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111-507: Harling as a process covers stonework using a plastering process involving a slurry of small pebbles or fine chips of stone. After a wall is complete and has been pointed and allowed to cure then a base of lime render is applied to the bare stone. While this render is still wet a specially shaped trowel is used to throw the pebbles onto the lime surface, which are then lightly pressed into it. Harl, being mostly lime render, cures chemically rather than simply drying. After this setting process,

222-488: A back brace , or in cases of radical surgery to repair an injury or other defect. A body cast that encases the trunk (with "straps" over the shoulders) is usually called a body jacket. These are often very uncomfortable. An EDF (elongation, derotation, flexion) cast is used for the treatment of Infantile Idiopathic scoliosis. This method of treatment for correction was developed by UK scoliosis specialist Min Mehta. Scoliosis

333-618: A bucket of plaster as part of a school art project. Plaster that contains powdered silica or asbestos presents health hazards if inhaled repeatedly. Asbestos is a known irritant when inhaled and can cause cancer, especially in people who smoke, and inhalation can also cause asbestosis . Inhaled silica can cause silicosis and (in very rare cases) can encourage the development of cancer . Persons working regularly with plaster containing these additives should take precautions to avoid inhaling powdered plaster, cured or uncured. Orthopedic cast An orthopedic cast , or simply cast ,

444-401: A cast may be called a cylinder cast. Where the wrist or ankle is included, it may be called a long arm or long leg cast. Body casts, which cover the trunk of the body, and in some cases the neck up to or including the head (see Minerva Cast, below) or one or more limbs, are used less frequently today, and are most commonly used in the cases of small children, who cannot be trusted to comply with

555-425: A detergent agent (such as sodium dodecylbenzene sulfonate ). Plaster may also be used to create complex detailing for use in room interiors. These may be geometric (simulating wood or stone) or naturalistic (simulating leaves, vines, and flowers). These are also often used to simulate wood or stone detailing found in more substantial buildings. In modern days this material is also used for false ceiling . In this,

666-403: A fire. Early versions of protective plasters often contain asbestos fibres, which since have been outlawed in many industrialized nations. Recent plasters for fire protection either contain cement or gypsum as binding agents as well as mineral wool or glass fiber to add mechanical strength. Vermiculite , polystyrene beads or chemical expansion agents are often added to decrease the density of

777-455: A hand-made and pleasing textured alternative to machine-made modern substrate finishes. But clay plaster finishes are rare and fleeting. According to Martin Weaver, "Many of North America's historic building interiors … are all too often … one of the first things to disappear in the frenzy of demolition of interiors which has unfortunately come to be a common companion to 'heritage preservation' in

888-460: A kitchen counter top and their head held over the kitchen sink. The Minerva cast and the Risser cast are used to protect an injured spine or as part of the treatment for a spinal deformity (see scoliosis ), but are seen less frequently today. The Minerva cast includes the trunk of the body (sometimes extending down only so far as the rib cage) as well as the patient's head, with openings provided for

999-523: A large number of famous Scottish buildings including: The word "harling" was used in this sense in building accounts written in the Scots language , possibly deriving from the name of a tool called a "harl". At Falkland Palace , in 1540, John Kelly and John Malcolm alias Callum worked on the "harling" of the chapel (its interior), the tennis court walls, the east turnpike turret, and the Cross House of

1110-467: A lime and sand mortar to provide a weather proof seal to protect from water penetration. This allowed a rendering of clay plaster and setting coat of thin lime and fine sand on exterior-walled rooms. Split lath was nailed with square cut lath nails, one into each framing member. With hand split lath the plasterer had the luxury of making lath to fit the cavity being plastered. Lengths of lath two to six foot are not uncommon at Economy Village. Hand split lath

1221-559: A method of treating fractures that he had observed in Turkey. He noted that gypsum plaster (plaster of Paris) was moulded around the patient's leg to cause immobilization. If the cast became loose due to atrophy or a reduction in swelling, then additional gypsum plaster was added to fill the space. Adapting the use of plaster of Paris for use in hospitals, however, took some time. In 1828, doctors in Berlin were treating leg fractures by aligning

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1332-622: A mixture of suitable plaster, sand, Portland cement and water which is normally applied to masonry interiors and exteriors to achieve a smooth surface. Interior surfaces sometimes receive a final layer of gypsum plaster. Walls constructed with stock bricks are normally plastered while face brick walls are not plastered. Various cement-based plasters are also used as proprietary spray fireproofing products. These usually use vermiculite as lightweight aggregate. Heavy versions of such plasters are also in use for exterior fireproofing, to protect LPG vessels, pipe bridges and vessel skirts. Cement plaster

1443-471: A patient's head and neck, and liquid plaster is used to fill the impression and produce a plaster bust. The transparent material polymethyl methacrylate (Plexiglas, Perspex) is then vacuum formed over this bust to create a clear face mask which will hold the patient's head steady while radiation is being delivered. In dentistry, plaster is used for mounting casts or models of oral tissues. These diagnostic and working models are usually made from dental stone,

