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

Purpose: 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.

Materials And Methods: 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.

Results: 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).

Conclusions: 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.