What are the 4 types of final impression materials?

Four types of elastomeric impression materials are available in the market: addition silicone, also known as polyvinyl siloxanes (PVS), condensation silicone, polyether, and polysulfide. Elastomers can present in different consistencies, including putty, heavy body, medium body, and light body.

What material is used for final impressions?

There are many materials for the final impression, such as gypsum, zinc oxide and eugenol (ZOE) paste, polysulfide rubber, polyether, polyvinyl siloxane, and alginate.

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).

What are the types of dental impressions?

There are three main types of dental impressions — preliminary, final, and bite registration.

What are the three types of impressions?

Impressions fall into three basic categories: patent, latent, and plastic. Plastic impressions are three-dimensional imprints. These impressions can be left in soft materials such as snow, mud, soil, or soap. Depending on how it is made, impression evidence may be either class evidence or trace evidence.

Prosthodontics | Impression Materials | INBDE, NBDE Part II

What are the types of impression materials?

By their composition, the impression materials are divided into three major groups: nonaqueous elastomers, hydrocolloids, and inelastic materials. Elastomers include polysulfide, condensation and addition silicone, and polyether. Hydrocolloids are alginate and agar.

What is hydrocolloid impression material?

Hydrocolloids were the first elastic impression materials available to dentists. When mixed, they form a viscous liquid that can be seated over oral structures. The liquid sets, becoming a gelatin-like solid that is flexible enough to be drawn over undercuts without significant permanent deformation.

What is VPS impression material?

Vinyl Polysiloxane Impression Material (VPS) is a hydrophilic material used for dental and gingiva impressions. VPS enables a dentist to make more accurate impressions that resist distortion and tearing when being removed. This allows for better fitting restorations.

What are the different viscosities of different elastomeric materials?

It is available in 4 viscosities: heavy, medium, light, and putty. Excellent detail reproduction, dimensional stability, and good tear strength are the qualities of elastomeric impression materials that made these materials used when a high degree of accuracy is essential [10].

What are the two basic types of impressions?

there are two basic types of impressions—patent and latent. impressions are always considered class evidence only. before anyone touches or alters an impression, it should be photographed.

What types of materials can be used to take the final impression for a partial denture?

What is the difference between hydrocolloid and elastomeric materials?

HYDROCOLLOIDS: Substances that exist in sol/gel state. It can be converted from sol to gel and the opposite through physical or chemical reactions. The reaction could be reversible or irreversible. ELASTOMERS: Rubber-like polymers that show an elastic behavior at the time of load application.

What is final impressions in dentures?

Making accurate final impression for complete dentures is a multistage process that involves a preliminary impression, a customized final impression tray and a final border impression. It is important to thoroughly examine the patient's mouth and select the most appropriate impression technique.

What is the difference between PVS and VPS?

Polyvinyl siloxane (PVS), also called poly-vinyl siloxane, vinyl polysiloxane (VPS), or vinylpolysiloxane, is an addition-reaction silicone elastomer (an addition silicone).

What is impregum used for?

Impregum Penta Soft is a less rigid, soft polyether impression material used to make dental impressions. This particular product is easier to remove and provides better initial hydrophilicity than other VPS products.

What is alginate impression?

Alginate is an elastic, irreversible hydrocolloid impression material. Irreversible hydrocolloid impressions form an inseparable part of indirect restorations. Alginate is one of the most frequently used dental materials; and alginate impression is a simple, cost-effective, and indispensable part of dental practice.

What is silicone impression material?

Silicone impression material consists of a base and catalyst in a putty consistency. Silicone impressions are classified according to their method of polymerisation on setting. They are available in a range of viscosities including light, medium, heavy and very high viscosity (or putty) material.

What is elastomeric impression materials?

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.

What is polyether impression material?

Polyether impression material is an elastic-type material, as are the polysulfide and silicone materials. These materials have demonstrated good accuracy in clinical evaluations and are thixotropic, which provides good surface detail and makes them useful as a border molding material.

What are the different types of impression materials for fixed restorations?

What are the three curing stages of impression materials?

What is the best impression material?

Elastomeric impression materials (polyethers, polyvinyl siloxanes, and hybrids) are popular impression materials because of their excellent physical and mechanical properties including excellent detail reproduction, high elastic recovery and good dimensional stability.

What does pvs stand for dental?

[1] The most popular elastomer used in the dental practice today is the polyvinyl siloxane (PVS).