1554-454: A plaster positive was desired this would be constructed or cast to form a durable image artwork. As a model for stonecutters this would be sufficient. If intended for producing a bronze casting the plaster positive could be further worked to produce smooth surfaces. An advantage of this plaster image is that it is relatively cheap; should a patron approve of the durable image and be willing to bear further expense, subsequent molds could be made for

1665-410: A plaster secondary support. Some, like Michelangelo's Sistine Chapel ceiling , are executed in fresco , meaning they are painted on a thin layer of wet plaster, called intonaco ; the pigments sink into this layer so that the plaster itself becomes the medium holding them, which accounts for the excellent durability of fresco. Additional work may be added a secco on top of the dry plaster, though this

1776-407: A positive model of the limb and used in fabricating the final medical device. In addition, dentures (false teeth) are made by first taking a dental impression using a soft, pliable material that can be removed from around the teeth and gums without loss of fidelity and using the impression to creating a wax model of the teeth and gums. The model is used to create a plaster mold (which is heated so

1887-400: A primary advantage of the material is that it is resistant to a fire within a room and so can assist in reducing or eliminating structural damage or destruction provided the fire is promptly extinguished. Lime plaster is used for frescoes , where pigments , diluted in water, are applied to the still wet plaster. USA and Iran are the main plaster producers in the world. Cement plaster is

1998-476: A professor of Surgery. In 1840, he became the professor of surgery at the academy of military medicine in St. Petersburg. Pirogov introduced the use of ether anaesthesia to Russia and made important contributions to the study of cross-sectional human anatomy. With the help of his patron, the grand duchess Helene Pavlovna , he introduced female nurses into the military hospitals at the same time that Florence Nightingale

2109-420: A remarkable property of setting into a hard mass on wetting with water. CaSO 4 ⋅ 1 2 H 2 O + 1 1 2 H 2 O ⟶ CaSO 4 ⋅ 2 H 2 O {\displaystyle {\ce {CaSO4.1/2H2O + 1 1/2H2O -> CaSO4.2H2O}}} Plaster of Paris

2220-431: A rigid denture base. Moreover, in dentistry there are 5 types of gypsum products depending on their consistency and uses: 1) impression plaster (type 1), 2) model plaster (type 2), dental stones (types 3, 4 and 5) In orthotics and prosthetics, plaster bandages traditionally were used to create impressions of the patient's limb (or residuum). This negative impression was then, itself, filled with plaster of Paris, to create

2331-459: A similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface. The reaction with water liberates heat through crystallization and the hydrated plaster then hardens. Plaster can be relatively easily worked with metal tools and sandpaper and can be moulded, either on site or in advance, and worked pieces can be put in place with adhesive . Plaster

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2442-523: A sledge. When small enough, a froe and mallet were used to split away narrow strips of lath. Farm animals provided hair and manure for the float coat of plaster. Fields of wheat and grains provided straw and hay to reinforce the clay plaster. But there was no uniformity in clay plaster recipes. Manure provides fiber for tensile strength as well as protein adhesive. Unlike casein used with lime plaster, hydrogen bonds of manure proteins are weakened by moisture. With braced timber-framed structures clay plaster

2553-407: A snug and therefore more comfortable fit. In addition, plaster is much smoother and does not snag clothing or abrade the skin. Upper extremity casts encase the arm, wrist, or hand. A long arm cast encases the arm from the hand to about 5 cm below the armpit, leaving fingers and thumbs free. A short arm cast, in contrast, stops just below the elbow. Both varieties may, depending on the injury and

2664-416: A stronger, harder and denser derivative of plaster which is manufactured from gypsum under pressure. Plaster is also used to invest and flask wax dentures, the wax being subsequently removed by "burning out," and replaced with flowable denture base material. The typically acrylic denture base then cures in the plaster investment mold. Plaster investments can withstand the high heat and pressure needed to ensure

2775-401: A waterproof, washable, lightweight, strong and comfortable way of recovering from fractures . Casts are typically removed by perforation using a cast saw, an oscillating saw designed to cut rigid material such as plaster or fiberglass while not harming soft tissue. Manually operated shears, patented in 1950 by Neil McKay , may be used on pediatric or other patients who may be affected by

2886-565: A wet sponge or brush as they were applied and rubbed by hand until they hardened. Plaster of Paris dressings were first employed in the treatment of mass casualties in the 1850s during the Crimean War by Nikolai Ivanovich Pirogov (1810–1881). Pirogov was born in Moscow and received his early education there. After obtaining a medical degree at Dorpat (now Tartu, Estonia ) he studied at Berlin and Göttingen before returning to Dorpat as

2997-633: Is calcined gypsum (roasted gypsum), ground to a fine powder by milling. When water is added, the more soluble form of calcium sulfate returns to the relatively insoluble form, and heat is produced. The setting of unmodified plaster starts about 10 minutes after mixing and is complete in about 45 minutes; however, the cast is not fully dry for 72 hours. Bandages of synthetic materials are also used—often knitted fiberglass bandages impregnated with polyurethane , sometimes bandages of thermoplastic . These are lighter and dry much faster than plaster bandages. However, plaster can be more easily moulded to make

3108-521: Is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of buildings, while "render" commonly refers to external applications. The term stucco refers to plasterwork that is worked in some way to produce relief decoration, rather than flat surfaces. The most common types of plaster mainly contain either gypsum , lime , or cement , but all work in

