What is polyvinyl siloxane impression material?

What is polyvinyl siloxane impression material?

Polyvinyl siloxane impression materials have applications in a variety of indirect procedures in prosthodontics and restorative dentistry. Favourable handling properties, good patient acceptance and excellent physical properties have resulted in their popularity in today’s practice.

Is polyvinyl siloxane silicone?

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

Is polyvinyl siloxane hydrophobic?

Polyvinyl siloxanes are hydrophobic because of their chemical structure. They contain hydrophobic aliphatic hydrocarbon groups around the siloxane bond . Polysulfides and polyethers are more hydrophilic.

What is the difference between polyether and polyvinyl siloxane?

Polyethers are known for their hydrophilic properties and good flowability. Polyvinyl siloxanes, on the other hand, are known for their excellent elasticity, high tear strength, and stability. The decision to use one over the other varies among clinicians and is based on personal preference.

What is PVS used for?

[1] The most popular elastomer used in the dental practice today is the polyvinyl siloxane (PVS). PVS impression materials have low dimensional change, low creep, and relatively short setting time, have moderate to high tear resistance.

What type of impression material is alginate?

Alginate is an elastic, irreversible hydrocolloid impression material. Irreversible hydrocolloid impressions form an inseparable part of indirect restorations.

What is condensation type silicone?

Condensation silicone is a type of silicone that forms as a result of a condensation reaction. Usually, condensation silicones come in two pastes. The first paste is named the base paste and consists of polydimethyl siloxane along with fillers and color pigments.

Is pvs hydrophobic or hydrophilic?

All unset PVS materials were very hydrophobic initially but showed [Show full abstract] In contrast, the unset polyether was more hydrophilic initially but lacked distinct hydrophilization. All impression materials showed statistically significant contact angle differences between unset and set surfaces (P <.

Which impression materials are hydrophilic?

In contrast to addition silicone impression materials, polyether impression materials are hydrophilic, with a high affinity to surfaces such as tooth and soft tissue. Polyether materials have intrinsic hydrophilicity compared to the hydrophilicity produced by adding surfactants to the impression material.

Is polyether more accurate than PVS?

The polyether material proved to be the most reliable in terms of predictability. The impression plaster displayed cumulative distortion, and the PVS putty with light body showed the least reliability.

What is the PVS?

A persistent vegetative state (PVS) or post-coma unresponsiveness (PCU) is a disorder of consciousness in which patients with severe brain damage are in a state of partial arousal rather than true awareness.

What is PVS technology?

Citrix Provisioning Services (Citrix PVS) is a streaming technology that delivers software patches, updates, and other configuration data to multiple endpoints running virtual desktops through a shared desktop image.

What are the different types of impression material?

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.

Which is better addition or condensation silicone?

The most significant difference between types of silicone was that condensation silicones produced significantly shorter dies (-0.24% to -0.37%) than addition silicones (-0.08%). Among addition silicones, Cinch produced more than twice as much vertical change (-0.16%) than the other three products (-0.06%).

What is the difference between extra silicone and condensation silicone?

Addition silicones and condensation silicones are two types of impression materials. The key difference between addition silicone and condensation silicone is that addition silicone forms from an addition chemical reaction, whereas condensation silicone forms from a condensation chemical reaction.

What is impregum used for?

These impression materials can be used for Inlay/onlay, crown and bridge preparations, functional impressions, and implant impressions. I personally use them for inlay/onlay and crown and bridge preparations only.

Which elastomeric impression material is hydrophilic?

Polyether
Polyether is the only material that is truly hydrophilic; it exhibits the lowest contact angle, during and after setting.

Which impression material has the best wettability?

Polyether impression materials
Polyether impression materials were superior in wettability to the other elastomeric impression materials tested.