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Abstract：
BACKGROUND: enamel demineralization is a common side effect of orthodontic therapy with fixed braces. The aim of the present in vitro study was to compare a conventional adhesive system and a modern adhesive system (APC Flash-Free [FF] technology) with regard to the demineralization of enamel by Streptococcus sobrinus (S. sobrinus).
METHODS: this in vitro study included premolar teeth and compared APC FF adhesive brackets (Group A, n = 15) with conventional adhesive brackets (Group B, n = 15) from the same company. Specimens were incubated with a positive control group (PCG, n = 5) and a negative control group (NCG, n = 5) in an S. sobrinus suspension for three weeks. To evaluate the grade of enamel demineralization, the samples were analyzed using a polarizing microscope.
RESULTS: the test specimens of group B with conventionally bonded bracket adhesive showed significantly greater (+10.8 μm) demineralization with regard to the penetration depth of the demineralization than the PCG (p = 0.012). Thus, there was a difference from group A with the new bracket adhesive of the FF brackets (+7.29 μm). Significantly, demineralization was more pronounced cervically than coronally in both groups, and it occurred cervically more frequently than grade 3 demineralization (p = 0.001).
CONCLUSIONS: it seems plausible that new orthodontic bracket adhesives and the modern FF adhesive system positively contribute to the reduction in enamel demineralization during orthodontic treatment.
METHODS: this in vitro study included premolar teeth and compared APC FF adhesive brackets (Group A, n = 15) with conventional adhesive brackets (Group B, n = 15) from the same company. Specimens were incubated with a positive control group (PCG, n = 5) and a negative control group (NCG, n = 5) in an S. sobrinus suspension for three weeks. To evaluate the grade of enamel demineralization, the samples were analyzed using a polarizing microscope.
RESULTS: the test specimens of group B with conventionally bonded bracket adhesive showed significantly greater (+10.8 μm) demineralization with regard to the penetration depth of the demineralization than the PCG (p = 0.012). Thus, there was a difference from group A with the new bracket adhesive of the FF brackets (+7.29 μm). Significantly, demineralization was more pronounced cervically than coronally in both groups, and it occurred cervically more frequently than grade 3 demineralization (p = 0.001).
CONCLUSIONS: it seems plausible that new orthodontic bracket adhesives and the modern FF adhesive system positively contribute to the reduction in enamel demineralization during orthodontic treatment.
摘要：
背景：牙釉质脱矿是固定牙套正畸治疗的常见副作用。本体外研究的目的是比较传统的粘合剂系统和现代的粘合剂系统（APC无Flash[FF]技术）对牙釉质的脱矿质作用。sobrinus）。
方法：这项体外研究包括前磨牙，并比较了APCFF粘合剂托槽（A组，n=15)，带常规粘合剂支架(B组，n=15）来自同一公司。将标本与阳性对照组（PCG，n=5）和阴性对照组（NCG，n=5）在S.sobrinus悬浮液中三周。为了评估牙釉质脱矿的等级，使用偏光显微镜分析样品。
结果:在脱矿质的渗透深度方面,具有常规粘结托槽粘合剂的B组试样显示出比PCG明显更大(+10.8μm)的脱矿质(p=0.012)。因此，使用FF支架的新支架粘合剂(+7.29μm)与A组有差异。重要的是,在两组中，宫颈脱矿比冠状脱矿更明显，宫颈脱矿的发生率高于3级（p=0.001）。
结论：新型正畸托槽粘合剂和现代FF粘合剂系统似乎有助于减少正畸治疗过程中的牙釉质脱矿。
方法：这项体外研究包括前磨牙，并比较了APCFF粘合剂托槽（A组，n=15)，带常规粘合剂支架(B组，n=15）来自同一公司。将标本与阳性对照组（PCG，n=5）和阴性对照组（NCG，n=5）在S.sobrinus悬浮液中三周。为了评估牙釉质脱矿的等级，使用偏光显微镜分析样品。
结果:在脱矿质的渗透深度方面,具有常规粘结托槽粘合剂的B组试样显示出比PCG明显更大(+10.8μm)的脱矿质(p=0.012)。因此，使用FF支架的新支架粘合剂(+7.29μm)与A组有差异。重要的是,在两组中，宫颈脱矿比冠状脱矿更明显，宫颈脱矿的发生率高于3级（p=0.001）。
结论：新型正畸托槽粘合剂和现代FF粘合剂系统似乎有助于减少正畸治疗过程中的牙釉质脱矿。
