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標題: | 大氣壓電漿射流對於合金底劑作用於聚甲基丙烯酸甲酯與不鏽鋼之間鍵結能力的增強作用 Atmospheric pressure plasma jet enhances the effect of Alloy Primer on the bond strengths of polymethyl methacrylate to stainless steels |
作者: | Chen-ting Hsu 徐振庭 |
指導教授: | 李伯訓 |
關鍵字: | 大氣壓電漿,金屬底劑,不鏽鋼,聚甲基丙烯酸甲酯,剪切鍵結強度, plasma,metal primer,stainless steel,polymethylmethacrylate,shear bond strength, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 磁吸式的覆蓋式活動義齒 (Magnetic overdenture) 擁有許多臨床上的優點,對於全口無牙的患者是一個良好的治療選項。然而臨床使用上,磁鐵從義齒基底脫落的情況十分常見。臨床使用的磁鐵外層大多由抗腐蝕的不鏽鋼包覆,活動義齒的基底則以聚甲基丙烯酸甲酯 (Polymethylmethacrylate, PMMA) 這種聚合物作為主體。要提升磁吸式的覆蓋式活動義齒臨床表現,不鏽鋼與聚合物之間需要有更強的鍵結力。
電漿可以改變材料表面性質,進一步提升材料表面之間化學鍵結的形成。大氣壓電漿 (Atmospheric pressure plasma jet, APPJ) 在一大氣壓下就能穩定產生,不需要真空設備,是一種經濟而有效率的表面處理方式。 本實驗的目標是要探討APPJ對於不鏽鋼和PMMA之間鍵結力的增強效果。實驗設計使用APPJ搭配金屬底劑 (Alloy Primer) 對不鏽鋼圓盤 (AUM20) 進行表面處理;不使用APPJ直接塗佈三種不同的金屬底劑 (Single Bond Universal、Palfique Universal Bond、Alloy Primer) 作為對照組。使用APPJ的組別有多種的設定,包含了不同的電漿處理時間 (10 s、20 s、30 s) 和不同的冷卻時間 (0 min、2 min、1 h、3 h)。試片表面處理完後與PMMA 接合,使用萬能試驗機測量樹脂與表面處理過的不鏽鋼之間的剪切鍵結強度。電漿射流中的氮氣流速 (60 SLM、50 SLM、40 SLM、30 SLM)、冷熱循環疲勞測試和空氣淬火 (Air-quenching) 對剪切鍵結強度的影響也進行了深入的研究。本實驗紀錄了電漿處理前後的不鏽鋼表面水接觸角的變化,並使用 X 射線光電子能譜來分析不鏽鋼表面化學元素的組成。最後,使用 K 型熱電偶測量了不同氮氣流量下電漿焰尖的溫度,並研究了電漿的發射光譜。 實驗結果顯示Alloy Primer 在這三種商業產品中產生了最高的剪切鍵結強度。 APPJ 減小金屬表面水接觸角並去除表面碳污染物,顯著地提升金屬與樹脂間的鍵結力。此外,採用空氣淬火的 APPJ 處理進一步地提高了表面 O2- / OH- 和 Fe2O3 / FeOOH 的比率,從而減少了熱循環對鍵結強度的負面影響。 從本實驗有限的結果可知,APPJ 結合空氣淬火作用 20 s(N2 流速為 50 SLM)並且搭配使用金屬底劑的表面處理方式,對於提高 PMMA 和不鏽鋼之間的剪切鍵結強度最為有效。 Magnetic overdenture has many clinical advantages and is a good treatment option for edentulous patients. However, in clinical situations, the magnets commonly fall off from the denture base. The outer layer of clinically used magnets are mostly covered with corrosion-resistant stainless steel, and the denture base is mainly composed of polymers such as polymethylmethacrylate (PMMA). To improve the clinical performance of Magnetic overdentures, a stronger bonding force is needed between stainless steel and polymer. Plasma can change the surface properties of the material and further improve the chemical bonding between the materials. Atmospheric pressure plasma jet (APPJ) can be produced stably under atmospheric pressure. It does not require vacuum equipment and is an economical and efficient surface treatment method. The aim of this study was to explore the effect of APPJ on the bonding force between stainless steel and PMMA. The experimental design used APPJ in combination with a metal primer (Alloy Primer) for surface treatment of stainless steel discs (AUM20); without using APPJ, three different metal primers (Single Bond Universal, Palfique Universal Bond, and Alloy Primer) were directly applied as a control group. There were various settings for the groups using APPJ, including different plasma treatment time (10 s, 20 s, 30 s) and different cooling time (0 min, 2 min, 1 h, 3 h). Subsequently, the stainless steel discs were bonded to PMMA, and the shear bond strengths between PMMA and surface-treated stainless steel were measured using an universal testing machine at a constant crosshead speed of 1 mm/min. The effects of N2 flow rate (60 SLM, 50 SLM, 40 SLM, 30 SLM), thermal-cycling fatigue test, and air-quenching (a 2-cm-long quartz tube with a 1.7-cm-diameter side hole during APPJ treatment) on shear bond strength were also investigated. This experiment also recorded the differences in water contact angle of the stainless steel surface before and after plasma treatment and uses X-ray photoelectron spectroscopy to analyze the changes of chemical composition on the stainless steel surface. Finally, K-type thermocouples were used to measure the temperature of the plasma at different nitrogen flow rates and optical emission spectra from the plasma were investigated using a spectrometer. Experimental results showed that Alloy Primer produced the highest bond strengths among the 3 commercial products. APPJ treatment removed the surface carbon contaminants and decreased the water contact angle, which significantly improved the bond strengths. In addition, APPJ treatment with air quenching increased the surface ratio of O2- / OH- and Fe2O3 / FeOOH, therefore reducing the negative impact of thermal cycling on bond strengths. Within the limitations of the present study, the following conclusion were drawn: Alloy Primer in combination with APPJ treatment for 20 s with 50 SLM of N2 flow rate and air quenching were the most effective in increasing the shear bond strengths between PMMA and stainless steel. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63360 |
DOI: | 10.6342/NTU202000762 |
全文授權: | 有償授權 |
顯示於系所單位: | 臨床牙醫學研究所 |
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