Stress distribution and bone–implant interface behavior in pick-up implant impression

Conclusions The mechanical properties of Pattern Resin LS seem to be appropriate for use in the pick-up impression technique thanks to the low-volume contraction, the capabilities to dampen misfits, and permanent deformation effects. The shape of the copings affects the values of the stress both in the transfer coping–implant connection zones and at resin–transfer coping interfaces. A thicker clearance of the module–tray connection helps in reducing the mechanical stress. The FEM analysis showed that the removal procedure of the pick-up implant impression tray does not produce any irreversible damage on the cortical and trabecular bone structure. Since the yield threshold was high, the stress distribution at the bone–implant–coping configurations was largely within the safety range for the multiple internal-connection implants, in combination with a modular individual impression tray.
Source: International Journal of Stomatology and Occlusion Medicine - Category: Dentistry Source Type: research