Article No : sjdor-v1-1002
Yusur Amer Jalal

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]. An impression material made of liquid or semi-solid nature is first mixed and placed in the mouth, then 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. An impression tray is a device like a bowl which holds and supports the impression material until the casting completed. The main types of impression trays are the stock trays and the special trays [1,2].

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