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Enlarged view of finite element models of the four implant iterations with cortical bone graft (pink). (a) InterPlate titanium device with dynamic surface features (springs), (b) InterPlate titanium non-dynamic device without teeth, (c) InterPlate design in titanium without teeth and having a fully enclosed graft chamber, (d) InterPlate design in unfilled PEEK without teeth and having a fully enclosed graft chamber.
