eugenol (ZOE)
which materials are used for crown and bridge procedures? (3)
elastomers
PVS
polyether
which material is not recommended for use of a crown and bridge impression?