3219-409: Is a 3-dimensional problem that requires correction in all three planes. The EDF casting method can elongate the spine through traction, derotate the spine/pelvis, and improve lordosis and overall body shape and alignment. EDF differs from Risser casting. EDF casts are either over or under the shoulder, and have a large mushroom opening on the front to allow for proper chest expansion. On the back, there

3330-555: Is a double hip spica. A one-and-a-half hip spica encases one leg to the ankle or foot and the other to just above the knee. The extent to which the hip spica covers the trunk depends greatly on the injury and the surgeon; the spica may extend only to the navel, allowing mobility of the spine and the possibility of walking with the aid of crutches, or may extend to the rib cage or even to the armpits in some rare cases. Hip spicas are common in maintaining reduction of femoral fractures and are also used for congenital hip dislocations, mostly while

3441-590: Is a mixture of clay , sand and water often with the addition of plant fibers for tensile strength over wood lath . Clay plaster has been used around the world at least since antiquity. Settlers in the American colonies used clay plaster on the interiors of their houses: "Interior plastering in the form of clay antedated even the building of houses of frame, and must have been visible in the inside of wattle filling in those earliest frame houses in which … wainscot had not been indulged. Clay continued in use long after

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3552-447: Is a shell, frequently made from plaster or fiberglass , that encases a limb (or, in some cases, large portions of the body) to stabilize and hold anatomical structures—most often a broken bone (or bones), in place until healing is confirmed. It is similar in function to a splint . Plaster bandages consist of a cotton bandage that has been combined with plaster of paris , which hardens after it has been made wet. Plaster of Paris

3663-408: Is a small cutout on the concavity of the curve, not going past the midline. It was found that the spine became more aligned with this cutout than without, and that it helped correct rotation. A cast that includes the trunk of the body and one or more limbs is a spica cast, just as is a cast that includes the "trunk" of the arm and one or more fingers or the thumb. For example, a shoulder spica includes

3774-422: Is a true rarity in recorded medical history, and this type of large scale cast appears more commonly in various Hollywood movies and on television shows. The term body cast (or full body cast) is sometimes casually used by laymen to describe any of a number of body or spica casts, from a simple body jacket to a more extensive hip spica. Due to the nature of the dressing, the limb is unreachable during treatment, and

3885-462: Is accompanied by a slight expansion of volume. It is used in making casts for statues, toys , and more. The initial matrix consists mostly of orthorhombic crystals: the kinetic product. Over the next 72 hours, the rhombic crystals give way to an interlocking mass of monoclinic crystal needles, and the plaster increases in hardness and strength. If plaster or gypsum is heated to between 130 °C (266 °F) and 180 °C (350 °F), hemihydrate

3996-446: Is also available. There are some washable casts like FlexiOH which provide good ventilation and maintain good skin hygiene. With this cast, patients are able to bathe and go out in the rain. These types of casts have advantages that deliver patients a better treatment than conventional casts made of plaster of Paris or Fiberglass. They are the next generation of orthopedic immobilization photo-curing specialty-resin technology that enables

4107-525: Is commonly based on the reaction of gypsum plaster with water, where the water is selectively applied by the inkjet head. The chemical reaction that occurs when plaster is mixed with water is exothermic . When plaster sets, it can reach temperatures of more than 60 °C (140 °F) and, in large volumes, can burn the skin. In January 2007, a secondary school student in Lincolnshire , England sustained third-degree burns after encasing her hands in

4218-456: Is formed, which will also re-form as gypsum if mixed with water. On heating to 180 °C (350 °F), the nearly water-free form, called γ-anhydrite (CaSO 4 · n H 2 O where n = 0 to 0.05) is produced. γ-anhydrite reacts slowly with water to return to the dihydrate state, a property exploited in some commercial desiccants . On heating above 250 °C (480 °F), the completely anhydrous form called β-anhydrite or dead burned plaster

4329-436: Is formed. Lime plaster is a mixture of calcium hydroxide and sand (or other inert fillers). Carbon dioxide in the atmosphere causes the plaster to set by transforming the calcium hydroxide into calcium carbonate ( limestone ). Whitewash is based on the same chemistry. To make lime plaster, limestone (calcium carbonate) is heated above approximately 850 °C (1600 °F) to produce quicklime (calcium oxide). Water

4440-735: Is generally less durable. Plaster (often called stucco in this context) is a far easier material for making reliefs than stone or wood, and was widely used for large interior wall-reliefs in Egypt and the Near East from antiquity into Islamic times (latterly for architectural decoration, as at the Alhambra ), Rome, and Europe from at least the Renaissance, as well as probably elsewhere. However, it needs very good conditions to survive long in unmaintained buildings – Roman decorative plasterwork

4551-490: Is mainly known from Pompeii and other sites buried by ash from Mount Vesuvius . Plaster may be cast directly into a damp clay mold. In creating this piece molds (molds designed for making multiple copies) or waste molds (for single use) would be made of plaster. This "negative" image, if properly designed, may be used to produce clay productions, which when fired in a kiln become terra cotta building decorations, or these may be used to create cast concrete sculptures. If

