![]() It is a synthetic elastomer that is mainly used for crowns, bridges, implants and partial dentures.Ĭondensation silicone can be classified as standard or fast depending on preparation speed. Irreversible- cannot be changed back once setĬ silicone stands for condensation silicone.Some alginate materials change colour when mixing to help with loading and setting times. Pouring with plaster or stone should be done no longer than 10 minutes after setting as alginate is susceptible to imbibition (swelling from absorbing water) and syneresis (shrinking through loss of water) that can distort the impression. This paste takes three to four minutes to set. It comes in a powder form which is mixed with water to form a paste. The most used impression material, alginate is an elastic, irreversible hydrocolloid. Here are the advantages and disadvantages of our four biggest selling impression materials, to help you make an informed decision about how and when they should be used: Alginate These provide an easier flow and tend to be easier to shape.Įlastic impression materials can further be broken down into two groups: hydrocolloids (materials which can turn from a liquid state into a semi-solid state depending on the temperature) and synthetic elastomers (polymer-based impression materials which chemically cross-link when setting). Over 90% of the impression materials we sell at Kent Express are elastic materials. They are useful in specific situations e.g. However they have good accuracy, are economically priced, and are easy to use. In addition if they are deformed, this deformation will become permanent, so the impressions can be easily damaged. ![]() They offer very little elasticity and cannot record the finest detail. Rigid impression materials, such as plaster, impression compound and zinc oxide eugenol (ZOE) impression paste, are rigid when set. The key differentiator between impression materials is whether they are rigid or elastomeric. How are dental impression materials categorised?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |