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This Concept Map, created with IHMC CmapTools, has information related to: copy question mark copy period, poured immediately to produce casts of excellent dimensional accuracy and acceptable surface detail, factors to insure accurate impression should have bulk of material as much as possible, alginate adhesives can be used because it overcomes displacing forces during withdrawal of the impression, the weight of the impression acts directly on the unsupported material leading to anteroposterior distortion of the cast, CRITERIA FOR UNDISTORTED IMPRESSION During RELAXATION, PREPARATION where there is Tray selection, patient has high palatal vault then tracing stick compound can be used in the center of the maxillary tray, a definite snap in a direction nearly parallel to the long axis of the teeth, radiopaque determine exact location, CRITERIA FOR UNDISTORTED IMPRESSION ???? DISINFECTION, IRREVERSIBLE HYDROCOLLOID Disadvantages poor accuracy, removal from undercut reason less stiff, Custom Resin Tray must have Stops on occlusal surface teeth, special conditioning unit consisting of three thermostatically controlled water baths, Criteria for Undistorted Impression during Selection of Impression Tray, CRITERIA FOR UNDISTORTED IMPRESSION During PREPARATION, Criteria for Undistorted Impression material preparation ensure no moisture, impression must be removed with a definite snap because hydrocolloids exhibit greater tear strength when stressed rapi, POLYSULFIDE POLYMER Disadvantages stability only fair, relatively easier to pour easier removal from undercut