| http://www.w3.org/ns/prov#value | - A bioactive glass, is generally composed of the elements silicon, calcium, phosphorus, sodium, and oxygen, although other elements such as boron, potassium, magnesium and fluorine for example, may be added to modify various characteristics, as disclosed in U.S. Pat. Nos. 4,103,002, 4,775,646 and 4,851 ,046, the disclosure of which is incorporated herein by reference.
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