What's the difference between gypsum and plaster?

Gypsum


Definition:

  • (n.) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.

Example Sentences:

  • (1) Ten alginates and seven gypsum products were tested.
  • (2) It is recommended that manufacturers pay more strict adherence to the requirements of the ISO Standard with regard to the availability and recommendation of suitable compatible gypsum products, and also that perhaps the actual Standard should be modified to be more realistic in its demands, and more discriminatory in its evaluation procedure.
  • (3) The diffusive properties of alginate membranes prepared by the interfacial reaction of sodium alginate solution with gypsum substrates were studied.
  • (4) The tensile strength of a dental gypsum was measured indirectly using both the diametral and the double-punch tests.
  • (5) Radiation shielding tables were developed from the calculated transmissions through Pb, concrete, gypsum, steel, plate glass, and water, using a technique which eliminates the "add one HVL" rule.
  • (6) The use of alginate and a recently introduced modified gypsum product as investing media, as well as centrifugation of the pour resin into the flask, offer no significant advantages over the originally introduced procedure.
  • (7) And unlike beach sand, the sands here, made up of eroded gypsum crystals, do not get scorching hot in the sun and can usually be walked on in bare feet, even on the hottest days.
  • (8) The best way of sterilization is to make a gypsum model from the hydrocolloid impression and place it in the furnace for 30 min in 60 degrees C.
  • (9) The results show that the dosage of gypsum should be 10-20 grams, preferably ground to at least 60 mesh powder, the fine powder over 60 mesh is not to be pre-decocted, but the coarse powder of 40 mesh needs pre-decocting.
  • (10) The content of calcium ion Ca2+ in gypsum decoction has been determined with coordination titration.
  • (11) Gypsum produced only 5% and granular dusts none at all.
  • (12) The fibrous dusts (other than gypsum) resulted in a high incidence of mesothelioma (30 - 67%).
  • (13) In a small area (approximately 40 km2) against the mountains there is a concentration of over 20 large plants: oil refinery; iron and steel mill; fertilizer, cement, and gypsum production; coke kilns; and chemical, paint, and many other ancillary plants.
  • (14) Although the tissue conditioners generally exhibited higher deformations and lower gypsum compatibility than specified by ADA Specification No.
  • (15) Dehydration conditions similar to those employed in wet calcination of gypsum appeared to be produced under atmospheric pressure when NaCl was present.
  • (16) (4) Different gypsum products responded differently to bonding agents.
  • (17) of gypsum board, lead, and plate glass at this radiation level was 1.8, 0.020, and 1.3 cm, respectively.
  • (18) Part I of this study considered the ability of alginate and gypsum combinations to reproduce a line on a test block.
  • (19) The advantages of the halo-fixateur therapy compared against extension and immobilization in Minerva gypsum are that secondary correction of positioning is possible; that functionally disturbing and extended spondylodeses are avoided; that care of the polytraumatized patient is facilitated; that X-ray films are easy to assess; and that the period of hospitalization is greatly reduced.
  • (20) We used a profilometer to determine the roughness average, maximum roughness, and waviness of the dies, control, gypsum, and silicone test surfaces.

Plaster


Definition:

  • (n.) An external application of a consistency harder than ointment, prepared for use by spreading it on linen, leather, silk, or other material. It is adhesive at the ordinary temperature of the body, and is used, according to its composition, to produce a medicinal effect, to bind parts together, etc.; as, a porous plaster; sticking plaster.
  • (n.) A composition of lime, water, and sand, with or without hair as a bond, for coating walls, ceilings, and partitions of houses. See Mortar.
  • (n.) Calcined gypsum, or plaster of Paris, especially when ground, as used for making ornaments, figures, moldings, etc.; or calcined gypsum used as a fertilizer.
  • (v. t.) To cover with a plaster, as a wound or sore.
  • (v. t.) To overlay or cover with plaster, as the ceilings and walls of a house.
  • (v. t.) Fig.: To smooth over; to cover or conceal the defects of; to hide, as with a covering of plaster.

