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Improving Polymethyl Methacrylate Resin Using Novel Nano-Ceramic Coating

机译:使用新型纳米陶瓷涂料改进聚甲基丙烯酸甲酯树脂

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摘要

Objectives: Poly methyl methacrylate (PMMA) has been broadly used in dentistry. Unfortunately, PMMA has poor surface wear resistance, is relatively porous, and promotes adhesion of complex oral biofilms associated with oral mucositis and systemic co-morbidities. The Aim of this study is to improve the surface physical and chemical characteristics of PMMA by developing a novel, thin film, nano-ceramic coating process, and to analyze the resulting coated surface.;Methods: Atomic Layer Deposition (ALD) technique was developed to deposit a titanium dioxide (TiO2) nano-ceramic thin film on PMMA. The surface wettability for both coated and uncoated PMMA was determined by water contact angle. Wear resistance was performed using a mechanical tooth-brushing device with a load of 50g for 6000 strokes after 5-month water storage. Chemical and mechanical challenge test was performed by using sonication in 3.8% sodium perborate (Polident denture cleanser) for 1 hour with aged specimens. X-ray photoelectron spectroscopy (XPS) was utilized before and after the brushing test and challenge test to analyze the PMMA surface chemical composition. The mechanical strength of coated and uncoated PMMA was measured by three-point bending with a universal testing machine (n=10). Surface microbial interactions were evaluated using C. albicans attachment and biofilm formation test.;Results: Nano-ceramic TiO2 coating (30 nm-thick) was successfully deposited on PMMA at 65°C. After coating, water contact angle decreased from 67° to less than 5°, indicating formation of a super-hydrophilic surface. After brushing test, the ceramic coating remained intact. XPS analysis revealed no loss of TiO2 from coated samples following brushing and denture cleanser sonication for 1 hour. There was no statistically significant difference in mechanical strength (MPa) (Mean+/-SD) between PMMA (139.37+/-11.34) and TiO2-PMMA (160.65+/-37.07). C. albicans attachment decreased by 63% on the coated PMMA surface. C. albicans biofilm formation decreased by 53% on the coated PMMA surface.;Conclusions: ALD is a promising technique to modify surface properties of PMMA and resulted in a stable adherent thin film. By depositing a TiO2 nano-ceramic coating, PMMA surface properties may lead to significantly reduced microorganism adhesion and easier pathogen removal from PMMA. For patients who wear dentures, reducing the oral microbial biofilm burden using a TiO2 coated PMMA surface could positively impact their oral and systemic health.
机译:目标:聚甲基丙烯酸甲酯(PMMA)已被广泛用于牙科。不幸的是,PMMA具有差的表面耐磨性,相对多孔,并促进与口腔粘膜炎和全身性合并症相关的复杂口腔生物膜的粘附。这项研究的目的是通过开发一种新颖的薄膜纳米陶瓷涂层工艺来改善PMMA的表面物理和化学特性,并分析所形成的涂层表面。方法:开发了原子层沉积(ALD)技术在PMMA上沉积二氧化钛(TiO2)纳米陶瓷薄膜。涂覆和未涂覆的PMMA的表面润湿性均通过水接触角确定。储水5个月后,使用机械式牙刷装置以50g的载荷进行6000次冲程的耐磨性。通过在老化的样品中于3.8%的过硼酸钠(Polident假牙清洁剂)中超声处理1小时,进行化学和机械挑战试验。 X射线光电子能谱法(XPS)在刷牙试验和激发试验之前和之后均用于分析PMMA表面化学成分。涂覆和未涂覆的PMMA的机械强度是通过万能试验机(n = 10)通过三点弯曲来测量的。使用白色念珠菌附着和生物膜形成测试评估了表面微生物的相互作用。结果:在65°C成功地将纳米陶瓷TiO2涂层(厚30 nm)沉积在了PMMA上。涂布后,水接触角从67°降至小于5°,表明形成了超亲水性表面。刷涂测试后,陶瓷涂层保持完整。 XPS分析显示,刷牙和义齿清洁剂超声处理1小时后,涂层样品中的TiO2没有损失。 PMMA(139.37 +/- 11.34)和TiO2-PMMA(160.65 +/- 37.07)之间的机械强度(MPa)(均值±SD)差异无统计学意义。白色念珠菌附着在涂层的PMMA表面上减少了63%。在涂层的PMMA表面上,白色念珠菌生物膜的形成减少了53%。;结论:ALD是一种有前途的技术,可以改变PMMA的表面性能并产生稳定的粘附薄膜。通过沉积TiO2纳米陶瓷涂层,PMMA的表面性能可能导致微生物粘附力显着降低,并且更容易从PMMA中去除病原体。对于使用假牙的患者,使用TiO2涂层的PMMA表面减少口腔微生物膜的负担可能会对他们的口腔和全身健康产生积极影响。

著录项

  • 作者

    Darwish, Ghaith.;

  • 作者单位

    University of Illinois at Chicago.;

  • 授予单位 University of Illinois at Chicago.;
  • 学科 Health education.;Horticulture.;Microbiology.
  • 学位 M.S.
  • 年度 2018
  • 页码 51 p.
  • 总页数 51
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 遥感技术;
  • 关键词

  • 入库时间 2022-08-17 11:38:59

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