Plaster of Paris
نویسنده
چکیده
Paris (CaS04)2H20. Excessive heat convey it into anhydrous calcium sulphate CaB^< which takes up water very slowly and does D?. harden and set. 2CaS04.2H20 = (CaSW 2H20+3H20. (CaS04)2H20 = 2CaS 04H2U, Commercial plaster of Paris is manufacture from impure gypsum and therefore contains tn impurities present in the gypsum such as alum10^ iron, silicates, carbonates, lime, etc., which be recognized by appropriate chemical test-' These, together with traces of undehydrat^ gypsum, or anhydrous calcium sulphate, do interfere with the proper setting unless they ^
منابع مشابه
Plaster of Paris–Short History of Casting and Injured Limb Immobilzation
Various materials have been used since ancient times to help immobilise fractures. In this review, we discuss the history and developments of these materials as well as plaster of Paris. There has been a recent trend away from non-operative management of fractures, and skills in the use of plaster of Paris are declining. For the successful treatment of patients, it is important to appreciate ho...
متن کاملHexcelite versus plaster of Paris: a controlled trial of the below-knee walking cast.
Hexcelite and plaster of Paris below-knee walking casts were compared in a controlled clinical trial, involving 82 patients. Fewer bandage complications, problems and better comfort was found with Hexcelite compared to plaster of Paris (P less than 0.05). If all costs relating to materials, transportation, complications and extra visits due to these, were taken into account, plaster of Paris wa...
متن کاملlearning zone - Orthopaedic plaster casting: nurse and patient education
Orthopaedic casts are used to treat fractures, provide pain relief and support, and correct deformities (RCN 2000, Larsen 2002, Dandy and Edwards 2003, Nielsen and Ricketts 2005). Several different types of material are available for orthopaedic casts, including plaster of Paris, semi-rigid non-fibreglass (softcast), and a variety of resin-based synthetic materials such as rigid fibreglass. Pla...
متن کاملUse of particulate dentin-plaster of Paris combination with/without platelet-rich plasma in the treatment of bone defects around implants.
PURPOSE To evaluate the effect of particulate dentin-plaster of Paris with and without platelet-rich plasma (PRP) on bone healing and new bone formation around titanium dental implants in a canine model. Histologic sections and histomorphometric analysis of the defects were obtained at 6 and 12 weeks after surgery. MATERIALS AND METHODS Three circular bone defects were surgically prepared in ...
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