Shear Strength of the Cylindrical Titanium Implant–Plastic System

Analysis of the combination of the “titanium implant–bone tissue” using the model of the composite material “cylindrical titanium implant–plastic,” where plastic with the shear strength of 62.3 MPa simulates the bone tissue, was performed. The shear strength of the “cylindrical titanium implant–plastic” system increases with the increase of the macro- and microrelief of the titanium surface in the series smooth surface, processed by abrasive, with three-dimensional capillary-porous (TCP) titanium coating, with TCP Ti coating and microplasma oxidation—2.9, 29, 44.65, and 52.27 MPa respectively. In this case, the shear strength of plastic in this combination increases from 3 to 92%. Analysis of the shear strength of coatings during microplasma oxidation in phosphate and silicate electrolytes with the addition of hydroxyapatite, calcium gluconate, or citrate was conducted. The best result of 57.27 MPa was obtained using the phosphate electrolyte containing synthetic hydroxyapatite (HA). In this case, when samples were subjected to shear, the destruction of samples occurred with plastic simulating the bone tissue. In samples with three-dimensional capillary-porous titanium coating at the average shear strength of 44.65 MPa, the fracture surface passes along the top of the coating.