Скачать или смотреть Manipulation of Heat Cure Acrylic Resin

HEAT CURE ACRYLIC RESIN

ACRYLIC RESIN
Any of a group of thermoplastic resins made by polymerizing esters of acrylic or methyl methacrylate acids.

COMPOSITION

POWDER:
Polymethyl methacrylate.
Initiator- benzoyl peroxide.

LIQUID:
Methyl methacrylate monomer.
Inhibitor -hydroquinone.
Polymer - Monomer Ratio 3:1 by volume

STAGES OF POLYMERISATION
1. Wet/sandy stage
2. Stringy stage
3. Dough stage
4. Rubbery stage
5. Stiff stage

WORKING TIME:
The dough to remain moldable for atleast 5 minutes.(The working time of the resin may be extended by refrigeration)

ADVANTAGES:
1.Biocompatibility
2.Dimensional stability
3.Resistance to weak acids and bases
4.Processing ease
5.Tissue compatibility

DISADVANTAGES:
1.Low abrasion resistance
2.soluble in organic solvents
3.Low thermal conductivity
4.Impact fracture