Fluorescent agents are added to orthodontic adhesives with the aim of making them visible under ultraviolet (UV) light, which ensures the complete, safe removal of remnants after orthodontic treatment. However, it is necessary to evaluate if the mechanical strength of these materials is maintained. Therefore, this study evaluated whether the addition of fluorescent agents influences the shear bond strength and clinical performance of a UV light-sensitive adhesive system. This study consisted of two stages: (1) In vitro phase: 40 human teeth were selected, divided at random into 2 groups (n = 20), according to the adhesive system used: UV group—adhesive with fluorescent agent, and control group—conventional adhesive. A shear bond strength test was performed using a DL 2000 universal testing machine, at a speed of 0.5 mm/min. The accessories were removed and an evaluation of the Adhesive Remnant Index (ARI) was carried out. (2) Clinical phase: 8 patients were selected and had their appliances bonded using the split-mouth design (160 teeth) with the same tested adhesive systems (UV, n = 80; control, n = 80). The patients were monitored for bonding failure for a period of 24 months. Statistical analysis was performed using the Independent t test, chi-squared tests, and Mann-Whitney test, at a level of significance of 5% and confidence interval of 95%. Regarding the in vitro phase, the shear bond strength test yielded similar results in the two groups (p > 0.05) and the ARI showed statistically significant differences between the groups with a score of 1 being the most frequent ARI for both groups (70%). In addition, there was no clinical difference in terms of bonding failure between the groups (p > 0.05). The addition of fluorescent elements does not alter the mechanical strength and performance of the orthodontic adhesive and represents a viable alternative for clinical application.

中文翻译：

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荧光剂会改变正畸粘合剂的机械强度吗？一种在体外和临床研究

将荧光剂添加到正畸粘合剂中，目的是使它们在紫外线（UV）下可见，以确保在正畸治疗后彻底，安全地清除残留物。但是，有必要评估这些材料的机械强度是否得以维持。因此，本研究评估了添加荧光剂是否会影响紫外线敏感胶粘剂体系的剪切粘合强度和临床性能。该研究包括两个阶段：（1）体外阶段：根据所使用的粘合剂体系，选择40只人类牙齿，随机分为2组（n = 20）：UV组-荧光剂粘合剂和对照组。 —常规胶粘剂。使用DL 2000通用测试机以0.5mm / min的速度进行抗剪强度测试。除去附件，并进行残留粘合指数（ARI）的评估。（2）临床阶段：选择8例患者，并使用裂口设计（160颗牙齿）使用相同的测试粘合系统（紫外线，n = 80；对照组，n = 80）将其装置粘合。监测患者的粘合失败24个月。使用Independent t检验，卡方检验和Mann-Whitney检验进行统计分析，显着性水平为5％，置信区间为95％。在体外阶段，两组的剪切粘结强度测试获得相似的结果（p> 0.05），ARI显示两组之间的统计差异显着，得分最高的两组均为ARI（70％） 。此外，两组之间在粘合失败方面无临床差异（p> 0.05）。荧光元素的添加不会改变正畸粘合剂的机械强度和性能，是临床应用的可行选择。