Reversible hydrocolloid (agar)

By Dr.Swathi Pai on Thursday 11 December 2008 with 0 comments



2 advantages

  1. accurate

  2. low cost

4 disadvantages

  1. low tear strength

  2. single pour only

  3. must pour immediately (no delayed pouring)

  4. not dimensionally stable (syneresis and imbibition)


Contents:

-12.5% agar: provides for dispersed phase of sol and fibril structure of gel

-1.7% potassium sulfate: counteracts inhibiting effect on setting of

gypsum

-85.5% water: controls flow properties of sol and physical properties of

gel

Category: Prosthodontics Notes

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