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4662-477: Is not uniform like sawn lath. The straightness or waviness of the grain affected the thickness or width of each lath, and thus the spacing of the lath. The clay plaster rough coat varied to cover the irregular lath. Window and door trim as well as the mudboard (baseboard) acted as screeds. With the variation of the lath thickness and use of coarse straw and manure, the clay coat of plaster was thick in comparison to later lime-only and gypsum plasters. In Economy Village,

4773-594: Is often used as an artistic material for casting. Plaster is also commonly spread over an armature (form), made of wire mesh, cloth, or other materials; a process for adding raised details. For these processes, limestone or acrylic based plaster may be employed, known as stucco. Products composed mainly of plaster of Paris and a small amount of Portland cement are used for casting sculptures and other art objects as well as molds. Considerably harder and stronger than straight plaster of Paris, these products are for indoor use only as they degrade in moist conditions. Plaster

4884-533: Is produced by heating gypsum to about 120–180 °C (248–356 °F) in a kiln: CaSO 4 ⋅ 2 H 2 O ⟶ heat CaSO 4 ⋅ 1 2 H 2 O + 1 1 2 H 2 O ↑ {\displaystyle {\ce {CaSO4.2H2O {\overset {heat}{{}->{}}}{CaSO4.1/2H2O}+ 1\!1/2 H2O ^}}} (released as steam). Plaster of Paris has

4995-430: Is still popular). Pirogov went on to develop his own methods, although he was aware of Mathijsen's work. Pirogov's method involved soaking coarse cloth in a plaster of Paris mixture immediately before application to the limbs, which were protected either by stockings or cotton pads. Large dressings were reinforced with pieces of wood. As time passed and the method moved more into the mainstream some disagreement arose as to

5106-419: Is stored in moisture -proof containers, because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration, which will make it useless after some time. When the dry plaster powder is mixed with water, it rehydrates over time into gypsum. The setting of plaster slurry starts about 10 minutes after mixing and is complete in about 45 minutes. The setting of plaster of Paris

5217-455: Is suitable for finishing rather than load-bearing, and when thickly applied for decoration may require a hidden supporting framework. Forms of plaster have several other uses. In medicine, plaster orthopedic casts are still often used for supporting set broken bones. In dentistry, plaster is used to make dental models by pouring the material into dental impressions . Various types of models and moulds are made with plaster. In art, lime plaster

5328-402: Is the traditional matrix for fresco painting; the pigments are applied to a thin wet top layer of plaster and fuse with it so that the painting is actually in coloured plaster. In the ancient world, as well as the sort of ornamental designs in plaster relief that are still used, plaster was also widely used to create large figurative reliefs for walls, though few of these have survived. Plaster

5439-421: Is then added to produce slaked lime (calcium hydroxide), which is sold as a wet putty or a white powder. Additional water is added to form a paste prior to use. The paste may be stored in airtight containers. When exposed to the atmosphere, the calcium hydroxide very slowly turns back into calcium carbonate through reaction with atmospheric carbon dioxide, causing the plaster to increase in strength. Lime plaster

5550-476: Is to find lime, bricks, clay, stone, haire, together with laborers and workmen." Records of the New Haven colony in 1641 mention clay and hay as well as lime and hair also. In German houses of Pennsylvania the use of clay persisted. Old Economy Village is one such German settlement. The early Nineteenth-Century utopian village in present-day Ambridge , Pennsylvania, used clay plaster substrate exclusively in

5661-400: Is to replace conventional gypsum plasters in cases where the temperature can get too high for gypsum plaster to stay on the wall or ceiling. An example of a heat-resistant plaster composition is a mixture of Portland cement , gypsum, lime, exfoliated insulating aggregate ( perlite and vermiculite or mica ), phosphate shale , and small amounts of adhesive binder (such as Gum karaya ), and

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5772-503: Is used. The walls are painted with the plaster which (in some countries) is nothing but calcium carbonate. After drying the calcium carbonate plaster turns white and then the wall is ready to be painted. Elsewhere in the world, such as the UK, ever finer layers of plaster are added on top of the plasterboard (or sometimes the brick wall directly) to give a smooth brown polished texture ready for painting. Mural paintings are commonly painted onto

5883-401: Is widely used as a support for broken bones; a bandage impregnated with plaster is moistened and then wrapped around the damaged limb, setting into a close-fitting yet easily removed tube, known as an orthopedic cast . Plaster is also used in preparation for radiotherapy when fabricating individualized immobilization shells for patients. Plaster bandages are used to construct an impression of

5994-471: The hair follicles and sweat glands can lead to severe and painful dermatitis . Other limitations of plaster casts include their weight, which can be quite considerable, thus restricting movement, especially of a child. Removal of the cast requires destroying the cast itself. The process is often noisy, making use of a special oscillating saw that can easily cut the hard cast material but has difficulty cutting soft material like cast padding or skin. Although

6105-425: The metatarsals in both weight bearing and non-weight bearing leg casts. These are referred to as toeplates in the orthopedic discipline of medicine. This addition may be applied to further support and stabilize the metatarsals by limiting motion through a higher degree of immobilization, as well as protecting the toes from additional blunt force trauma. Typically leg casts with toeplates are prescribed for injuries to

