Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Laboratory of Polymers Chemistry and Technology, Department of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Int J Mol Sci. 2023 Jan 20;24(3):2067. doi: 10.3390/ijms24032067.
Nanofillers in resin materials can improve their mechanical and physicochemical properties. The present work investigated the effects of zirconia nanoparticles (NPs) as fillers in commercial dental luting cements. Two dual-cured self-adhesive composites and one resin modified glass ionomer (RMGI) luting cement were employed. Film thickness (FT), flexural strength (FS), water sorption (), and shear bond strength (SBS) to monolithic zirconia were evaluated according to ISO 16506:2017 and ISO 9917-2:2017, whereas polymerization progress was evaluated with FTIR. Photopolymerization resulted in double the values of %. The addition of 1% wt NPs does not significantly influence polymerization, however, greater amounts do not promote crosslinking. The sorption behavior and the mechanical performance of the composites were not affected, while the film thickness increased in all luting agents, within the acceptable limits. Thermocycling (TC) resulted in a deteriorating effect on all composites. The addition of NPs significantly improved the mechanical properties of the RMGI cement only, without negatively affecting the other cements. Adhesive primer increased the initial SBS significantly, however after TC, its application was only beneficial for RMGI. The MDP containing luting cement showed higher SBS compared to the RMGI and 4-META luting agents. Future commercial adhesives containing zirconia nanoparticles could provide cements with improved mechanical properties.
纳米填料在树脂材料中可以改善其机械和物理化学性能。本工作研究了氧化锆纳米颗粒（NPs）作为商业牙科水门汀填料的影响。使用了两种双固化自粘接复合材料和一种树脂改性玻璃离子水门汀（RMGI）。根据 ISO 16506：2017 和 ISO 9917-2：2017 评估了薄膜厚度（FT）、弯曲强度（FS）、溶胀（）和对整体氧化锆的剪切结合强度（SBS），而聚合进展则用 FTIR 进行评估。光聚合导致值增加一倍。添加 1%wt NPs 不会显著影响聚合，但添加更多的 NPs 不会促进交联。复合材料的溶胀行为和力学性能不受影响，而所有水门汀的薄膜厚度都增加，在可接受的范围内。冷热循环（TC）对所有复合材料都有恶化作用。纳米颗粒的添加显著提高了 RMGI 水门汀的力学性能，而对其他水门汀没有负面影响。粘结剂底漆显著提高了初始 SBS，但 TC 后，其应用仅对 RMGI 有益。含 MDP 的水门汀与 RMGI 和 4-META 水门汀相比，具有更高的 SBS。未来含有氧化锆纳米颗粒的商业粘结剂可以为水门汀提供改善的机械性能。
