| http://www.w3.org/ns/prov#value | - in which M is an alkaline earth metal and MO is barium oxide and barium oxide binary and ternary mixtures with other alkaline earth metal oxides, such as BaO, BaO--CaO, BaO--SrO and CaO--BaO--SrO. Such preferred source of fluoride not ocoating bues long term fluoride release from the primary coating but it also provides an essentially uniform release of fluoride over that period of time.
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