Surface treatment of 316L stainless steel orthodontic miniscrew
Date Issued
2011
Date
2011
Author(s)
Wang, Ya-Ting
Abstract
316L stainless steel orthodontic miniscrews were quite popular in clinical orthodontics, especially in Taiwan. However, the success rate was not good as titanium alloy. We try to improve it by making osseointergration happened. In other words, our research goal was to do some surface modification of 316L stainless steel without changing its properties. The study was divided into two parts:
Part I: we learned the pros and cons of physical vapor deposition（PVD）and sol-gel method from literature review. Ti or TiO2 were coated on 316L stainless steel orthodontic miniscrews either by PVD or sol-gel method, which was supported by manufactory. After analyzing these products, we chose PVD for further investigation because of minimum or no change of the substrate.
Part II：Ti or TiO2 thin films were coated on 316L stainless steel sheet by electron beam evaporation. Then, we used FE-SEM（Field Emission Scanning Electron Microscope） and atomic force microscope（AFM）for analysis. It was found that specimen had austenite grains and grain boundary. The surface roughness was 61 ± 14.3 nm. Thin films attached on the rough surface, but the grooves caused by grain boundary were not filled in completely. There were also some gap between thin film and substrate. After being cut and polished, some film peeled off. However, grains produced by this technique could be small as 15 nm. With the same evaporation source, the higher deposition rate made the grain size larger. The surface roughness was greater, too. Furthermore, we also confirmed that no change in the surface roughness after coating.
Subjects
316L stainless steel orthodontic miniscrews
surface modification
electron beam evaporation
titanium
titanium dioxide
Type
thesis
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