Department of Oral Health, IFPR, Federal Institute of Parana (IFPR), Londrina, Brazil.
Department of Orthodontics, UNOPAR (University of North Parana), Londrina, Brazil.
Prog Orthod. 2020 Feb 10;21(1):4. doi: 10.1186/s40510-020-0304-y.
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.
正畸胶中添加荧光剂的目的是使其在紫外 (UV) 光下可见，从而确保正畸治疗后残留物能够完全、安全地去除。然而，有必要评估这些材料的机械强度是否保持不变。因此，本研究评估了添加荧光剂是否会影响一种对紫外线敏感的黏结系统的剪切粘结强度和临床性能。
本研究分为两个阶段：（1）体外阶段：选择 40 个人类牙齿，随机分为 2 组（n = 20），根据使用的黏结系统：UV 组-含荧光剂的黏结剂，和对照组-常规黏结剂。使用 DL 2000 万能试验机以 0.5 mm/min 的速度进行剪切粘结强度测试。去除附件后，进行黏附残留指数（ARI）评估。（2）临床阶段：选择 8 名患者，采用分口设计（160 颗牙齿），使用相同的测试黏结系统（UV，n = 80；对照组，n = 80）黏结矫治器。对患者进行为期 24 个月的黏结失败监测。使用独立 t 检验、卡方检验和曼-惠特尼检验进行统计分析，置信区间为 95%，显著性水平为 5%。
在体外阶段，两组的剪切粘结强度测试结果相似（p > 0.05），ARI 显示组间有统计学显著差异，两组最常见的 ARI 评分为 1。此外，两组在黏结失败方面无临床差异（p > 0.05）。
添加荧光元素不会改变正畸黏结剂的机械强度和性能，是一种可行的临床应用替代方案。
