Abstract
A combined experimental and numerical study on titanium porous microstructures intended to interface the bone tissue and the solid homogeneous part of a modern dental implant is presented. A specific class of trabecular geometries is compared to a gyroid structure. Limitations associated with the application of the adopted selective laser melting technology to small microstructures with a pore size of 500 m are first examined experimentally. The measured effective elastic properties of trabecular structures made of Ti6Al4V material support the computational framework based on homogenization with the difference between the measured and predicted Young’s moduli of the Dode Thick structure being less than 5%. In this regard, the extended finite element method is promoted, particularly in light of the complex sheet gyroid studied next. While for plastic material-based structures a close match between experiments and simulations was observed, an order of magnitude difference was encountered for titanium specimens. This calls for further study and we expect to reconcile this inconsistency with the help of computational microtomography.
Highlights
The porous microstructures introduced in Section 2.1.1 are compared both quantitatively and qualitatively on the basis of selected mechanical properties
Derived Mechanical Properties In Section 2.1.1, we proposed a route to fabricate specimens we expected to provide the response of printed microstructures in tension
The fracture was brittle and the fracture surface revealed a number of internal discontinuities, for trabecular specimens, not observed by initial inspection (Figure 5f)
Summary
While promoting more flexible implants to reduce stress shielding and long-term bone loss seems reasonable, their application may generate inadmissible interface stresses at some locations of the bone–implant interface [2,4]. It is the implant stiffness to bone stiffness ratio which deserves particular attention [5]. In this regard, an application of porous microstructures on the outer part of a stiff implant as a stabilizing element for relatively compliant human bone has attracted considerable interest, when potentially designing implants tailored to patient-specific conditions [6] complying with the current trend in bioengineering [7,8]
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