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. 2016 May 19;6:26222. doi: 10.1038/srep26222

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(a) The current density in a plain polymeric insert; (b) The current density in a smooth 3D CAD insert; (c) The current density in a layered PMMA insert; (d) The EFS at the bottom of the chamber with a plain polymeric insert; (e) The EFS at the bottom of the chamber with a smooth 3D CAD insert; (f) The EFS at the bottom chamber with the layered PMMA insert.