What is the dried dental cement ions reaction with the exposed gases in the air?
Will there be any change in the response?
In all of the enumerated dental cements the powder consisting in one or more ingredients is generally hydroscopic in nature and often subject to oxidation so that exposure to moisture or air, even in capped bottles or containers, will change the desired chemical constituents. In the case of the unstable liquid, alteration, dilution or oxidation is even more serious and presents great problems to the dental laboratory or dentist who from time to time must quickly spatulate the essential ingredients, powder and liquid from sources at hand in his laboratory.
rocess of preparing and producing dental cements for assuring accurate chemical balance of ingredients
US 3336669 A
www.google.co.in/patents/US3336669
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