What is polysulfide impression material?
Permlastic is a polysulfide, condensation-cured, elastomeric impression material in three viscosities. Regular Permlastic is recommended for partial- or full denture impressions because it has a high degree of flow that will register the finest detail.
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 is elastomeric impression?
Elastomeric Impression Materials. Elastomers comprise a group of synthetic polymer-based impression materials that are chemically cross-linked when set and that can be stretched and yet rapidly recover to their original dimensions, like vulcanized natural rubber when the applied stress is released.
What are elastomeric impressions 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 is the difference between addition 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.
Which elastomeric impression material is best?
Polyether is the only material that is truly hydrophilic; it exhibits the lowest contact angle, during and after setting. Recent studies show that during setting the Polyether hydrophilicity is increased compared to the condition after setting.
What is putty 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.
Why is elastomeric preferred for impressions?
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 is hydrocolloid alginate?
Kendall™ alginate hydrocolloid dressings are sterile wound dressings designed for use on light to moderately exudating wounds. These dressings help provide an optimal moist wound healing environment. The alginate formulation provides greater absorbency helping to reduce the number of dressing changes.
What are the two types of hydrocolloids?
The two common hydrocolloids widely used in dentistry are reversible (agar) and irreversible (alginate) materials.
What is a flux compression generator used for?
Abstract A flux compression generator (FCG) is provided for producing an electromagnetic pulse (EMP). The FCG includes an environmental case, a reactive load, a dielectric core, a superconducting stator, an electric energy source, a load switch, and a transition device.
What is an explosive magnetic flux compressor?
Also known as an Explosive Magnetic Flux Compressor (EMFC) or Flux Compression Generator (FCG), this technology uses the detonation of an explosive to generate power. It’s primary use is to generate an large pulse of current to be employed in directed energy weapons.
What is compression set?
Compression set is the amount of permanent deformation that occurs when a material is compressed to a specific deformation, for a specified time, at a specific temperature. ASTM D395 Standard Test Methods for Rubber Property—Compression Set is the test method used and it calls for the material to be 25% deformed (compressed) for a given period.
What does compression mean?
: the act, process, or result of compressing especially when involving a compressing force on a bodily part compression of an artery by forceps compression of the brain by the bones of a depressed fracture. Keep scrolling for more.