6216-674: The East Quarter. Some of the interiors were plastered by a French specialist craftsman called Hector Beato. The three craftsmen were known as "pargeonars" and their interior work was sometimes called "pargeoning". Lime for the work came from kilns on the nearby Lomond Hills or was shipped from Dundee to Lindores . Some lime called "unburnt plaster" shipped from Dundee was processed for use at Falkland using coal. The lime used with sand to "pergyn" two round turrets and vaulted entranceways or "transes" at Holyrood Palace in 1532 came from Cousland and Gilmerton . Plaster Plaster

6327-564: The Middle East. As a result, Larrey accumulated a vast experience of military medicine and surgery. One of his patients after the Battle of Borodino in 1812 was an infantry officer whose arm was amputated at the shoulder. The patient was evacuated immediately following the operation and passed from Russia, through Poland and Germany. When the dressing was removed on his arrival home in France,

6438-428: The above common forms, body casts could come in nearly any size and configuration. For example, from the 1910s to the 1970s, use of a turnbuckle cast, which used metal turnbuckles to twist two halves of the cast so as to forcibly straighten the spine before surgery was common. The turnbuckle cast had no single configuration, and could be as small as a body jacket split in half, or could include the head, one or both legs to

6549-443: The adoption of laths and brick filling for the frame." Where lime was not easily accessible it was rationed and usually substituted with clay as a binder. In Martin E. Weaver 's seminal work he says, "Mud plaster consists of clay or earth which is mixed with water to give a 'plastic' or workable consistency. If the clay mixture is too plastic it will shrink, crack and distort on drying. Sand, fine gravels and fibres were added to reduce

6660-548: The application time of the cast and increases the cost of the cast. Drying time, however, can be inconvenient enough to warrant a cast and bandage moisture protector. These waterproof covers allow for bathing and showering while wearing either a plaster or fiberglass cast. The waterproof cast cover stays tightly around the cast and prevents water from ever reaching it while the patient is in contact with water. The cover can easily be removed to dry, and can be re-used often. Cast liners are often cotton, though waterproof lining material

6771-412: The bones in a long narrow box, which they filled with moist sand. Substitution of plaster of Paris for the sand was the next logical step. Such plaster casts did not succeed however as the patient was confined to bed due to the casts being heavy and cumbersome. Plaster of Paris bandages were introduced in different forms by two army surgeons, one at a peacetime home station and another on active service at

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6882-458: The brick and wood frame high architecture of the Feast Hall, Great House and other large and commercial structures as well as in the brick, frame and log dwellings of the society members. The use of clay in plaster and in laying brickwork appears to have been a common practice at that time not just in the construction of Economy village when the settlement was founded in 1824. Specifications for

6993-405: The cast clean and dry. Because the hips cannot bend, using a toilet is difficult, if not impossible. It is therefore necessary for the patient to either use a diaper, bedpan, or catheters to manage bodily waste eliminations. Bathing must be done by sponge baths. Hair may be shampooed by using plastic wash basins under the head. To shampoo wash the hair of a child, the child can be lifted and placed on

7104-467: The casted patient to not lift them by this spreader bar, as it may break and this could cause injury to the patient. To facilitate toileting or diaper changing and hygienic cleaning, an opening is created in the cast at the groin. The opening is normally referred to as the "perineal opening". It is formed either during cast application or after cast application by cutting the hole with the cast saw. The opening must then be petalled or lined to keep this area of

7215-417: The child is still an infant. In some cases, a hip spica may only extend down one or more legs to above the knee. Such casts, called pantaloon casts, are occasionally seen to immobilize an injured lumbar spine or pelvis, in which case the trunk portion of the cast usually extends to the armpits. Mobility is severely restricted by the hip spica cast and walking without crutches or a walker is impossible because

7326-475: The concentrations of fine clay particles which were the cause of the excessive shrinkage." Manure was often added for its fibre content. In some building techniques straw or grass was used as reinforcement. In the Earliest European settlers' plasterwork, a mud plaster was used McKee wrote, of a circa 1675 Massachusetts contract that specified the plasterer, "Is to lath and siele the four rooms of

7437-465: The construction of, "Lock keepers houses on the Chesapeake and Ohio Canal, written about 1828, require stone walls to be laid with clay mortar, excepting 3 inches on the outside of the walls … which (are) to be good lime mortar and well pointed." The choice of clay was because of its low cost, but also the availability. At Economy, root cellars dug under the houses yielded clay and sand (stone), or

7548-445: The creation of a wax image to be used in lost wax casting , a far more expensive process. In lieu of producing a bronze image suitable for outdoor use the plaster image may be painted to resemble a metal image; such sculptures are suitable only for presentation in a weather-protected environment. Plaster expands while hardening then contracts slightly just before hardening completely. This makes plaster excellent for use in molds, and it

7659-470: The doctor's decision, include one or more fingers or the thumb, in which case it is called a finger spica or thumb spica cast. Lower extremity casts are classified similarly, with a cast encasing both the foot and the leg to the hip being called a long leg cast, while a cast encasing the patient's foot, ankle and lower leg ending below the knee being called a short leg cast. A walking heel may be applied for ambulation. These heels, when properly applied, elevate

