Evaluation of screw loosening of prosthetic abutments in implants with internal hexagon and morse taper connections after fatigue testing
International Journal of Development Research
Evaluation of screw loosening of prosthetic abutments in implants with internal hexagon and morse taper connections after fatigue testing
Received 14th January, 2022; Received in revised form 29th January, 2022; Accepted 09th February, 2022; Published online 19th March, 2022
Copyright © 2022, Cristine Haralambos Bassoukou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Aim: To verify the counter-torque required for screw removal from prosthetic abutments on internal hexagon and Morse taper implants after mechanical cycling. Ten internal hexagon implants (IH- Titamax II plus” 3,75 x 13 mm - Neodent) and ten Morse taper implants (MT-Titamax Cone Morse” 3,75 x 13 mm- Neodent) were used, where the implants IH received the abutment of 4,5 x 6 x 1 mm and the MT implants received the solid abutment of 4,5 x 6 x 0,8 mm. The samples received a 20 Ncm torque, recommended by the manufacturer, with a digital torquemeter, and after a period of 10 minutes, all samples were torqued with 20 Ncm again. Groups were subjected to mechanical loading, with 100 Ncm load, 90° to the long axis, per 212,600 cycles at 25 Hz. Subsequently, removal torque was measured with the same digital torquemeter. After the mechanical cycling there was no difference on the removal torque measured on the internal hexagon and Morse taper abutment-implants (Mann-Whitney test p=0,257). The present study suggests that the Internal Hexagon and Morse taper connections presented similar removal torque values after mechanical cycling, and there was no superiority of a system in relation to the other.
