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DA 160
Alginates, Chapter 35
Question | Answer |
---|---|
Potassium Alginate | Main ingredient, comes from sea kelp (seaweed) and acts as a thickener |
Setting time | Time required for chemical action to be completed and when impression to be removed from patients mouth. |
Working time | Time allowed for mixing, loading trays and positioning in the mouth |
Undercuts | Recessed areas that are wider on the bottom than on top |
Irreversible Hydrocolloid | Material that is not able to return to the sol state after becoming a gel. Like cake mix, once cake is cooked it can't go back to the powder mix |
Single pour | One mix for both portions |
Double pour | Pouring anatomic portion first then the art portion for base. |
Anatomic portion | Natural anatomy portion of negative impression. (teeth, gingival ect) |
Art portion | Base portion of cast; 1/3 overall ht) |
Box method | Creating a secure base/box with wax and pouring plaster into it; 1 mix for both portions |