aufsatzsammlung biocompatiblematerials biomateriais biomecanica biomechanicalphenomena biomechanics biomechanik biomedicalmaterials boneandbones bones effectofimplantson implantedeossoorganico knochen materials materialstesting mechanicalproperties mechanicalstress methods orthopedicimplants ossoeossos physiology prosthesesandimplants prosthesis proteseseimplantes surfaceproperties surplusgovernmentproperty tensilestrength testing