| http://www.w3.org/ns/prov#value | - It is preferred that the screw 140 is made of a cleaned and passivated 6AL-4V titanium alloy, although any other surgical grade material of comparable strength, such as but not limited to stainless steel, composites, plastics, and/or ceramics exhibiting sufficient strength and/or hardness to permit insertion into and retention within the selected substrate (e.g., bone).
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