![]() ![]() In some cases, your doctor may be able to put a waterproof liner under the cast, which makes the entire cast waterproof. While the outer layer is waterproof, the soft padding underneath is not. Synthetic cast consįiberglass casts are much more waterproof than plaster casts, but not completely. This makes the skin underneath the cast less vulnerable to irritation.Īs an added bonus, fiberglass casts weigh less than plaster casts do, and the come in a range of colors. This also means that fiberglass casts are more breathable, making them much more comfortable to wear. They’re more porous than plaster casts, which allows your doctor to take X-rays of the injured area without removing the cast. Synthetic casts offer a lot of advantages over plaster casts for both doctors and the people wearing them. The fiberglass is then soaked in water and wrapped around the area in several layers. A stockinette is placed on the injured area, then wrapped in soft cotton padding. They’re usually made out of a material called fiberglass, a type of moldable plastic.įiberglass casts are applied in a similar manner to plaster casts. Today, synthetic casts are used more often than plaster casts. Plaster casts tend to be heavier as well, so they can pose a challenge to small children. They also take several days to fully harden, so you’ll need to limit your activities for a few days after getting the cast. To bathe with a plaster cast, you’ll need to wrap it in several layers of plastic. For one, they can’t get wet, as this can cause the plaster to crack or disintegrate. Plaster casts require more care than other types of casts. ![]() Compared to other cast types, plaster casts are: While they aren’t as popular as they used to be, plaster casts still have some advantages. Eventually, the paste hardens into a protective case. Next, they’ll wrap several layers of soft cotton around the area before applying the paste. This involves mixing white powder with water to form a thick paste.īefore applying a plaster cast, a doctor will place a stockinette made out of thin, webbed material over the inured area. (vii) It is used in laboratories for sealing air gaps in apparatus so as to make it airtight.Until the 1970s, the most common type of cast was made with plaster of paris. (vi) It is used for making smooth surface and ornate designs on walls and ceilings. (iv) It is used in making blackboard chalks. (iii) It is used in making casts for statues, toys, surgical instruments, etc. (ii) It is used in making toys, decorative materials. (i) It is used for plastering fractured bones and dislocated bones so as to set them in proper place. It has no setting property as it takes up water very slowly. ![]() (iii) When Plaster of Pairs is heated at 473 K, if forms anhydrous calcium sulphate which is known as dead burnt plaster of paris. The setting process may be catalysed by sodium chloride while it can be retarded by borax or alum. The setting process is exothermic, i.e., heat is evolved. (ii) When it is mixed with water, crystals of gypsum are produced and set into hard mass. Heating should be done carefully.at 373 K in a kiln. Preparation : Plaster of Paris is obtained by heating gypsum (CaSO 4.2H 2O) at 373 K in a kiln. It is called Plaster of Paris because it is obtained from gypsum which is mainly found in Paris.
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