Plaster of Paris Cast Application
First of all stockinette is applied over the area to be plastered and covered by soft cotton padding of the required width firmly over the area.
For securing, each turn is overlapped by one third in order to secure layers.
The patient is settled in comfortable position with clothing protected. The equipment is readied [water in bowl bandages]
The affected part should covered with suitable padding and the desired position secured and held correctly. Bandages of the correct size are immersed in water, one at a time, and held there until bubbling stops. The bandage is removed by holding it at the ends. The ends are gently squeezed towards the center then pulled back to shape.
The bandage is unrolled around the limb in an even manner. Minimum tension should be exercised and this should be directed towards the center of the bandage-not at the edges.
Molding of the bandages to the contours of the limb should be done by constant smoothing with the palms of the wet hands.
When the required thickness has been obtained, the extremities of the plaster of Paris cast may require trimming to ensure that a free range of movement is possible at joints which are not immobilized. The completed wet cast is handled carefully and supported correctly to protect it from damage.
The cast does not fully dry out until 36 to 72 hours after application.
When a dry plaster of Paris cast is tapped with the knuckles, it gives a crisp, clear sound, but the damp cast gives a dull sound.
Video of Plaster of Paris Cast Application
A video describing application of plaster of Paris cast is shown below.
A slab is prepared When the required length and width have been decided, the slab is lightly folded from each end to the centre. It is immersed in water immediately removed, then carefully and quickly smoothed on the flat surface. The layers must be pressed together and the bubbles excluded. If this is not done, the layers become brittle when dry and can separate.
Plaster of Paris may be used for making plaster slabs or removable splints. These fit the part exactly and are light to wear and easier to apply than many of the traditional splints.
Any complete plaster of Paris cast can be converted into a removable splint by bivalving it.
If a cast has been bivalved to facilitate daily dressing of a wound, and immobilization has to be continued, the anterior and posterior sections are both preserved and are held in place by a firm bandage.
Plaster slabs are applied as follows
Plaster Slab Application
Slabs can be prepared by unrolling a plaster bandages to a required length or by withdrawing the required length of layers from a plaster dispenser. This may be done with either wet or dry bandages which are folded out on a smooth surface. This average thickness of slabs for strengthening is 12-16 layers. The thickness might be adjusted from patient to patient.
When using bandages care must be taken to see extends for the same distance. Short ends should be discarded because they cannot be held securely when the slab is immersed in water. Slab can be prepared in any width, depending on the needs of the situation. Sometimes a slab is used for initial immobilization and is completed later. Slabs must be smoothed carefully on a flat surface after they have been soaked.
Plaster of Paris casts become supportive in three to five minutes, depending on the water temperature and the thickness of the cast.
Video of Plaster of Paris Slab
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