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This Concept Map, created with IHMC CmapTools, has information related to: Sheila - extension copy, ensure no moisture to prevent creases and voids in the impression, Criteria for Undistorted Impression material preparation ensure no moisture, allow 10 minutes to set to allow polymerization, relatively easier to pour easier removal from undercut, pour within 1 hour after removal from mouth, relatively easier to pour easier removal from undercut, dimensional stability greater than hydrocolloid, stability only fair due to curing shrinkage, removal from undercut reason less stiff, POLYSULFIDE POLYMER Advantages high tear strength, Criteria for Undistorted Impression material preparation accelerator paste, POLYSULFIDE POLYMER Disadvantages unpleasant odor, POLYSULFIDE POLYMER recommended use most impressions, POLYSULFIDE POLYMER precautions allow 10 minutes to set, POLYSULFIDE POLYMER recommended use dimensional stability, radiopaque determine exact location, 10-20 minutes to set to allow polymerization, base paste mix changing directions smooth homogenous mixture, POLYSULFIDE POLYMER Disadvantages messy, Criteria for Undistorted Impression ensure accuracy pour within 1 hour