Die Stones Used In Dentistry Write a short note on the die stone. Answer: Die Stone: Die stone is of two types, i.e. Type IV: Die stone with high strength low expansion Type V: Die stone with low strength and high expansion. Properties of Die Stone: Manipulation of Die Stone: The thick mix should be prepared and vibrated in a rubber base impression. … [Read more...] about Die Stones Used In Dentistry
Dental Materials
Hemihydrate
Hemihydrate Write short notes on α and β hemihydrates. Answer: Alpha Hemihydrate: It is also known as a type III gypsum product or dental stone or hydrocal. Manufacture of Alpha Hemihydrate: Here gypsum is calcined under steam pressure in an autoclave at 120°C to 130°C at 17 lbs/sq inch for 5 to 7 hours. So the product obtained is much stronger and harder. … [Read more...] about Hemihydrate
Dental Plaster
Dental Plaster Add in detail about the setting reaction of dental plaster and add a note on the uses of different gypsum products. Or Write in detail the setting reaction of calcium sulphate dihydrate. Answer: Setting Reaction of Dental Plaster: When 1 g mol of calcium sulfate hemihydrates reacts with 1.5 g mol of water, the hemihydrates reverts to dihydrate forming … [Read more...] about Dental Plaster
Dental Gypsum And Investments
Dental Gypsum And Investments Classify gypsum products. Describe the setting reaction and microscopic structure of the set material. Answer: Setting Reaction of Gypsum Products: When 1 gram mol of calcium sulfate hemihydrates reacts with 1.5 gram mol of water, the hemihydrates reverts to dihydrate forming 1 gram mol of calcium sulfate dihydrate by hydration, with … [Read more...] about Dental Gypsum And Investments
Cold Mould Seal-Separating Medium
Cold Mould Seal-Separating Medium Question 1. What is the mechanism of action of cold mould seal? Answer: When cold mold seal is applied to dry plaster surface sodium alginate reacts with calcium sulphate to form insoluble skin of calcium alginate on the plaster surface which in turn blocks the porosities on the surface of plaster. Thus, any other material that comes in … [Read more...] about Cold Mould Seal-Separating Medium