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A Study on surface of various abutment screws
Chan-Ik Park, Chae-Heon Chung, Han-Cheol Choi, Dae-Hwa Back
박창익, 정채현, 최한철, 백대화

Statement of problem : Regardless of any restoration, most of case, we used in screw connection
between abutment and implant. For this reason, implant screw loosening has been remained
problem in restorative practices.
Purpose : The purpose of this study was to compare surface of coated/plated screw with tita-
nium and gold alloy screw  and to evaluate physical property of coated/plated material after
scratch test in FESEM investigation
Material and methods : GoldTite, titanium screw provided by 3i (Implant Innovation, USA)
and TorqTite, titanium screw by Steri-Oss (Nobel Biocare, USA) and gold screw, titanium screw
by AVANA (Osstem Implant, korea) - were selected for this study. Each abutment screw sur-
face was observed at 100 times, and then screw crest, root, and slope were done more
detailed numerical value, at 1000 times with FESEM. A micro-diamond needle was also
prepared for the scratch test. Each abutment screw was fixed, micro-diamond scratch the sur-
face of head region was made at constant load and then was observed central region and periph-
ery of fine trace through 1000 times with FESEM.
Results : The surface of GoldTite was smoother than that of other kinds of screw and had abun-
dant ductility and malleability compared with titanium and gold screw.The scratch test
also showed that teflon particles were exfoliated easily in screw coated with teflon.Titanium
screw had a rough surface and low ductility.
Conclusion : It was recommended that the clinical use of gold-plated screw would prevent a
screw from loosening.
Clinical use of gold-plated screw would prevent a screw from loosening because it had
abundant ductility and malleability compared with titanium and gold screw.

* Keywords: Screw loosening, Screw surface treatment, FESEM, Scratch test

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