What is elastomeric impression material?

What is elastomeric impression material?

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 the different types of elastomeric impression 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.

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 advantages of elastomeric impression materials?

Advantages: short working & setting time. proven accuracy. adequate tear strength.

How is an elastomeric material supplied?

In which three ways are elastomeric materials supplied? Elastomeric material comes in light-bodied material (syringe-type or wash type), regular and heavy-bodied material (tray-type).

How do you store elastomeric impression materials?

Despite the lack of standardization among the studies, this review supports the following recommendations to control the dimensional stability: impressions should be stored at temperatures between 21 +/- 2 degrees C; polyether impressions should be stored in an environment with a relative humidity below 50%; time until …

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.

How are elastomeric impression materials dispensed?

Currently, elastomeric impression materials are supplied for three modes of mixing: hand mixing, static mixing, and dynamic mechanical mixing (Figure 8-8). FIGURE 8-8 Mixing systems. A, Hand mixing. Two equal lengths of the material are dispensed on the mixing pad with the mixing spatula.

Which impression material is the stiffest?

Polyethers tend to be the most rigid impression materials . Polyvinyl siloxanes are fairly stiff, and depending on the viscosity of the material, they flow readily to capture areas of detail .

What is addition silicone?

An elastic final impression material used to construct cast restorations, dental prostheses, and other appliances. It is made from a vinyl polysiloxane paste mixed with a platinum salt catalyst.

What is elastomer used for in dentistry?

Purpose. Addition silicone impression material is generally used as a “final impression material” for the fabrication of crowns and bridges. Dental hygienists may (or may not) take this type of impression depending on their state practice act.

What are the components of elastomeric impression materials?

11.  Regardless of type all elastomeric impression materials are supplied as two components system. i.e. Base and Catalyst  Light and regular body materials supplied in cartridges to be used with auto mixing tips and dispensers.  Putty consistency is supplied in jars. 12. POLYSULFIDE RUBBER IMPRESSION MATERIAL

What are the advantages and disadvantages of impression material?

ADVANTAGES DISADVANTAGES  Controlled working time  Excellent properties  Ease of cold disinfection without loss of quality.  The impression material is also compatible with gypsum and silver or copper metallizing baths  Need special transparent trays  Difficult to cure in remote area 60 61.

What is the tear strength of elastomer?

• Tear strength – 6000 to 7500 gm/cm2 (Highest among elastomers) • Other properties are similar to addition silicone. • Both light body and heavy body are cured with visible light having larger diameter probe.

Which impression technique is best for Surface Detail Reproduction?

81.  Giuseppe Varvara et al, conducted an invitro study on Evaluation of defects in surface detail for monophase, 2- phase, and 3-phase impression techniques  They concluded that the 3-phase, 2-step impression injection technique provides improved defect-free reproduction of detail, showing fewer defects than other impression techniques.