Abstract
Purpose
This study evaluated the torque maintenance of universal abutment retaining screws using different tightening techniques, and coated or uncoated screws.
Material and method
The screws were tightened to implants as following: Control – 32 Ncm torque; H20 – holding 32 Ncm torque for 20 s; R – 32 Ncm torque, repeated after 10 min (retorque); and H20+R – combining the two tightening techniques. Titanium and coated screws were also evaluated.
Result
Statistical analysis showed higher maintained torque for titanium screws (p<0.001). The H20+R technique showed the highest maintained torque (p=0.003), but the H20 technique’s maintained torque was similar.
Conclusion
Titanium screws associating the two tightening techniques can improve maintained torque.
Descriptors:
Implant-supported dental prosthesis; dental implant-abutment design; torque