To use Elsner System's Vario-Tube, a special arched screwdriver is required, which is the proprietary development of the Elsner group. When inserting implants at an angle, it is a major technical challenge to tighten the screws with adequate force, as due to the tilted angle the head of a regular screwdriver will not make contact with the surfaces on all sides, meaning that if greater than necessary force is applied it can start free rotating and hence damage the screw.
To manage this problem the most suitable solution is to use a torx T6 screw and screwdriver. Thanks to its special design it can divert from the axis direction by up to 25°, and it can provide suitable rotating force even when screwing at an angle.
When using such force as recommended by the manufacturer, screws can be tightened and loosened without being damaged, even in cases where high degree of axis divergence is present.