Department of Prosthodontics, The Affiliated Stomatological Hospital of Nanjing Medical University, Jiangsu Province Key Laboratory of Oral Diseases, Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing, People's Republic of China.
Int J Nanomedicine. 2024 Mar 5;19:2113-2136. doi: 10.2147/IJN.S446584. eCollection 2024.
Poor interfacial bonding between the fibers and resin matrix in fiber-reinforced composites (FRCs) is a significant drawback of the composites. To enhance the mechanical properties of FRC, fibers were modified by depositing SiO nanofilms via the atomic layer deposition (ALD) technique. This study aims to evaluate the effect of ALD treatment of the fibers on the mechanical properties of the FRCs.
The quartz fibers were modified by depositing different cycles (50, 100, 200, and 400) of SiO nanofilms via the ALD technique and FRCs were proposed from the modified fibers. The morphologies, surface characterizations of nanofilms, mechanical properties, and cytocompatibility of FRCs were systematically investigated. Moreover, the shear bond strength (SBS) of FRCs to human enamel was also evaluated.
The SEM and SE results showed that the ALD-deposited SiO nanofilms have good conformality and homogeneity. According to the results of FTIR and TGA, SiO nanofilms and quartz fiber surfaces had good chemical combinations. Three-point bending tests with FRCs showed that the deposited SiO nanofilms effectively improved FRCs' strength and Group D underwent 100 deposition cycles and had the highest flexural strength before and after aging. Furthermore, the strength of the FRCs demonstrated a crescendo-decrescendo tendency with SiO nanofilm thickness increasing. The SBS results also showed that Group D had outstanding performance. Moreover, the results of cytotoxicity experiments such as cck8, LDH and Elisa, etc., showed that the FRCs have good cytocompatibility.
Changing the number of ALD reaction cycles affects the mechanical properties of FRCs, which may be related to the stress relaxation and fracture between SiO nanofilm layers and the built-up internal stresses in the nanofilms. Eventually, the SiO nanofilms could enhance the FRCs' mechanical properties and performance to enamel by improving the interfacial bonding strength, and have good cytocompatibility.
纤维增强复合材料（FRC）中纤维与树脂基体之间的界面结合不良是复合材料的一个显著缺点。为了提高 FRC 的力学性能，通过原子层沉积（ALD）技术在纤维上沉积 SiO 纳米薄膜对纤维进行了改性。本研究旨在评估纤维的 ALD 处理对 FRC 力学性能的影响。
通过原子层沉积（ALD）技术在石英纤维上沉积不同循环（50、100、200 和 400）的 SiO 纳米薄膜，制备了 FRC。系统研究了 FRC 的形貌、纳米薄膜的表面特性、力学性能和细胞相容性，此外，还评估了 FRC 与人牙釉质的剪切结合强度（SBS）。
SEM 和 SE 结果表明，ALD 沉积的 SiO 纳米薄膜具有良好的一致性和均一性。根据 FTIR 和 TGA 的结果，SiO 纳米薄膜和石英纤维表面具有良好的化学结合。三点弯曲试验表明，沉积的 SiO 纳米薄膜有效地提高了 FRC 的强度，D 组经过 100 次沉积循环，在老化前后具有最高的弯曲强度。此外，随着 SiO 纳米薄膜厚度的增加，FRC 的强度呈现出先增大后减小的趋势。SBS 结果也表明 D 组表现出色。此外，细胞毒性实验（如 cck8、LDH 和 Elisa 等）的结果表明，FRC 具有良好的细胞相容性。
改变 ALD 反应循环的数量会影响 FRC 的力学性能，这可能与 SiO 纳米薄膜层之间的应力松弛和断裂以及纳米薄膜内部的内应力有关。最终，SiO 纳米薄膜可以通过提高界面结合强度来增强 FRC 对牙釉质的机械性能和性能，并具有良好的细胞相容性。
