What is polyether used for in dentistry?
Polyether impression materials are used for taking impressions when producing dental restorations. Hydrophilic to provide accurate impressions in moist conditions, polyether impression materials come in various viscosities from lightweight/soft to heavyweight and have varying set times.
What is reversible hydrocolloid used for?
Reversible hydrocolloids have been used since 1937 and irreversible hydrocolloids since 1947 for the making of impressions for fixed prostheses; the impression techniques were similar to today’s. The dimensional accuracy of reproduction of the irreversible hydrocolloids has been proved since 1947.
What material is used to make dental molds?
How Dental Impressions Are Made. In order to make a dental impression, a thick liquid material, such as alginate or polyvinylsiloxane, is dispensed into an impression tray that is shaped like a U in order to properly fit into a mouth. Alginate is found within the cell walls of brown seaweeds.
What kind of impression material is PVS?
PVS with a wide variety of working and setting times is available commercially. Final set is noted when the product rebounds upon touching with a blunt or sharp instrument. This reaction also gives off hydrogen gas and it is therefore advisable to wait up to an hour before pouring the ensuing cast.
What type of tray is used for reversible hydrocolloid?
Water-Cooled Impression Trays
Water-cooled impression trays are used with reversible hydrocolloid impression materials. These trays feature an interior lining where cold water can be pumped through in order to properly cool the impression material when capturing an impression.
What type of material is impregum?
polyether impression material
Impregum Penta Soft Medium Body is a medium bodied consistency polyether impression material and is used with the mixing device Pentamix (also manufactured by 3M ESPE). This material is packed in bags that are sealed with a PentaMatic sealing cap.
What is aquasil?
Aquasil Ultra is a quadrafunctional modified siloxane impression material that has superior hydrophilic properties, high tear strength, excellent dimensional accuracy and resistance to deformation.
What are the most popular polyether products?
– Impregum is the most popular polyether product. “Impregum clones.” – The addition silicone clones have the same viscosity, stiffness, and even the purple color as Impregum. – These clones are often called monophase impression materials.
What are the limitations of polyethers in removable partial dentures?
The flow characteristics and flexibility of the polyether materials are the lowest of any of the elastic materials. These characteristics can limit the use of polyethers in removable partial denture impression procedures.
What are the advantages and disadvantages of polyether?
The polyethers are also hydrophilic, which produces good wetability for easy cast forming. The polyethers have low to moderate tear strength and much shorter working and setting times, which can limit the usefulness of the material. The flow characteristics and flexibility of the polyether materials are the lowest of any of the elastic materials.
What is the structure of polyether?
The base paste of a polyether contains inert fillers and polyether polymer chains which terminate in an amine group. These polymer chains are cross-linked by an aromatic sulphonate ester in the activator paste, which also contains inert filler particles.