Example Sentences:

  • (1) Formation of the functional contour plaster bandage within the limits of the foot along the border of the fissure of the ankle joint with preservation of the contours of the ankles 4-8 weeks after the treatment was started in accordance with the severity of the fractures of the ankles in 95 patients both without (6) and with (89) dislocation of the bone fragments allowed to achieve the bone consolidation of the ankle fragments with recovery of the supportive ability of the extremity in 85 (89.5%) of the patients, after 6-8 weeks (7.2%) in the patients without displacement and after 10-13 weeks (11.3%) with displacement of the bone fragments of the ankles.
  • (2) Plaster of Paris, a biocompatible, degradable ceramic material prepared from CaSO4, may have an osteogenic property and become an alternative implant material for ear surgery.
  • (3) Conservative treatment (immobilisation in a plaster alone) was compared to percutaneous K-wire fixation.
  • (4) One must pay attention to the setting expansion of plasters and to the setting contraction of acrylic resins which may be very important if these materials are used without care.
  • (5) Images of dead ducks in oil sands tailings pond have been plastered on billboards in Denver, Portland, Seattle and Minneapolis.
  • (6) If the ambition set out by the world’s heads of state in New York is ever to be achieved, the global tax system needs more than just a sticking plaster.
  • (7) The soleus muscles were examined immediately after removal of the plaster or after six months of observation.
  • (8) Prevention of progressive orthopedic deformity through the use of plaster casts may minimize the need for surgical treatment.
  • (9) Holograms of dental casts may solve storage problems by replacing space consuming plaster models.
  • (10) In an outspoken intervention that will reignite tensions between church leaders and the government, Sentamu accuses those in power of offering only "warm words" and "sticking plaster" solutions to a problem that is having "devastating" effects on people's lives.
  • (11) Macroscopic and microscopic examination of plaster models obtained from impressions with alginate mass Kromopan Super and silicone mass Dentaflex Pasta confirmed that leaving of saliva and blood on the surface of impressions causes uneven surface of plaster models.
  • (12) This report summarizes the experience of treating seven extremity melanoma patients with early immobilization and discharge using plaster casting or splinting following wide local excision and split-thickness skin graft.
  • (13) But anyone who dreams that Germany’s warmth provides more than a sticking plaster to Europe’s migration crisis should have seen the scene half a mile south of the petrol station on Sunday.
  • (14) The risk of getting malaria was greater for inhabitants of the poorest type of house construction (incomplete, mud, or cadjan (palm) walls, and cadjan thatched roofs) compared to houses with complete brick and plaster walls and tiled roofs.
  • (15) The average duration of the plaster cast fixing period after resection treatment was 18 days longer than after curettage, but the low rate of recurrence in the first-mentioned case makes up for this disadvantage.
  • (16) It has been the policy of the accident and emergency department in Leicester to treat all clinically suspected fractures of the carpal scaphoid in plaster for 2 weeks, even after negative radiology.
  • (17) Andrew Tyrie, the Tory MP who chairs the Treasury select committee, has described the Co-op as an organisation "run by a plastering contractor, a farmer, a telecoms engineer, a computer technician, a nurse, a Methodist minister (Paul Flowers) – and two horticulturalists".
  • (18) Priority has been given to applying sticking-plasters to libel law when urgent surgery is needed to regulate a tabloid newspaper industry that has been shown to have no regard for privacy or the criminal law.
  • (19) Traditional elastomeric impression materials, four recently developed "hydrophilic" silicones and a hydrocolloid have been tested for their accuracy of reproduction by use of indirect measurements via plaster dies and for their wettability by means of the sessile drop method.
  • (20) Report on 35 cases of mallet finger treated conservatively: a circular plaster cast was modeled in hyperextension of the distal interphalangeal joint.