7770-459: The early mobilization of patients with fractures and a marked reduction in hospital time required. Although these bandages were an improvement over Larrey's method, they were far from ideal. They required a long time to apply and dry and there was often shrinkage and distortion. A great deal of interest had been aroused in Europe around 1800 by a British diplomat, consul William Eton , who described

7881-460: The field of Waterloo . At the time of the development of his bandage he was chief surgeon in the Belgium army. Seutin's "bandage amidonnee" consisted of cardboard splints and bandages soaked in a solution of starch and applied wet. These dressings required 2 to 3 days to dry, depending on the temperature and humidity of the surroundings. The substitution of Dextrin for starch, advocated by Velpeau,

7992-639: The finished product and increase thermal insulation. One differentiates between interior and exterior fireproofing. Interior products are typically less substantial, with lower densities and lower cost. Exterior products have to withstand harsher environmental conditions. A rough surface is typically forgiven inside of buildings as dropped ceilings often hide them. Fireproofing plasters are losing ground to more costly intumescent and endothermic products, simply on technical merit. Trade jurisdiction on unionized construction sites in North America remains with

8103-422: The floor. Some children even learn to walk by holding themselves up against furniture. A child in a spica cast must always be supervised and safety must always be considered when they are at a mobile phase of their healing to prevent reinjury or damage to the cast. Many spica casts have a spreader bar between the legs to help strengthen the cast and support the legs in the proper positions. It is important when moving

8214-408: The foot and metatarsals. Ordinarily, a leg cast applied for the treatment of a stable ankle fracture would not use the toeplate design because there is no need to immobilize and limit the motion of the patient's toes. In some cases, a cast may include the upper and lower arm and the elbow, but leave the wrist and hand free, or the upper and lower leg and the knee, leaving the foot and ankle free. Such

8325-669: The front. Antonius Mathijsen (1805–1878) was born in Budel , the Netherlands, where his father was the village doctor. He was educated in Brussels, Maastricht and Utrecht obtaining the degree of doctor of medicine at Gissen in 1837. He spent his entire career as a medical officer in the Dutch Army. While he was stationed at Haarlem in 1851, he developed a method of applying plaster of Paris bandages. A brief note describing his method

8436-441: The guise of building rehabilitation." Gypsum plaster, also known as plaster of Paris , is a white powder consisting of calcium sulfate hemihydrate . The natural form of the compound is the mineral bassanite . The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre , a hill in the north end of Paris . Gypsum plaster, gypsum powder, or plaster of Paris,

8547-424: The harl is sometimes lime washed in a colour using traditional techniques. It is not recommendable to replace more than around 20% of the lime content with cement . Cement-based render is very stiff and prone to crack or detach from the wall when subjected to stress induced by expansion due to solar radiation and moisture. It is also less permeable to moisture and water vapour. Water entering through fine cracks in

8658-411: The hips cannot bend. There is a serious danger of falling if the patient in a hip spica cast tries to get upright to walk without assistance because they lack the ability to control their balance. Patients normally remain in a bed or rely on a reclining wheelchair or children's stroller. Children in spica casts can sometimes learn to get mobile by scooting around on skateboards, or pulling themselves across

8769-450: The house betwixt the joists overhead with a coat of lime and haire upon the clay; also to fill the gable ends of the house with ricks and plaister them with clay. 5. To lath and plaster partitions of the house with clay and lime, and to fill, lath, and plaister them with lime and haire besides; and to siele and lath them overhead with lime; also to fill, lath, and plaster the kitchen up to the wall plate on every side. 6. The said Daniel Andrews

8880-400: The knees or feet, or one arm to the elbow or wrist. Despite the large size and extreme immobilization some casts, particularly those used in or before the 1970s, the popular term full body cast is something of a misnomer. The popular and media-driven conception of a massive cast encasing all four limbs, the trunk, and the head – sometimes leaving only small slits for the eyes, nose, and mouth –

8991-489: The lime top coats are thin veneers often an eighth inch or less attesting to the scarcity of limestone supplies there. Clay plasters with their lack of tensile and compressive strength fell out of favor as industrial mining and technology advances in kiln production led to the exclusive use of lime and then gypsum in plaster applications. However, clay plasters still exist after hundreds of years clinging to split lath on rusty square nails. The wall variations and roughness reveal

9102-496: The man widely regarded as the leading French surgeon at the beginning of the 19th century, reduced the drying time to 6 hours. Although this was a vast improvement, it was still a long time, especially in the harsh environment of the battlefield. A good description of Seutin's technique was provided by Sampson Gamgee who learned it from Seutin in France during the winter of 1851–52 and went on to promote its use in Britain. The limb

9213-480: The mix. Because plaster of Paris sets quickly, "retardants" were used to slow setting time enough to allow workers to mix large working quantities of lime putty plaster. A modern form of this method uses expanded metal mesh over wood or metal structures, which allows a great freedom of design as it is adaptable to both simple and compound curves. Today this building method has been partly replaced with drywall , also composed mostly of gypsum plaster. In both these methods,

