Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University and National Taiwan University Hospital, Taipei 106, Taiwan.
Graduate Institute of Applied Mechanics and Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei City, 10617, Taiwan.
Colloids Surf B Biointerfaces. 2021 Jan;197:111440. doi: 10.1016/j.colsurfb.2020.111440. Epub 2020 Oct 25.
Magnetic attachment system is used to embed in polymethyl methacrylate (PMMA) resin denture base to improve denture stability. However, dislodgement of magnetic attachments from denture base is a major clinical problem. This study is to evaluate the bond strength between PMMA and stainless steel using metal primer and atmospheric pressure plasma jet (APPJ) treatment. Stainless steel discs were treated with Single Bond Universal Adhesive; Palfique Universal Bond; Alloy Primer; heat treatment with Alloy Primer; and 10-s, 20-s, and 30-s APPJ treatment with Alloy Primer. The shear bond strength between PMMA and surface-treated stainless steel was measured using universal testing machine. The effects of N flow rate (60, 50, 40, 30 SLM), thermal cycling, and air quenching on shear bond strength were also investigated. The surface of each disc was examined using X-ray photoelectron spectroscopy and a goniometer. Finally, the temperature of plasma with various N flow rates was measured and the optical emission spectra of the plasma were measured using spectrometer. Alloy Primer produced the highest bond strength. APPJ treatment was effective at enhancing bond strength by cleaning the surface of contaminants. Moreover, APPJ treatment with air quenching increased surface O/OH- and FeO/FeOOH ratios, reducing the negative influence of thermal cycling on bond strength. Alloy Primer with 20 s of APPJ treatment with a 50-SLM N flow rate and air quenching was the most effective at increasing bond strength.
磁性附着体系统用于嵌入聚甲基丙烯酸甲酯（PMMA）树脂义齿基托中，以提高义齿的稳定性。然而，磁性附着体从义齿基托上脱落是一个主要的临床问题。本研究旨在评估使用金属底漆和常压等离子射流（APPJ）处理 PMMA 和不锈钢之间的结合强度。不锈钢圆盘用单键通用胶粘剂、Palfique 通用胶粘剂、合金底漆、合金底漆热处理和 10 秒、20 秒和 30 秒 APPJ 处理。使用万能试验机测量 PMMA 与表面处理后的不锈钢之间的剪切结合强度。还研究了 N 流量（60、50、40、30 SLM）、热循环和空冷对剪切结合强度的影响。使用 X 射线光电子能谱仪和测角仪检查每个圆盘的表面。最后，测量了不同 N 流量下等离子体的温度，并使用光谱仪测量了等离子体的发射光谱。合金底漆产生的结合强度最高。APPJ 处理通过清洁表面污染物有效提高了结合强度。此外，空气淬火的 APPJ 处理增加了表面 O/OH-和 FeO/FeOOH 的比例，降低了热循环对结合强度的负面影响。具有 50-SLM N 流量和空气淬火的 20 秒 APPJ 处理的合金底漆在提高结合强度方面最有效。
