IBAN: IT36M0708677020000000008016 - BIC/SWIFT:
ICRAITRRU60 - VALERIO DI STEFANO or
570 chapter 61
Casts made of wax
To prepare a mold of a leg for making plastic braces, the first (hollow) cast can be
made of wax instead of plaster. Use either candle wax (paraffin) or beeswax. Wax
can be much cheaper than plaster bandage, especially if the wax is re-used. To make a
wax cast:
1. Melt the wax in
a can placed in
hot water.
can with
wax
pan with
hot water
2. Cut several strips of
soft absorbent cloth.
3. Soak the
cloth in
hot wax.
4. When it has cooled enough
not to burn, wrap the waxed
cloths around the foot.
rope
Note: Before putting
on the wax, you can
cover the foot with
‘stockinette’. Also,
place a rope or strip of
plastic along the top of
the leg to make cutting
the cast easier. (See p. 552.)
5. While the wax is still
warm and soft, rub and
press it against the leg.
6. Hold the foot in
the desired
position until
the wax hardens.
(To speed
hardening, you
can put the foot
in cold water.)
cold
water
7. Cut the wet cast
along the rope, and
carefully remove
it. Go on with the
other steps as
described on p. 552.
Re-using the wax: After the positive plaster mold has been made from the wax cast, the wax can be
re-used. Heat up the pieces of waxed cloth and use them to form a new cast. Or boil the waxed cloth
in water, holding the cloth under the surface with rocks or metal. The hot wax will rise to the surface.
When it cools, lift it off and re-use it.
OTHER POSSIBLE MATERIALS FOR CASTING OR MOLDING
Many materials can be used for casts. Most have the disadvantage that they
take a long time to harden. Possibilities include:
1. Papier mâché (see p. 471). Very slow hardening. Careful use of a heat lamp or ‘hair dryer’
speeds drying.
2. Traditional cast materials. For example:
• In Mexico, the juices of certain plants, boiled into a thick syrup and soaked into a cloth, will harden
into a cast (see Where There Is No Doctor, p. 14).
• In India, traditional bone setters make casts using cloth covered with egg white mixed with flour.
3. Flour made from cassava (manioc) is also used in India to make casts.
To make the solid (positive) mold of a limb (see p. 552), ‘building plaster’ works well. (Wax cannot be
used because it melts when hot plastic is placed over it.) Clay also works, but takes several days to dry.
Disabled village Children
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