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This Concept Map, created with IHMC CmapTools, has information related to: elijah part copy, with a firm, quick snap in a direction nearly parallel to the long axis of the teeth, pressure will cause impression to set under strain and upon removal from mouth these strains will be released, causing distortion and an inaccurate cast, IRREVERSIBLE HYDROCOLLOID Disadvantages poor surface detail, Criteria for Undistorted Impression during Selection of Impression Tray, Criteria for Undistorted Impression during Impression Taking, Removal should be 2 to 3 minutes after gelation, Selection of Impression Tray should be perforated, patient has high palatal vault then tracing stick compound can be used in the center of the maxillary tray, tracing stick compound can be used in the center of the maxillary tray to reduce the bulk of alginate impression material, Impression Taking tray should be centered in position in the mouth, Selection of Impression Tray if there are existing FPDs, Impression Taking pressure should be released when tray is seated, Mixing and Loading when loading tray must be filled up to the tray borders, IRREVERSIBLE HYDROCOLLOID Advantages straightforward technique, teeth are missing in one posterior quadrant then modeling compound is softened in a water bath and placed in the tray, IRREVERSIBLE HYDROCOLLOID Advantages low cost, Criteria for Undistorted Impression during Mixing and Loading, IRREVERSIBLE HYDROCOLLOID Advantages rapid set, alginate adhesives can be used because it overcomes displacing forces during withdrawal of the impression, modeling compound is softened in a water bath and placed in the tray to make an impression of the edentulous areas