What kind of impression wax is used for edentulous impressions?
Inelastic impression materials, such as ZOE and plaster, are ideal for making impressions of edentulous jaw structures or soft tissue because they do not compress the tissue during seating of the impression tray. Impression compound is often used to make trays for the construction of full dentures.
What other impression materials may be used for edentulous ridges?
There are essentially five types of materials used as final impression materials for edentulous cases: alginate, polyvinyl siloxanes, polyethers, rubber base, and zinc oxide eugenol pastes.
What material is normally used to take an impression for a special tray for an edentulous patient?
An elastic material such as alginate or silicone will allow removal from undercuts—for example, around the necks of the teeth, under bridge pontics, and undercuts associated with parts of the edentulous ridges. They will also record with sufficient accuracy and, in most cases, detail.
Can alginate be used for edentulous patients?
Alginate is the material of choice for making preliminary impressions for edentulous patients. However, because of its high viscosity and its ability to displace tissues, it is not recommended for use as a final impression material for complete denture construction [8].
What is polyether impression material?
Polyether impression material is an elastic-type material, as are the polysulfide and silicone materials. These materials have demonstrated good accuracy in clinical evaluations and are thixotropic, which provides good surface detail and makes them useful as a border molding material.
Why impression compound is used for edentulous?
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 the difference between polyether and polyester?
Both polyester and polyether urethanes perform well at high temperatures. But polyesters are better able to withstand high temperatures longer and are more resistant to heat aging. Polyethers are less susceptible to dynamic heat build-up.
When do you pour polyether impressions?
Polyether impressions can be poured anytime within 14 days after they have been made if stored properly.
What are the three types of impressions?
Impressions fall into three basic categories: patent, latent, and plastic. Plastic impressions are three-dimensional imprints. These impressions can be left in soft materials such as snow, mud, soil, or soap. Depending on how it is made, impression evidence may be either class evidence or trace evidence.
What is polyether impression material used for?
Polyether Impression. Polyether materials are used to get very accurate impressions mostly during procedures for dental restorations. There are many different brands and techniques available on the market. Restorations such as crowns, bridges, inlays, and onlays require very precise impressions.
Is polyurethane a polyether?
There are two primary types of polyurethane – polyester, and polyether. Both are useful in a multitude of industrial applications. Both are urethane elastomers.
What is a polyether impression material?
How do you choose an impression material?
It is preferable that an impression material is easy to mix and handle with, ideally, a long working time and a short setting time. The working time of a material is typically determined by the room temperature and the setting time by the temperature and moisture in the oral cavity.