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The author observed the reaction of gingval tissues which were implanted with gold, Bosung alloy and copper, the constituents of gold alloy. Pure gold and bosung alloy strips produced slight inflammation but copper had sovere inflammation. Dense fibrous fascile were formed around the gold and Bosung alloy strips on 7th day. When gold and Bosung alloy strips were implanted, eptithelial memberane were occured on 14th day, but copper strips produced eplthelial memberane on 21th day.
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