Plaster of Paris (POP) Technique
INTRODUCTION
Plaster of Paris (POP) is made from gypsum (hemi hydrated calcium
sulfate powder)and it is the practice for hospitals to make their own plaster
bandages by impregnating wide mesh gauze bandages with dry plaster base. These
are then carefully rolled by hand and used before they get decay storage.
If
the patient can afford the cost all plaster casts are now made from
commercially produced bandages which are supplied in varying widths and are
uniform in their spreading and setting characteristics.
• POP
bandages are reasonably cheap, versatile, widely available and easy to use,
they are comfortable and, being somewhat porous, absorbs perspiration and
secretions.
• The
strength of casts is adequate for most purposes and it is radiotranslucent.
• It
does also have disadvantages and many new materials are currently being
developed as possible substitutes (Resins and Fiberglass).
• Even
when carefully built up to give maximum strength for weight and rigidity, there
can be uncertain immobilization, particularly when POP is applied to a swollen
limb. Finally, it is not waterproof and, for this reason, quickly disintegrates
if allowed to get wet.
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