Dental Materials

Water Quality Effects On Gypsum Die Properties Describe its properties, water/powder ratio and setting expansion. Or Give the composition and properties of dental plaster. Answer: Gypsum is a mineral mined in various parts of the world. Gypsum is also an industrial by-product. Gypsum was fist found in mines around the city of Paris, so it is also called the “Plaster of … [Read more...] about Water Quality Effects On Gypsum Die Properties

Crazing Of Acrylic Resins Write a short note on crazing. Answer: Crazing is the formation of very fine microcracks or flaws on the surface of the denture. Mechanism of Formation: It occurs due to the mechanical separation of individual polymer chains on the application of tensile stresses. Crazing starts from the surface of resin and is oriented at a right angle … [Read more...] about Crazing Of Acrylic Resins

Gypsum Products What are gypsum products? Or Write about manufacturing and theories of setting of gypsum products. Answer: Most commonly used materials that produce positive replication of oral structures are known as gypsum products. Gypsum products are derived from mineral gypsum which is chemically known as calcium sulfate dihydrate. When powdered gypsum get heated … [Read more...] about Gypsum Products

Setting Expansion Of Gypsum Write a short note on setting expansion. Answer: Setting expansion is of two types: Normal settng expansion Hygroscopic setting expansion. 1. Normal Setting Expansion: All gypsum products show a linear expansion during setting, due to the outward thrust of the growing crystals. Crystals growing from the nuclei not only intermesh … [Read more...] about Setting Expansion Of Gypsum

Hygroscopic Expansion Of Dental Investments Write a short note on hygroscopic setting expansion. Or Write a brief on hygroscopic expansion. Or Write briefly on hygroscopic setting expansion. Or Write in brief on hygroscopic expansion. Answer: When a gypsum product is placed underwater before the initial set stage, a greater expansion is seen. This is due to … [Read more...] about Hygroscopic Expansion Of Dental Investments