Impression Tray for Impression Materials in Dentistry

Watch Dental Video about Impression Tray

Impression trays are used to carry impression materials when dental impressions are taken.

We distinguish between two types:

  • prefabricated impression trays
  • and individualized impression trays

The prefabricated trays are factory-made impression trays made of metal or plastic materials and come in a host of different shapes (for toothed, partially toothed, and toothless jaws). With individualized trays, the dental technician produces an individual impression tray customized to your jaw. In order to do this, a pre-impression is initially taken with a prefabricated tray. This provides the technician with a rough overview of your jaw, from which he can produce the individual tray. This is helpful in case of difficult jaw conditions (large/small jaws, after tumor surgeries, etc.).

The mechanical retentions between the tray and the impression material are achieved through various forms and holes. However, before inserting the impression material, a bonding agent should always be applied as well, in order to prevent the finished impression from detaching from the tray. Although this complicates cleaning the trays, it results in less distortion of the impression compound. Impression distortions may lead to a leaking dental prosthesis.

Impression Trays

Impression Trays

In order to economize impression material, impressions are often only taken in certain parts of the jaw. The impression tray is either not completely filled with impression compound or only partial trays are used from the outset. Partial trays are imprecise because the plaster models can’t be clearly aligned with one another. When partial trays are used, the technician receives partial models; these are pivoted relative to one another and thus can’t be positioned clearly. The dental prosthesis cannot be molded accurately.

A complete impression results in complete jaw models and thus, in a so-called three-point contact. Therefore, the models can’t be swiveled. Only under these conditions is the technician able to produce an exact- fitting dental prosthesis.

Click here to see the video: Impression Tray

 

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