HI.TECH HARD PLASTER HITECH ISI DENTAL PLASTER DENTL PLSTR TACH HARD HRD PALATER HARED HITECHISI impression compound dental impression putty dental impression pack dental impression methodology impression materials in dentistry pdf gypsum items in dentistry pdf do dental impressions hurt dental mortar versus mortar of paris dental mortar available to be purchased properties of gypsum items dental stone properties dental stone

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Dental HI TECH HARD PLASTER is typically used to create molds for dental applications including dentures and dental prostheses. Gyprock Dental HI TECH HARD PLASTER is used as a quick setting, fine casting plaster designed for dental applications. A powder, when mixed with water, that hardens to form a stonelike investment or model material. It is composed of a hemihydrate of gypsum (CaSO. 4· 2H2O), which differs in compression strength and expansion coefficient according to how it is treated and rehydrated.

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. Plaster of Paris sets in a very short period of time depending on the temperature of the mix and the air temperature. Typically, it can be de-molded in about 30 to 45 minutes. If it is cool to the touch it has at least set. But, the set time is not the same as cure time.

A high expansion crown and bridge die stone, formulated to produce a hard, glass-like surface. It has a high compressive strength that is non-brittle. Dental plaster is the beta form of calcium sulfate hemihydrate ( CaSo4 . 1/2 H2O). Whereas, the dental stone is a calcined gypsum derivative similar to but stronger than plaster of Paris, used for making dental casts and dies.

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