通过原位二氧化硅纳米颗粒表面沉积实现甲基丙烯酸盐对氧化锆的键合。
Methacrylate bonding to zirconia by in situ silica nanoparticle surface deposition.
机构信息
Biomaterials Development and Control Center, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil.
Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
出版信息
Dent Mater. 2015 Jan;31(1):68-76. doi: 10.1016/j.dental.2014.11.011. Epub 2014 Dec 9.
OBJECTIVE
This study introduces an innovative method to enhance adhesion of methacrylate-based cements to yttria-stabilized zirconia (Y-TZP) by means of a silica-nanoparticle deposition process.
METHODS
Two alkoxide organic precursors, tetraethyl-orthosilicate (TEOS) and zirconium tert-butoxide (ZTB) were diluted in hexane at different concentrations in order to obtain several experimental materials to enhance deposition of a SiO(x) reactive layer to Y-TZP. This deposition was attained via sintering alkoxide precursors directly on pre-sintered zirconia (infiltration method—INF) or application on the surface of fully sintered zirconia (coating method—COA). Untreated specimens and a commercial tribochemical silica coating were also tested as controls and all the treated Y-TZP specimens were analyzed using SEM-EDX. Specimens were bonded using silane, adhesive and dual-cure luting cement and submitted to shear bond strength test after different water storage periods (24 h, 3-, 6- and 12-months).
RESULTS
SEM-EDX revealed Y-TZP surface covered by silica nanoclusters. The morphology of silica-covered Y-TZP surfaces was influenced by sintering method, employed to deposit nanoclusters. High bond strength (MPa) was observed when using COA method; highest TEOS percentage achieved the greatest bond strengths to Y-TZP surface (36.7±6.3 at 24 h). However, bonds stability was dependent on ZTB presence (32.9±9.7 at 3 months; 32.3±7.1 at 6 months). Regarding INF method, the highest and more stable resin-zirconia bond strength was attained when using experimental solutions containing TEOS and no ZTB. Both sintering methods tested in this study were able to achieve a bonding performance similar to that of classic tribochemical strategies.
SIGNIFICANCE
This study demonstrates that it is possible to achieve a reliable and long-lasting bonding between yttria-stabilized zirconia ceramic and methacrylate-based cements when using this novel, simple, and cost-effective bonding approach.
目的
本研究通过二氧化硅纳米颗粒沉积工艺，介绍了一种增强甲基丙烯酸酯基水泥与氧化钇稳定氧化锆（Y-TZP）黏附力的创新方法。
方法
将两种烷氧基有机前体，正硅酸乙酯（TEOS）和四丁氧基锆（ZTB）分别稀释在正己烷中，以获得几种实验材料，以增强 SiO(x)反应层对 Y-TZP 的沉积。通过直接在预烧结氧化锆上烧结烷氧基前体（渗透法—INF）或在完全烧结氧化锆表面施加（涂覆法—COA）来实现这种沉积。未处理的样品和商业的摩擦化学硅涂层也被作为对照进行测试，所有处理后的 Y-TZP 样品都使用 SEM-EDX 进行了分析。使用硅烷、胶黏剂和双固化黏固水泥将样品黏合，并在不同的水储存期（24 小时、3、6 和 12 个月）后进行剪切黏结强度测试。
结果
SEM-EDX 显示 Y-TZP 表面覆盖有二氧化硅纳米簇。用于沉积纳米簇的烧结方法影响了二氧化硅覆盖的 Y-TZP 表面的形态。当使用 COA 方法时，观察到高的黏结强度（MPa）；在使用 TEOS 的情况下，实现了最高的黏结强度（24 小时时为 36.7±6.3）。然而，黏结稳定性取决于 ZTB 的存在（3 个月时为 32.9±9.7；6 个月时为 32.3±7.1）。关于 INF 方法，当使用含有 TEOS 且不含 ZTB 的实验溶液时，实现了最高和更稳定的树脂-氧化锆黏结强度。本研究中测试的两种烧结方法都能够实现类似于经典摩擦化学策略的黏结性能。
意义
本研究表明，当使用这种新颖、简单且具有成本效益的黏合方法时，有可能在氧化钇稳定氧化锆陶瓷和甲基丙烯酸酯基水泥之间实现可靠且持久的黏合。
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