Biomechanical evaluation of resistance to insertion torque of different implant systems and insertion driver types

The aim of this study was to quantify the resistance to torque of different implant systems and their connection devices using in vitro torsion tests.

Three internal connection systems, 1 conventional system with internal torque and 1 conventional system with a mounting device used as a control group were tested on 5 groups.

Rupture torque (in newton meter): Biomet 3i Certain group 4 showed a statistically significant higher average (2.65 N·m), followed in order by Biomet 3i Osseotite group 5 (2.18 N·m), Bonelike group 2 (1.80 N·m). Angle deformation/rupture: all groups obtained similar values, without significant differences. Elastic limit (in newton meter): Bonelike group 2 (1.06 N·m) showed similar behavior to group 1 (1.39 N·m) (Nobel Biocare), without significant differences, whereas Bonelike group 3 showed a significantly lower value (0.93 N·m). Maximum torque (in newton meter): Biomet 3i Certain group 4 showed significantly higher values in relation to other groups (2.80 N·m).

The greater contact area the system is built on, the greater resistance against insertion torque, as internal hexagon implants with a greater contact area and external hexagon implants using a mounting device showed higher resistance to insertion torque.