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This Concept Map, created with IHMC CmapTools, has information related to: Impression 2- MAAYOS NA VERSION, Criteria for Undistorted Impression during Storage and Disinfection, excellent dimensional stability even when pouring is delayed for prolonged periods of time, Criteria for Undistorted Impression during Cast Fabrication, Factors to ensure accurate impression Immediate Pouring, REVERSIBLE HYDROCOLLOIDS Advantages low material cost, IRREVERSIBLE HYDROCOLLOID ???? Criteria for Undistorted Impression, ensure no moisture to prevent creases and voids in the impression, for water to rise to the highest point resulting in faulty, very soft cusps on the model, POLYETHER Properties stiff material, Selection of Impression Tray if patient has high palatal vault, Model duplication of Partial Dentures, special conditioning unit consisting of three thermostatically controlled water baths, nearly parallel to the long axis of the teeth because hydrocolloids exhibit greater tear strength when stressed rapidly, radiopaque determine exact location, Criteria for Undistorted Impression during Removal, Cast Fabrication stone should be allowed to set in trays with the teeth down, POLYSULFIDE POLYMER Disadvantages unpleasant odor, IRREVERSIBLE HYDROCOLLOID Disadvantages poor surface detail, covered with damp gauze and left in a zip-lock plastic bag for 1 hour until the cast is poured to to achieve maximum strength, there are existing FPDs then pontics require to be blocked out with wax