This example shows the different behaviour of a conical threaded implant in case of osseointegration condition (Fig. 1) and bone-implant detachment condition (Fig. 2).
Different values of the Young's modulus are assumed for the different regions of bone around the implant. In particular, in the case in Fig.1, the Young's modulus is set at the value of 1.5 GPa, both for the transition region between implant and cortical bone and the transition region between implant and trabecular bone. For the case reported in Fig. 2 the Young's modulus is set at the value of 0.6 GPa, both for the transition region between implant and cortical bone and the transition region between implant and trabecular bone. A gap between bone and implant has been considered too; it must be intended as the zone, between implant and bone, where the mechanical properties of the bone tissue are so poor that can be considered null. This represent a limit condition that is shown at with educational purpose only. An intrusive force of 200 N is applied.
The magnitude displacement fields for the two cases is depicted. It is evident that the load transfer is strongly influenced by the presence of the thread and by the shape of the implant, ensuring a better distribution of the load with respect to the case of a smoothed implant.

3. Three Dimensional Models

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