What is the composition of impression compound?
[7] It is made up of three constituents that include resins (e.g., wax), filler (e.g., talc or soapstone) and lubricants (stearic acid or stearin). Two types of impression compounds are available – Type 1 which is low fusing with a fusion temperature of approximately.
What is impression material made of?
Alginate is the most widely used of all the impression materials its is a hydrocolloid material made from seaweed. A hydrocolloid material is a gelatinous substance dispersed in water. It is described as being irreversible as it cannot return to a solution once set.
Is polyether impression material hydrophilic?
Abstract. Polyethers are elastomeric materials commonly used for making precision impressions. They are hydrophilic, which facilitates the contact of the unset material with the intraoral tissue and the wetting of the impression by cast materials.
What is polysulfide used for in dentistry?
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 is the composition of impression compound give their function?
Impression Compound is used to take a negative replica or an Impression of the Edentulous Oral cavity in a process called Primary Impression. The material is a Reversible type material which means, it can be reused or softened using heat for a limited period of time to capture the perfect impression.
What is in alginate impression material?
What Is Alginate Made Of? Alginate is a powder material that contains sodium alginate, calcium sulfate, trisodium phosphate, diatomaceous earth, zinc oxide, and potassium titanium fluoride. When mixed with water, it makes a smooth gel-like consistency that sets firmly enough to mold.
What are the four types of 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.
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 another name for polysulfide material?
Permlastic is a polysulfide, condensation-cured, elastomeric impression material in three viscosities.
What is polyether impression material?
– Polyether impression material was significantly different from the other materials available at that time. – These materials have an ether group in the molecular structure. – An ether group is an oxygen atom that is bonded to two carbon atoms.
What is polyether?
Polyether is an impression material rigid enough to hold the encapsulators and O-rings within the impression when it is removed from the mouth. Polyethers are presented as a base and activator paste of the same viscosity.
What is the history of 3M ESPE polyethers?
Development of 3M ESPE Polyether Products. 3M ESPE introduced Impregum™, its first polyether impressions material for monophase impres- sions, in 1965. Permadyne™, a combined product for the one-step/two-viscosity technique, fol- lowed it in 1980. Until 1993 polyethers were only available for mixing by hand.
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.