9324-403: The nearby Ohio river yielded washed sand from the sand bars; and lime outcroppings and oyster shell for the lime kiln . The surrounding forests of the new village of Economy provided straight grain, old- growth oak trees for lath. Hand split lath starts with a log of straight grained wood of the required length. The log is split into quarters and then smaller and smaller bolts with wedges and

9435-420: The noise of the saw. The earliest methods of holding a reduced fracture involved using splints . These are rigid strips laid parallel to each other alongside the bone. The Ancient Egyptians used wooden splints made of bark wrapped in linen. They also used stiff bandages for support that were probably derived from embalming techniques. The use of plaster of Paris to cover walls is evident, but it seems it

9546-412: The patient's casted foot while helping to maintain better hygiene by preventing the cast from directly contacting potentially dirty or wet ground surfaces. Where the patient is not to walk on the injured limb, crutches or a wheelchair may be provided. The foot's under-sole portion of a leg cast may be extended terminating at the tip of the patient's toes, to create a rigid support that limits motion of

9657-429: The patient's face, ears, and sometimes the top of the head and hair. The Risser cast was similar, extending from the patient's hips to the neck and sometimes including part of the head. Both of these casts could, with care and the doctor's permission, be walked in during convalescence. However, in some cases the Risser cast would extend into one or more pantaloons, in which case mobility was far more restricted. Aside from

9768-403: The plasterers, regardless of whether the plaster is decorative in nature or is used in passive fire protection. Cementitious and gypsum based plasters tend to be endothermic. Fireproofing plasters are closely related to firestop mortars. Most firestop mortars can be sprayed and tooled very well, due to the fine detail work that is required of firestopping. Powder bed and inkjet head 3D printing

9879-453: The powder form is converted in a sheet form and the sheet is then attached to the basic ceiling with the help of fasteners. It is done in various designs containing various combinations of lights and colors. The common use of this plaster can be seen in the construction of houses. Post-construction, direct painting is possible (which is commonly seen in French architecture), but elsewhere plaster

9990-505: The problems associated with cutting off air to skin contact, and also some improvements were made. Eventually Pirogov's method gave way to Mathijsen's. Among the improvements suggested as early as 1860 was that of making the dressing resistant to water by painting the dried plaster of Paris with a mixture of shellac dissolved in alcohol. The first commercial bandages were not produced until 1931 in Germany, and were called Cellona. Before that

10101-401: The removal is often painless, this can be distressing for the patient, especially children. A cast saw can cut, abrade, or burn skin, but those results are uncommon. Additionally, plaster of Paris casts break down if patients get them wet. Due to the limitations of plaster of Paris, surgeons have also experimented with other types of materials for use as splints. An early plastic like material

10212-423: The skin under the plaster becomes dry and scaly because the discarded outer skin cells are not washed or brushed off. Also, plaster of Paris casts can result in cutaneous complications including macerations, ulcerations, infections, rashes, itching, burns, and allergic contact dermatitis, which may also be due to the presence of formaldehyde within the plaster bandages. In hot weather, staphylococcal infection of

10323-581: The standard method for the healing of fractures was bed rest and restriction of activity. The search for a simpler, less-time-consuming, method led to the development of the first modern occlusive dressings, stiffened at first with starch and later with plaster-of-paris. The ambulatory treatment of fractures was the direct result of these innovations. The innovation of the modern cast can be traced to, among others, four military surgeons, Dominique Jean Larrey , Louis Seutin , Antonius Mathijsen , and Nikolai Ivanovich Pirogov . Dominique Jean Larrey (1768–1842)

10434-544: The surface does not easily diffuse and can penetrate into the softer stone, thus causing the deterioration which harling aims to prevent. For similar reasons, modern barrier paints should not be used in place of traditional lime washes. An example of the inadequate protection afforded by high cement harling is the Charles Rennie Mackintosh designed Hill House completed in 1904 using the newly available but poorly understood Portland cement harling. Over

10545-425: The toes and offer the wearer the advantage of keeping the toes out of the dirt and moisture of the street. The walking heel provides a small contact patch for the cast and creates a fluid rocking motion during the stride as the cast can pivot easily in any direction. Similarly, a weight-bearing cast shoe (cast boot, cast sandal) can help the patient walk during convalescence. Additionally, a castshoe can simply protect

10656-437: The trunk of the body and one arm, usually to the wrist or hand. Shoulder spicas are almost never seen today, having been replaced with specialized splints and slings that provide early mobility of the injury to avoid joint stiffness after healing. A hip spica includes the trunk of the body and one or more legs. A hip spica that covers only one leg to the ankle or foot is called a single hip spica, while one that covers both legs

10767-462: The twelfth century recommended bandages hardened with a flour and egg mixture as did medieval European bonesetters, who used casts made of egg white, flour, and animal fat. By the sixteenth century the famous French surgeon Ambroise Paré (1517–1590), who championed more humane treatments in medicine and promoted the use of artificial limbs, made casts of wax, cardboard, cloth, and parchment that hardened as they dried. These methods all had merit, but

