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The effect of the use of a counter-torque device on the abutment-implant complex
1School of Dentistry, University of North Carolina, Chapel Hill, NC 27599-7450, USA.
Statement Of Problem:
Little is known about the condition of the abutment-screw joint before loading, after the development of the preload.
Purpose:
This study examined the tightening force transmitted to the implant with and without the use of a counter-torque device during the tightening of the abutment screw.
Materials And Methods:
Forty Brânemark implants and 10 CeraOne, Estheticone, Procera, and AurAdapt abutments formed the experimental populations. Samples in each group were further divided into 2 groups, 1 group was tightened with a torque controller without the use of a counter-torque device, whereas the other used the counter-torque device. Samples were positioned in a special holder within the grips of a Tohnichi BTG-6 torque gauge for measuring transmitted forces.
Results:
There were significant differences (P =. 0001) in the tightening forces transmitted to the implant with and without the use of a counter-torque device when tightening the abutment screws.
Conclusion:
An average of 91% of the recommended preload tightening torque was transmitted to the implant-bone interface in the absence of a counter-torque device. In all abutment systems, less than 10% of the recommended preload tightening torque was transmitted to the implant when the counter-torque device was used.