| Summary: | 碩士 === 國立臺灣大學 === 臨床牙醫學研究所 === 103 === With the advances of dental implants, temporary skeletal anchorage devices have now become established orthodontic anchorage aids and launched a new era for clinical orthodontic therapy. In recent years, numerous publications have investigated multiple factors affecting success rates of orthodontic mini-screws, such as shape design, material science, or surface topography. The success rate of 316L stainless steel orthodontic miniscrews was found to be lower than titanium alloy, and our research goal was to make surface modification by coating a TiO2 thin film on 316L stainless steel, which aimed to improve the biocompatibility and induce osseointegration.
The 316L stainless steel plates were used in this study to test mechanical conditions. The experimental variables were included as follow: 1. Coating methods : ion-beam assisted electron beam evaporation and sol-gel method for titanium;2 Coating thickness, ranging from 30 to 500 nm; 3. Surface roughness. The composition and crystalline phase were analyzed by Energy Dispersive Spectrometer (EDS) and X-ray diffraction analyzer (XRD). The surface and cross-section of films were examined by scanning electron microscope. And the color three-dimensional laser scanning analyzer was used to analyze the surface roughness of films. Finally, the film adhesion under various coating parameters was evaluated by a scratch test machine. Besides, all the data would compare with the previous results of magnetron sputtering and produce a comprehensive view of those results.
The study results showed that TiO2 thin film with good quality and dense
structure can be coated on 316L stainless steel by magnetron sputtering, electron beam
evaporation, and sol-gel method. The magnetron sputtering can produce best results regarding to film adhesion and crystallization structure. The sol-gel method also could produce thin film with good adhesion property and crystallization structure after rapid thermal annealing. However, the ion-beam assisted electron beam evaporation can produce thin film with dense structure, but the adhesion property was poorer than magnetron sputtering and sol-gel method. Besides, the film thickness played an important role in the adhesion property, and the surface roughness was not altered by the coating.
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