Impression trays come in various shapes and sizes and are used in a variety of ways. One typical use is by a dentist to take an impression; a mould of a patient's real teeth.
From the impression a plaster "cast", or model, can be produced. The mixed plaster, or dental stone as it is known, is poured into the impression mould and allowed to set. The resultant cast model is then prepared, depending upon what function it is intended to perform. E.g. It may be a working model or study model; they perform many functions.
In this example the finished cast model, with its sectioned dies, has been sent to be "Die Trimmed". The final product is a working model, prepared, trimmed, sectioned and pinned*; ready for the bench.
* We use the Coltene Whaledent "Pindex® system" for pinning dies. The pins act as locators, and slot into holes drilled into the base
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Impression tray
They come in various shapes and sizes.
Impressions
Impressions are a mould of a patient's real teeth.
Disinfecting impressions
Impressions are disinfected prior to being handled for hygiene and safety.
Mixing dental plaster
Dental stone (plaster powder) is mixed with water using a vacuum mixer.
Casting a model
Mixed plaster is poured into the impression mould to form a cast. The resultant model is then trimmed to remove excess plaster, then mounted on a plaster or plastic platform.
Two models are cast
Two impressions are cast as both sides of the jaw have to be cast. This is done so that a bite registration can be made.
Pin placement
An Amann laser guided pin drill is used to place Pindex® pins in the models base. The model can then be sectioned; the pins act as both a locating mechanism and help support the sectioned die.
Example of a cast model
Here is a working model, prepared, trimmed, sectioned and pinned.
