Polyvinyl siloxane

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Polyvinyl siloxane ( PVS ), also called poly-vinyl siloxane , vinyl polysiloxane , or vinylpolysiloxane , is an additional reaction silicon elastomer (additional silicon). It is a viscous liquid that heals (frozen) quickly becomes solid as rubber, takes the form of whatever surface lies when healing. Like two-part epoxy, the packaging stores two liquid components in separate tubes until they are mixed and applied, because once mixed, they heal quickly. Polyvinyl siloxane is widely used in dentistry as an impression material. It is also used in other contexts where impressions similar to dental impression are required, such as in audiology (to take the impression of ears for the installation of a custom hearing shield or hearing aid) or in industrial applications (such as to assist in interior inspection of machine parts features, eg , internal groove in the hole). Polyvinyl siloxane was introduced commercially in the 1970s.

To create the material, the user simply mixes colored putty (often blue or pink) with white putty, and a chemical reaction begins. PVS with various working times and settings commercially available. The last set is recorded when the product bounces after touching with a blunt or sharp instrument.

This reaction also emits hydrogen gas and is therefore recommended to wait up to an hour before pouring the next cast.

In dentistry, this material is usually referred to as having a mild or heavy body depending on the specific use.