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titanium [Ti]is used extensivelly in Osteosynthesis, however tha major problem is the allergic reaction of human body especially toward the Nickel which do exist as a kind of impurity in almost every alloy. So, Titanium must be prepared accordingly to that degree or grade of purity which is called medical grade I or II and containing no more than 0,05% of Nickel.
I would translate as "titanium de categorie or de qualite medicale".