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