Yazdani Negar, Ashrafi Hossein, Özcan Mutlu, Nekoueimehr Negin, Kholdi Mohsen, Farzad Azin
Faculty of Dentistry, Kashan University of Medical Sciences, Kashan 8715988141, Iran.
Department of Applied Design, Faculty of Mechanical Engineering, University of Kashan, Kashan 8731753153, Iran.
Materials (Basel). 2022 Aug 10;15(16):5504. doi: 10.3390/ma15165504.
Due to an increase in prevalence of cervical lesions, it is important to use appropriate restorative materials to reduce the incidence of secondary lesions. Owing to having antibacterial properties, cervical composite restorations containing different ratios of Zinc Oxide nanoparticles (ZnO NPs) have been analyzed using the Finite Element method to determine the optimal incorporation ratio from mechanical and thermal perspectives. A numerical simulation is conducted for a mandibular first premolar with a cervical lesion (1.5 × 2 × 3 mm) restored with composites containing 0 to 5% wt. ZnO NPs. Subsequently, the samples are exposed to different thermo-mechanical boundary conditions, and stress distributions at different margins are examined. The accumulated stress in the restoration part increases for the 1% wt. sample, whereas the higher percentage of ZnO NPs leads to the reduction of stress values. In terms of different loading conditions, the least and most stress values in the restoration part are observed in central loading and lingually oblique force, respectively. The change in the surface temperature is inversely correlated with the ratio of ZnO NPs. In conclusion, the composite containing 5% wt. ZnO NPs showed the most proper thermo-mechanical behavior among all samples.
由于宫颈病变的患病率增加，使用合适的修复材料以降低继发病变的发生率很重要。由于具有抗菌性能，已使用有限元方法分析了含有不同比例氧化锌纳米颗粒（ZnO NPs）的宫颈复合修复体，以便从力学和热学角度确定最佳掺入比例。对患有宫颈病变（1.5×2×3毫米）的下颌第一前磨牙用含有0至5%重量比ZnO NPs的复合材料进行修复的情况进行了数值模拟。随后，将样品暴露于不同的热机械边界条件下，并检查不同边缘处的应力分布。对于1%重量比的样品，修复部分的累积应力增加，而较高百分比的ZnO NPs会导致应力值降低。在不同加载条件下，修复部分的最小和最大应力值分别出现在中心加载和舌侧斜向力作用时。表面温度的变化与ZnO NPs的比例呈负相关。总之，在所有样品中，含有5%重量比ZnO NPs的复合材料表现出最适宜的热机械性能。
