dental materials midterm correctly answered rated A+

dental materials midterm the most accurate impressions are made with which type of trays - correct answer custom trays which impression material is classified as an irreversible hydrocolloid? - correct answer alginate which impression material is classified as a reversible hydrocolloid and requires special equipment? - correct answer agar a replica of a single tooth - correct answer die what material requires the use of a water bath and water-cooled impression trays - correct answer wax identify the impression materials that are classified as inelastic or rigid materials - correct answer plaster, wax, ZOE which impression material is supplied in two tubes of contrasting color, sets to a brittle mass and smells like oil of cloves? - correct answer ZOE an impression gives a _______ reproduction of the oral tissue - correct answer negative list the two factors that will affect the mixing and setting times of alginate impression material (2) - correct answer water temp and water/powder ratio if an alginate impression is left in the mouth for a few extra minutes and the removal time is delayed, the strength and elasticity will - correct answer increase what is the instructions for mixing alginate impression material - correct answer pour the water into the powder, mix gently at first to incorporate the powder into the water, strope the material against the side of the bowl for approximately one minute when seating an impression tray, which portion of the tray is usually seated first - correct answer posterior what is hysteresis - correct answer the characteristic of reversible hydrocolloids whereby they do not melt and gel at the same temperature how can alginate impressions be stored - correct answer 100% humidity for no more than 30 minutes chemically composed of calcium sulfate dihydrate particles - correct answer gypsum rock made from gypsum by controlled calcination under steam pressure in a closed container - correct answer dental stone made from gypsum in a calcium chloride solution - correct answer improved or high strength dental stone processed by heating gypsum in a open container - correct answer plaster processed by heating gypsum in a solution of calcium chloride - correct answer improved or high strength dental stone when mixing gypsum products water is added to the powder and allowed to settle for approximately 30 seconds T or F - correct answer true