Abstract
A dental impression is a negative print of teeth and soft tissues in the mouth which can produce a positive copy model. It can be made by putting a suitable material in a stock or custom dental impression tray which is designed to fit as possible over the dental arches. Figure 1 shows a dental impression made using alginate impression material [1].
Highlights
An impression material made of liquid or semi-solid nature is first mixed and placed in the mouth, made to become an elastic solid usually in few minutes depending on the material used and leaving an imprint of patient's dentition and the surrounding structures of oral cavity
The shape of stock trays can be rounded in a way to fit the mouths of edentate patients
The main types of stock trays according to the size and shape include [3,4]: 1
Summary
A dental impression is a negative print of teeth and soft tissues in the mouth which can produce a positive copy model. It can be made by putting a suitable material in a stock or custom dental impression tray which is designed to fit as possible over the dental arches. The shape of stock trays can be rounded in a way to fit the mouths of edentate patients. The impression stock tray used should have similar size and shape to the patient's own arch dimensions [3,4]. The main types of stock trays according to the size and shape include [3,4]: Full tray
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