10878-582: The wax melts and flows out) and the denture materials are injected into the mold. After a curing period, the mold is opened and the dentures are cleaned up and polished. Plasters have been in use in passive fire protection , as fireproofing products, for many decades. Gypsum plaster releases water vapor when exposed to flame, acting to slow the spread of the fire, for as much as an hour or two depending on thickness. Plaster also provides some insulation to retard heat flow into structural steel elements, that would otherwise lose their strength and collapse in

10989-403: The wound had healed. Larrey concluded that the fact that the wound had been undisturbed had facilitated healing. After the war, Larrey began stiffening bandages using camphorated alcohol, lead acetate and egg whites beaten in water. An improved method was introduced by Louis Seutin , (1793–1865) of Brussels. In 1815 Seutin had served in the allied armies in the war against Napoleon and was on

11100-430: The years water had penetrated the harling and threatened the overall integrity of the building. The National Trust for Scotland , the building's owner, has (2019) enclosed Hill House in a transparent 'box' which will allow some rain to enter but which will eventually allow it to dry naturally. It is estimated that this will take seven to ten years, after which the box will be removed. The technique of harling features in

11211-454: Was gutta-percha obtained from the latex of trees found in Malaya . It resembled rubber, but contained more resins. When dry it was hard and inelastic, but when warmed it became soft and malleable. In 1851 Utterhoeven described the use of splints made from this material for the treatment of fractures. In the 1970s, the development of fibreglass casting tape made it possible to produce a cast that

11322-431: Was a common building material for wall surfaces in a process known as lath and plaster , whereby a series of wooden strips on a studwork frame was covered with a semi-dry plaster that hardened into a surface. The plaster used in most lath and plaster construction was mainly lime plaster , with a cure time of about a month. To stabilize the lime plaster during curing, small amounts of plaster of Paris were incorporated into

11433-525: Was beginning a similar program in British military hospitals. Seutin had travelled through Russia demonstrating his 'starched bandage', and his technique had been adopted by both the Russian army and navy by 1837. Pirogov had observed the use of plaster of Paris bandages in the studio of a sculptor who used strips of linen soaked in liquid plaster of Paris for making models (this technique, called " modroc ,"

11544-670: Was born in a small town in southern France. He first studied medicine with his uncle, a surgeon in Toulouse. After a short tour of duty as a naval surgeon, he returned to Paris, where he became caught up in the turmoil of the French Revolution , being present at the Storming of the Bastille . From then on, he made his career as a surgeon in France's revolutionary and Napoleonic armies , which he accompanied throughout Europe and

11655-464: Was first introduced in America around 1909 and was often called by the generic name adamant plaster after a prominent manufacturer of the time. The advantages of cement plaster noted at that time were its strength, hardness, quick setting time and durability. Heat-resistant plaster is a building material used for coating walls and chimney breasts and for use as a fire barrier in ceilings. Its purpose

11766-534: Was first used as a building material and for decoration in the Middle East at least 7,000 years ago. In Egypt, gypsum was burned in open fires, crushed into powder, and mixed with water to create plaster, used as a mortar between the blocks of pyramids and to provide a smooth wall facing. In Jericho, a cult arose where human skulls were decorated with plaster and painted to appear lifelike. The Romans brought plaster-work techniques to Europe . Clay plaster

11877-439: Was initially wrapped in wool, especially over any bony prominences. Pasteboard was then cut into shape to provide a splint, and dampened so it could be molded to the limb. The limb was then wrapped in bandages before a starch coating was applied to the outer surface. Seutin's technique for the application of the starch apparatus formed the basis of the technique used with plaster of Paris dressings today. The use of this method led to

11988-443: Was lighter and more durable than the traditional plaster cast and also resistant to water (though the bandages underneath were not) helping the patient be more active. In the 1990s the introduction of new cast lining has meant that fiberglass casts with this liner are completely waterproof, allowing patients to bathe, shower, and swim while wearing a cast. The waterproof cast liner however adds approximately two to three more minutes to

12099-696: Was never used for bandages. Ancient Hindus treated fractures with bamboo splints, and the writings of Hippocrates discuss management of fractures in some detail, recommending wooden splints plus exercise to prevent muscle atrophy during the immobilization. The ancient Greeks also used waxes and resins to create stiffened bandages and the Roman Celsus , writing in AD 30, describes how to use splints and bandages stiffened with starch. Arabian doctors used lime derived from sea shells and albumen from egg whites to stiffen bandages. The Italian School of Salerno in

12210-506: Was published on January 30, 1852; it was followed shortly by more complete accounts. In these accounts Mathijsen emphasised that only simple materials were required and the bandage could be quickly applied without assistance. The bandages hardened rapidly, provided an exact fit and could be windowed or bivalved (cut to provide strain relief) easily. Mathijsen used coarsely woven materials, usually linen, into which dry plaster of Paris had been rubbed thoroughly. The bandages were then moistened with

12321-424: Was used on interior walls and ceilings as well as exterior walls as the wall cavity and exterior cladding isolated the clay plaster from moisture penetration. Application of clay plaster in brick structures risked water penetration from failed mortar joints on the exterior brick walls. In Economy Village, the rear and middle wythes of brick dwelling walls are laid in a clay and sand mortar with the front wythe bedded in

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