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What kind of material is the express impression material?


Asked by Selene Richardson on Dec 07, 2021 FAQ



The Express™ Impression Material System, manufactured by 3M ESPE, was the first vinyl poly- siloxane automix system in the U.S. Used in the putty/wash technique, the Express™ STD Putty is easy to mix without streaking while the thixotropic Express wash materials stay on your prepara- tion without slumping.
Besides,
These were replaced by elastic impression materials such as aqueous materials (agar, alginate) and nonaqueous elastomers (polysulfides, silicones, and polyethers) ( Figure 2-33 ). Impression materials are also classified as reversible (compounds and hydrocolloids) or irreversible (silicones, polyethers, and alginates).
Furthermore, – Impression materials set either by a chemical reaction or by a physical change. – Impression materials set by chemical reactions to form elastic rubber materials are called thermoset. – The chemical reaction involves chain lengthening, cross-linking, or both.
In respect to this,
Usually the impression material is carried to the mouth in an unset (plastic) condition in a tray and applied to the area under treatment. When the impression material has set, it is removed from the mouth with the tray. The cast is made by filling the impression with dental stone or other model material.
Likewise,
A variety of impression trays are used to make impressions. Examples of typical impression trays are shown in Figure 12-2. The tray is placed so the material is supported and brought into contact with the oral tissues, then held without movement until the impression material has set.