final setting time - Answer✔️✔️-from start of mix to rigid mass that can be separated from
impression, minimum 1-hour/safe to separate, not fully set
10 minutes - Answer✔️✔️-disinfection time of alginate impression
syneresis - Answer✔️✔️-Water exudes causing the impression contracts
positive reproduction - Answer✔️✔️-study model/cast of oral structures
hysteresis - Answer✔️✔️-melting point much higher than boiling point, and gelling at
mouth temperature
setting expansion - Answer✔️✔️-the slight swelling of the gypsum while it is getting hard,
crystals push against each other creating porosities
dry strength - Answer✔️✔️-reached in 24-hours, water has evaporated , 2X as great as
wet strength
diatomaceous earth - Answer✔️✔️-silica, inert filler used in alginate; Gives the material
'body'
reversible hydrocolloid - Answer✔️✔️-impression material used for crowns, requires
special equipment, water cooled trays, can be softened and reused
exothermic reaction - Answer✔️✔️-gives off heat as it set or gets hard
Gilmore needle - Answer✔️✔️-device used to determine setting time of gypsum
Hydration - Answer✔️✔️-When mixed with water, the hemihydrate is converted back to
dihydrate
polysulfide material - Answer✔️✔️-rubber base impression material, used for dentures,
special spatula, long working time 4-6 minutes
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