Reversible hydrocolloid (agar)
By Dr.Swathi Pai
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Thursday, December 11, 2008
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You are here: Home » Prosthodontics Notes » Reversible hydrocolloid (agar)
2 advantages
accurate
low cost
4 disadvantages
low tear strength
single pour only
must pour immediately (no delayed pouring)
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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