What is an elastomeric impression?

What is an elastomeric impression?

Elastomeric impression materials are in common use. The impression material is inserted into the patient’s mouth in a viscous state and transforms into viscoelastic state, upon withdrawal, influencing the residual deformation. The requirements are minimal residual deformation or maximal elastic recovery.

What are elastomeric impression used for?

The elastic impression materials are most generally used for the making of impressions for removable partial dentures, immediate dentures, and crowns and fixed partial dentures when tooth and tissue undercuts and surface detail must be recorded with accuracy.

What are dental elastomeric materials?

Four basic types of elastomer impression materials are currently in use in the dental profession: (1) silicone rubbers which polymerize by a condensation reaction, (2) polysulfide (mercaptan) rubbers, (3) polyethers, and (4) silicones which polymerize an addition reaction.

Which is an example of elastomeric impression material?

Elastomeric materials include polysulfide, polyether, condensation-cured silicone, and addition-cured silicone. The choice of which impression material to use in each case will depend not only on the specific needs of each case, but also on the impression technique and tray to be used.

What are the different properties of elastomeric impression material?

Elastomeric impression materials (addition silicones and polyethers) offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. Recently, new elastomeric impression materials with very high elastic recovery and high tear strength have been introduced.

Is alginate an elastomeric?

Elastic impression materials can be further divided into hydrocolloid and elastomeric impression. Hydrocolloid materials include agar, which is reversible, and alginate, which is irreversible. Elastomeric materials include polysulfide, polyether, condensation-cured silicone, and addition-cured silicone.

What are the 4 types of viscosities of elastomeric impression compounds?

The flow or viscosity of an impression material is dependent on the filler content. There are four basic categories: low (syringe or wash material), medium (one-step monophasic material), high (tray material), and very high (putty material). Viscosity is important when subgingival margins are to be captured.

What are the different types of elastomeric materials?

There are two primary categories for elastomers: Unsaturated: Sulfur and non-sulfur vulcanization can cure unsaturated elastomers like polybutadiene, chloroprene rubber, butyl rubber, nitrile rubber, synthetic polyisoprene and others.

What are the 4 types of viscosities of elastomeric impression materials?

Why is alginate better than impression compound?

Alginate has many advantages, including: It has a limited working time based on the temperature of the water used and it is available in both standard and fast-setting varieties. It is easily removable. It is easier to use than other impression materials. It has a neutral taste.

What are the 4 types of final impression materials?

There are many materials for the final impression, such as gypsum, zinc oxide and eugenol (ZOE) paste, polysulfide rubber, polyether, polyvinyl siloxane, and alginate. Preferences vary much among dentists. However, there is no evidence that one technique or material produces better long term results than another.

How is an impression compound used in dentistry?

Impression Compound is used to take a negative replica or an Impression of the Edentulous Oral cavity in a process called PRimary Impression. The material is a Reversible type material which means, it can be reused or softened using heat for a limited period of time to capture the perfect impression.

What kind of materials are used for elastomeric impressions?

1) Impression material for all applications including – Fixed partial dentures – Dentulous and edentulous impressions 2) Border moulding of special trays (polyether) 3) Bite registration 4) As duplicating material for refractory casts 8 10.

How to tell if an elastomeric impression has been torn?

25. o Subgingival regions are very thin – material can tear o Residual segment of impression material difficult to detect  radio opacity of polysulfide can help  Severe gingival inflammation. o Examine the gingival sulcus immediately after impression removal and also the impression for any evidence of tearing 25

When did silicone become a dental impression material?

6.  1960s : Polyether impression material developed in Germany  1970s : Addition silicone was introduced as a dental impression material  1988 : Latest addition and light cure elastomers  1990-2000 : New auto devices and delivery systems 6 7.