The aim of this study was to investigate orthodontics brackets shear bond strength (SBS) after pretreatment of bleached enamel surface with different laser types in comparison with antioxidants agent. A total of 150 sound human premolars were randomly assigned to into a control group which was experimental group (Group A) as bleached with 40% HP bleaching agent and not bleached (Group B). Then, both control and experimental groups were divided into five subgroups. Subgroup 1: no surface treatment Subgroup 2: treated by Nd:YAG laser (1 W, 100 μ s, 10 Hz) for 30 s. Subgroup 3: treated by Er: YAG laser (0.5 W, 230 μ s, 10 Hz, 5 mm distance) for 30 s. Subgroup 4: treated by CO 2 laser (0.5 W, 10 Hz, pulse width of 1 ms) for 30 s. Subgroup 5: conditioned by 10% sodium ascorbate solution for 10 min. Then, the metal premolar brackets were bonded to conditioned enamel surface. All the specimens were debonded using the Unive...

中文翻译：

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不同类型的激光和抗氧化剂办公室漂白釉表面预处理对正畸托槽抗剪强度的影响

这项研究的目的是研究与抗氧化剂相比，用不同的激光类型对漂白瓷釉表面进行预处理后的正畸托槽剪切粘结强度（SBS）。将总共​​150个健全的人类前磨牙随机分为对照组，即实验组（A组），用40％HP漂白剂漂白而不漂白（B组）。然后，将对照组和实验组分为五个亚组。第1组：无表面处理第2组：用Nd：YAG激光（1 W，100μs，10 Hz）处理30 s。第3组：用Er：YAG激光（0.5 W，230μs，10 Hz，5 mm距离）处理30 s。第4组：用CO 2激光（0.5 W，10 Hz，脉冲宽度1 ms）处理30 s。第5组：用10％抗坏血酸钠溶液处理10分钟。然后，将金属的前磨牙托槽粘结到条件良好的搪瓷表面。所有的标本都使用Unive进行了脱胶。