Deformation of internal thread of dental implants on repeated abutment screw tightening
Objective: To evaluate the surface changes of internal threads of the implant that occurs after repeated tightening and loosening of the abutment screw.
Methodology: MIS implant analogue of dimension 13x3.5 mm were mounted. Light body impression was made to copy the internal threads of dental implant before abutment screw tightening. The impression surface was then studied under a stereomicroscope to visualize the surface of implant threads. Abutment screw was tightened and removed eight times from the implant, followed by making a light body impression of the internal threaded surface of the implant to visually analyse the surface changes under stereomicroscope.
Results: The distance between four threads measured before and after screw tightening using Progres image pro software, the values were before screw tightening 1.923 mm and 1.861 and after screw tightening 1.901 mm 1.843 respectively. No significant difference was observed.
Conclusions: It can be concluded that there is no change in the internal threads of the implant on repeated screw tightening and loosening.