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Graphene functionalized with nanosilver particle-modified methacrylate-based bonding agent improves antimicrobial capacity and mechanical strength at tooth orthodontic bracket interface
Polymer Composites ( IF 5.2 ) Pub Date : 2021-08-18 , DOI: 10.1002/pc.26265
Nozha M. Sawan 1 , Eman I. AlSagob 1 , Afnan A. Ben Gassem 2 , Abeer A. Alshami 1
Affiliation  

The purpose of this study was to formulate and characterize functionalized graphene nanoplatelets (GNP) with silver nanoparticles (AgNPs) and evaluate the antimicrobial and mechanical properties of GNP-Ag-modified adhesives bonded to orthodontic brackets. The morphology and physiochemical properties of nanoparticles were studied. The functionalized nanoparticles were incorporated at 0.25 and 0.5 wt% into experimental orthodontic adhesives (Transbond XT) and characterized for their biological, antimicrobial capacity, degree of conversion (DC), shear bond strength (SBS), and adhesive remnant index (ARI). Among the experimental groups, the specimen treated with 0.25 wt% modified experimental adhesive had the highest mean DC score (40.8 ± 6.5), shear bond strength (9.8 ± 1.8), lowest mean adhesive remnant index scores (1.35 ± 0.78), and the lowest cytotoxicity effect after 72 h (p < 0.001). However, 0.5 wt% GNP-Ag modified experimental adhesive specimens showed a greater relative antibiofilm viability against S. mutans after 24 h and 30 days in comparison to 0.25 wt%. Our study found that 0.25 wt% revealed substantial increase in antibacterial properties and therefore could be used for bonding orthodontic brackets to the enamel surface without compromising bond strength.

中文翻译:

纳米银粒子改性甲基丙烯酸酯基粘合剂功能化的石墨烯可提高牙齿正畸托槽界面的抗菌能力和机械强度

本研究的目的是用银纳米粒子 (AgNPs) 配制和表征功能化石墨烯纳米片 (GNP),并评估 GNP-Ag 改性粘合剂粘合到正畸托槽上的抗菌和机械性能。研究了纳米颗粒的形貌和理化性质。将功能化纳米粒子以 0.25 和 0.5 重量%的比例掺入实验性正畸粘合剂 (Transbond XT) 中,并对其生物学、抗菌能力、转化度 (DC)、剪切粘合强度 (SBS) 和粘合剂残留指数 (ARI) 进行表征。在实验组中,用 0.25 wt% 改性实验粘合剂处理的试样具有最高的平均 DC 得分(40.8 ± 6.5),剪切粘合强度(9.8 ± 1.8),最低的平均残胶指数得分(1.35 ± 0.78),p  < 0.001)。然而,与 0.25 重量%相比,0.5 重量% GNP-Ag 改性实验粘合剂样品在 24 小时和 30 天后显示出更大的抗变形链球菌的相对抗生物膜活力。我们的研究发现,0.25 wt% 显示抗菌性能显着增加,因此可用于将正畸托槽粘合到牙釉质表面,而不会影响粘合强度。
更新日期:2021-08-18
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