| http://www.w3.org/ns/prov#value | - One cage which is particularly widely used is made up of a one-piece body made of biocompatible material such as a titanium alloy or a stainless steel, of which the upper surface and the lower surface have reliefs such as serrations of triangular cross section which are intended to provide anchoring in the overlying and underlying vertebral plates when the distraction effected between the vertebra
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