What are the classification of impression materials?

Classification of Impression Materials

By their composition, the impression materials are divided into three major groups: nonaqueous elastomers, hydrocolloids, and inelastic materials. Elastomers include polysulfide, condensation and addition silicone, and polyether. Hydrocolloids are alginate and agar.

How many types of impression trays are there?

They can be full arch, sectional or quadrant. As the name suggests, the full arch gets an impression from the whole arch, the sectional one only from a certain section in the arch, and the quadrant from a single quadrant in the mouth. Individualized special impression trays are used for a secondary impression.

What are the three classification of impression used in dentistry?

There are three main types of dental impressions — preliminary, final, and bite registration.

What are the two basic types of impression trays?

There are two kinds of full and partial denture trays: trays with perforations, for use with alginate impression materials, and solid, nonperforated trays for use with solid impression materials, such as red compound or fast-set impression plaster No.

What are the types of special tray?

Types of Special Tray Design

Close-fitting special tray. Spaced special tray. Windowed special tray.

What are the three types of custom impression trays?

Impression trays are supplied as quadrant trays, which cover half of the arch; section trays, which are suited for the anterior teeth; and full arch trays, which cover the complete arch.

What is impression tray?

The impression tray is a tool for taking dental impressions of the upper and lower jaw. The impression tray is jaw-shaped and is filled with impression material such as alginate. The tray is then inserted into the patient’s mouth. The patient bites into the impression material, leaving the dental impression.

How do I select impression tray?

Requirements of stock impression trays:
  1. Tray must be rigid. Flexible trays cause distortion of. …
  2. Dimensional stability. …
  3. It should be smooth to avoid injury to oral tissues.
  4. It should provide uniform space for impression material.
  5. It should not distort the vestibular areas.

How do I choose an impression tray?

There are three key factors to consider when selecting impression trays: size, shape and material.
…
Learn more about those characteristics to know how to choose the right type of tray for a dental impression procedure.
  1. Size. Naturally, every patient will have a different sized mouth. …
  2. Shape. …
  3. Material.

What is a tray used for?

Definition of tray

a flat, shallow container or receptacle made of wood, metal, etc., usually with slightly raised edges, used for carrying, holding, or displaying articles of food, glass, china, etc. a removable receptacle of this shape in a cabinet, box, trunk, or the like, sometimes forming a drawer.

What are dental impression trays used for?

Usually made from plastic or metal, dental impression trays hold the impression material while the impression is being created intraorally, and then provide a firm backing to make sure the impression is free of distortions as it finishes setting.

Why do we use special trays?

It is used in making a final impression. Special tray is constructed on the primary cast. As edentulous ridge show variations of shape and size (some have flattened ridges and other have bulky ridge), for this reason stock tray can fit the ridge only in an arbitrary manner, so special tray is constructed.

What is another word for tray?

Find another word for tray. In this page you can discover 29 synonyms, antonyms, idiomatic expressions, and related words for tray, like: plate, coaster, service, tea-wagon, lidded, drawer, carton, rack, bucket, box and pot.

What does the name tray mean?

English: nickname from Middle English trey(e) ‘grief suffering misfortune‘ (Old English trega) or from Middle English tray(e) ‘trick treachery deceit’ (Old French tray).

What is round tray?

A bar tray is a flat, round tray specially designed for carrying glassware. Also known as a waiter’s tray, they are most commonly used by waiters and bar staff. They are circular to help the user balance the tray with one hand while serving and carrying.

What is a salver tray?

A salver is a flat heavy tray of silver, other metal or glass used for carrying or serving glasses, cups, and dishes at a table, or for the presenting of a letter or card by a servant.

What is a serving tray?

There are different uses for serving trays including carrying food and beverages from one place to another as well as enabling those in the industry to serve specific sized portions of food. Some serving trays are used to hold plates and drinks, while other restaurants choose the tray to serve food on.