Klein-Junior Celso-Afonso, Zimmer Roberto, Coelho-de-Souza Fábio-Herrmann, Cantarelli Henrique, Júnior Maruí-Cezar-Ribeiro-da Rosa, Reston Eduardo-Galia
Lutheran University of Brazil, Canoas, Brazil.
Feevale University, Novo Hamburgo, Brazil.
J Clin Exp Dent. 2023 Sep 1;15(9):e714-e719. doi: 10.4317/jced.60729. eCollection 2023 Sep.
The aim of this study was to evaluate the nanoleakage and microtensile bond strength (μTBS) of an ethanol based-adhesive containing Titanium dioxide (TiO2) nanofibers to dentin.
TiO2 nanofiber was produced by electrospinning and it was inserted in an ethanol-based adhesive in 0.5, 1.5 and 2.5% by weight. The original adhesive did not receive nanofiber. The middle dentin was exposed by diamond saw under water-cooling and dentin was polished with wet 600-grit SiC abrasive paper. Resin composite build-ups were applied incrementally to the dentin after adhesive application. After storage in distilled water (24 hours/37°C) the teeth were sectioned perpendicularly to the bonded interface and sticks were obtained. Twenty-five sticks per group were tested by μTBS with a crosshead speed of 0.5mm/minute. The average values (MPa) obtained in each substrate were subjected to one-way ANOVA (α=0,05) with the tooth being considered the experimental unit. The nanoleakage pattern was observed in ten sticks per group and analyzed by Chi-square test (α=0,05).
There was no difference in μTBS among the experimental groups. However, there was a statistically significant difference among 2.5 % nanofiber adhesive, 0.5 % nanofibers and control groups, (=0,028) in relation to nanoleakage.
TiO2 nanofibers in 2.5% of weight inserted in dental adhesive reduced the nanoleakage, but did not improve the μTBS to dentin. Dentin-bonding agents, nanoleakage, tensile bond strength.
本研究旨在评估含二氧化钛（TiO₂）纳米纤维的乙醇基粘合剂与牙本质之间的纳米渗漏和微拉伸粘结强度（μTBS）。
通过静电纺丝制备TiO₂纳米纤维，并将其按重量的0.5%、1.5%和2.5%插入乙醇基粘合剂中。原始粘合剂未添加纳米纤维。在水冷条件下用金刚石锯暴露牙本质中层，并用湿的600目碳化硅砂纸打磨牙本质。在涂布粘合剂后，将树脂复合材料逐层施加于牙本质上。在蒸馏水中储存（24小时/37°C）后，将牙齿垂直于粘结界面切开，获得粘结柱。每组25个粘结柱以0.5mm/分钟的十字头速度进行μTBS测试。将每个基底获得的平均值（MPa）以牙齿作为实验单位进行单因素方差分析（α = 0.05）。在每组10个粘结柱中观察纳米渗漏模式，并通过卡方检验进行分析（α = 0.05）。
各实验组之间的μTBS没有差异。然而，在纳米渗漏方面，2.5%纳米纤维粘合剂组、0.5%纳米纤维组和对照组之间存在统计学显著差异（P = 0.028）。
在牙科粘合剂中插入2.5%重量的TiO₂纳米纤维可减少纳米渗漏，但未提高与牙本质的μTBS。牙本质粘结剂、纳米渗漏、拉伸粘结强度。
