Dental Materials

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 laboratory procedures

an impression of the occlusal relationship of opposing teeth in centric occlusion

glue like material composed of two 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 a sol and a semisolid phase called a gel

a water based colloid used as an elastic impression material

an agar impression 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 make an impression of the shapes of the oral structures.

an alginate impression 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 driven 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 colloid particles form a framework that traps liquid

the property of a material to have two different temperatures for melting and solidifying, unlike water, which has on temperature for both

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

a versatile irreversible hydrocolloid that is the most-used impression material in the dental office; it lacks the accuracy and fine surface detail needed for impressions for crown and bridge procedures

highly accurate elastic impression materials that have qualities similar to rubber they are used extensively in indirect restorative techniques such as crown and bridge procedures

act of absorbing moisture

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

an elastic impression material that has sulfur containing (mercaptan) functional groups; it has also been referred to as rubber base impression material

a silicone rubber impression material that sets by linking molecules in long chains but produces a liquid by product by condensation

a silicion rubber impression that also sets by linking molecules in long chaings but produces no by product; most commonly used are polyvinyl siloxanes

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

a rubber impression material with ether functional groups it has high accuracy and is popular for crown and bridge procedures

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

an impression material composed of a gypsum product similar to plaster of Paris

a hard and brittle impression material used to complete denture procedures