Use Of Agar As A Dental Impression Material
The lamination technique is also known as the agar-alginate combination technique.
- In this technique, a syringe type of agar is loaded in a cartridge, and alginate of the regular type is mixed and placed on a stock tray.
- The syringe agar is injected around the preparation.
- The cooled alginate is seated on the top of the agar.
- Alginate sets in about 3 minutes and agar gels within this time as a result of being cooled by the alginate.
- During setting of alginate and gelling of agar, a bond forms between them. When the tensile strength is between 600 to 1100 g/cm the bond is better.
- The impression is removed in about 4 minutes. The surface of the impression is in agar and the base of the impression is in alginate.
- Accuracy is good for an agar-alginate impression
Advantages of the Lamination Technique
- The syringe of agar produces better results than alginate.
- Fewer air bubbles
- Water-cooled trays are not needed so it is more convenient.
- It sets faster than the regular agar technique.
Impression Materials Agar And Alginate
Difference between irreversible and reversible hydrocolloid:
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