A method of producing an impression of a portion of an object comprising: Such omnidirectional hydraulic pressure produces a highly detailed final impression from which a high-quality model (e.g., cast) can be made.ฤก. The base impression creates a seal around the structure(s) of interest (a closed system), thereby producing omnidirectional hydraulic pressure on the low-density material. A wash impression is then taken using a low-density impression material. The base impression is removed and all fine structure surrounding the structure(s) of interest is ground out. The base impression is taken with an excess of a high-density impression material which is positioned to extend beyond the structures of interest (of which the impression is being taken). ![]() In an exemplary embodiment, a method of creating an impression of structures of the human oral cavity comprises: preparing impression trays creating a first, or base, impression grinding out portions of the base impression and using the void(s) in the ground out base impression to take a second, or wash, impression.
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