硅烷对 CAD-CAM 复合材料粘结的影响：界面断裂韧性研究。
Silane influence on bonding to CAD-CAM composites: An interfacial fracture toughness study.
机构信息
Dental Biomaterials Research Unit (d-BRU), Institute of Dentistry, University of Liège (ULiège), Liège, Belgium.
Dental Biomaterials Research Unit (d-BRU), Institute of Dentistry, University of Liège (ULiège), Liège, Belgium; Department of Fixed Prosthodontics, Institute of Dentistry, University of Liège Hospital (CHU), Liège, Belgium.
出版信息
Dent Mater. 2019 Sep;35(9):1279-1290. doi: 10.1016/j.dental.2019.05.019. Epub 2019 Jun 7.
OBJECTIVES
To evaluate silane influence on the interfacial fracture toughness (IFT) of composite cement, with the two sub-classes of CAD-CAM composites, polymer-infiltrated ceramic networks (PICN) and dispersed fillers (DF), after hydrofluoric acid etching (HF) or airborne-particle abrasion (AB). A secondary objective was to correlate results with developed interfacial area ratio (Sdr) and surface wettability.
METHODS
Experimental PICN and DF blocks were cut into equilateral half-prisms, which were treated with HF or AB, then treated with an experimental silane or not and bonded to their counterparts with an experimental light-cure resin cement. After thermocycling, samples (n=30 per group) were tested for IFT using the notchless triangular prism test in a water bath at 36°C. Moreover, profilometry and contact angle measurement were performed on rectangular samples of each group. Finally, bonding interface was analysed by SEM.
RESULTS
PICN-HF treated with silane showed the highest IFT significantly. Three-way ANOVA revealed the influence of silane, material class and surface pre-treatment (HF or AB) on IFT (p<0.05). When silane was used, IFT was correlated with Sdr, while surface wettability was increased. Silane application significantly increased IFT for PICN but not for DF, while PICN performed better with HF and DF with AB.
SIGNIFICANCE
Silane increases IFT of composite cement with PICNs, but not with DF materials. Results suggest that silane increases the micromechanical bond by promoting resin cement spreading and penetration in surface roughness. This roughness is significantly higher for pre-treated PICNs than for DF due to their specific honeycomb microstructure when etched, which explains their better bonding properties.
目的
评估硅烷对复合水门汀界面断裂韧性（IFT）的影响，涉及 CAD-CAM 复合材料的两个亚类，即聚合物渗透陶瓷网络（PICN）和分散填料（DF），经过氢氟酸蚀刻（HF）或喷砂处理（AB）。次要目的是将结果与开发的界面面积比（Sdr）和表面润湿性相关联。
方法
将实验性 PICN 和 DF 块切割成等边半棱柱，用 HF 或 AB 处理，然后用实验性硅烷处理或不处理，并与实验性光固化树脂水门汀粘合。热循环后，使用无缺口三角棱柱试验在 36°C 的水浴中对样品（每组 30 个）进行 IFT 测试。此外，对每组的矩形样品进行轮廓测量和接触角测量。最后，通过 SEM 分析粘结界面。
结果
经硅烷处理的 PICN-HF 显示出最高的 IFT 值，差异有统计学意义。三因素方差分析显示硅烷、材料类别和表面预处理（HF 或 AB）对 IFT 的影响（p<0.05）。当使用硅烷时，IFT 与 Sdr 相关，而表面润湿性增加。硅烷的应用显著增加了 PICN 的 IFT，但不增加 DF 的 IFT，而 PICN 对 HF 有效，DF 对 AB 有效。
意义
硅烷增加了 PICN 复合水门汀的 IFT，但不增加 DF 材料的 IFT。结果表明，硅烷通过促进树脂水门汀在表面粗糙度中的扩散和渗透来增加微机械结合。经过蚀刻后，由于其特定的蜂窝状微观结构，预处理的 PICN 的表面粗糙度明显高于 DF，这解释了它们更好的粘结性能。
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