{"product_id":"dental-impression-plaster","title":"Dental Impression Plaster","description":"\u003cp\u003eAVAILABLE IN 5, 25, AND 50LB OPTIONS IN THE DROPDOWN\u003c\/p\u003e\r\n\u003cp\u003eUSG Dental Plaster - Impression is designed for use in oral impression work where very fast set times\u003cbr\u003eare needed. Fast-setting USG Dental Plaster – Impression is easy to use and offers many applications\u003cbr\u003efor dental stones. Its set time can be altered by the use of accelerators or retarders. Water soluble,\u003cbr\u003eUSG Dental Plaster – Impression requires no organic solvents for cleanup.\u003c\/p\u003e\r\n\u003cp\u003eMIXING INSTRUCTIONS\u003c\/p\u003e\r\n\u003cp\u003eUse potable water at temperatures between 70 °F (21 °C) and 100 °F (38 °C). Because variations\u003cbr\u003ein slurry (USG Dental Plaster - Impression and water mixture) temperature produce variations in\u003cbr\u003eset time, it is important to keep both the USG Dental Plaster - Impression and water in a stable\u003cbr\u003etemperature environment prior to use. The higher the temperature of the slurry, the shorter the set\u003cbr\u003etime. Conversely, the lower the temperature of the slurry, the longer the set time.\u003c\/p\u003e\r\n\u003cp\u003eWeigh both the USG Dental Plaster - Impression and the water prior to use for each mix. The water-\u003cbr\u003eto-USG Dental Plaster - Impression ratio is critical because it governs the strength and the density\u003cbr\u003eof the final cast.\u003c\/p\u003e\r\n\u003cp\u003eSift or strew USG Dental Plaster - Impression into the water slowly and evenly. Do not drop large\u003cbr\u003eamounts of USG Dental Plaster - Impression directly into the water as proper soaking of the\u003cbr\u003eUSG Dental Plaster - Impression may not occur. USG Dental Plaster - Impression should be fully\u003cbr\u003edispersed in the water prior to mixing. Small batches require less soaking time than large batches.\u003cbr\u003eSee USG IG503 Plaster Mixing Procedures for specific soaking instructions.\u003c\/p\u003e\r\n\u003cp\u003eMixing USG Dental Plaster - Impression slurry is one of the most important steps in producing\u003cbr\u003eUSG Dental Plaster - Impression casts with maximum strength, absorption, hardness and other\u003cbr\u003eimportant properties.\u003c\/p\u003e\r\n\u003cp\u003eMechanically mixed slurries develop uniform casts with optimal strengths. USG Dental Plaster -\u003cbr\u003eImpression can be mechanically mixed through both batch and continuous processes. Proper blade\u003cbr\u003eand bucket dimensions are important for obtaining the best batch mix (see USG IG503 Plaster\u003cbr\u003eMixing Procedures for details).\u003c\/p\u003e\r\n\u003cp\u003eLonger mixing times result in higher mold strength and shorter set times.\u003c\/p\u003e\r\n\u003cp\u003ePOURING\u003c\/p\u003e\r\n\u003cp\u003eTo prevent air entrainment and provide a uniform, smooth surface, careful pouring of USG Dental\u003cbr\u003ePlaster - Impression slurry is necessary. Agitation\/vibration of the filled mold is a further step used\u003cbr\u003eto prevent air at or near the mold surface. Whenever possible, USG Dental Plaster - Impression\u003cbr\u003eslurry should be poured carefully in the deepest area so that the slurry flows evenly across the\u003cbr\u003esurface of the case mold.\u003c\/p\u003e\r\n\u003cp\u003ePouring a large amount of slurry directly on the face of the case mold may result in slight\u003cbr\u003edensification of the USG Dental Plaster - Impression mold at the point where it strikes the surface of\u003cbr\u003ethe case. This produces a hard spot, giving uneven absorption.\u003c\/p\u003e\r\n\u003cp\u003eDRYING\u003c\/p\u003e\r\n\u003cp\u003eAll casts should be dried as quickly as is safely possible after manufacture so that maximum\u003cbr\u003ephysical properties can develop. Dry to a constant weight.\u003c\/p\u003e\r\n\u003cp\u003eThe best drying rooms or ovens provide 1) uniform and rapid circulation (minimum of 15-30 fps\u003cbr\u003e(4.6-9.1 mps)) of air with no “dead spots” having little or no air movement, 2) equal temperatures\u003cbr\u003ethroughout the entire area, and 3) provisions for exhausting a portion of the air while replacing\u003cbr\u003eit with fresh air. High humidity surrounding the drying room or oven inhibits drying efficiency\u003cbr\u003ebecause the air pulled into the room is incapable of picking up much moisture from the molds.\u003c\/p\u003e\r\n\u003cp\u003eThe maximum temperature at which USG Dental Plaster - Impression molds are safe from calcination\u003cbr\u003eis 120 °F (49 °C). With substantial free water in the mold, a higher drying temperature can be used\u003cbr\u003ewithout difficulty. As drying progresses, the temperature must be reduced to prevent calcination.\u003cbr\u003eBefore removing molds from the dryer, the temperature should approach that of the area around\u003cbr\u003ethe dryer to prevent thermal shock. See IG502 Drying Plaster Casts for additional information.\u003c\/p\u003e\r\n\u003cp\u003eSTORAGE AND USE\u003c\/p\u003e\r\n\u003cp\u003eWhen properly used, USG Dental Plaster - Impression is safe to handle and easy to work with.\u003cbr\u003eKeep indoors at temperatures between 65 °F – 75 °F (18 °C – 24 °C) and 45% – 55% RH. Do not\u003cbr\u003estack more than two pallets high. Keep from drafts. Rotate stock. USG Dental Plaster - Impression\u003cbr\u003eshould be used within six months of the manufacturing date located on the package. Always follow\u003cbr\u003ehandling and use directions and safety warnings on the package.\u003c\/p\u003e\r\n\u003cp\u003e\u003ca href=\"https:\/\/www.usg.com\/content\/dam\/USG_Marketing_Communications\/united_states\/sds\/usg-dental-plasters-sds-en-52000000137.pdf\" target=\"_blank\" rel=\"noopener\"\u003eSDS\u003c\/a\u003e\u003c\/p\u003e","brand":"USG","offers":[{"title":"25lb","offer_id":48015593701691,"sku":null,"price":27.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/gallery-large876657_971379c9-b17e-4e37-87e9-69529196fd95.jpg?v=1713651668","url":"https:\/\/maacaffestore.com\/products\/dental-impression-plaster","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}