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Residues of polyether adhesive, alginate, and autopolymerising acrylic resin on impression trays and other items (alginate spatula, laboratory bur, silicone dappen dish) after treatment by washer-disinfectors (a, b) and corrosion of impression trays by an improper or overly long chemical treatment to remove gypsum (c-f). Tips: (i) remove residues before treatment by washer-disinfectors (a, b) [17]; (ii) these impression trays must be promptly substituted (c-f).
