Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
BMC Oral Health. 2014 Mar 29;14:28. doi: 10.1186/1472-6831-14-28.
The effects of fluoride and CPP-ACP before bracket bonding on the shear bond strength of orthodontic brackets have been reported with contradicting results. The objective of this in vitro study was to evaluate the effect of different preventive agents namely; casein phosphopeptide-amorphous-calcium-phosphate (CPP-ACP), fluoride-containing-CPP-ACP (CPP-ACPF) and 5% sodium fluoride (5% NaF), on the enamel-bracket shear bond strength (SBS) and to compare their effects when applied before or after acid-etching.
Human premolar teeth were randomly divided into seven groups (16 teeth per group) as follows: the control group, where no preventive agent was applied on the enamel and 6 experimental groups. Teeth in groups 1a, 2a, and 3a were treated with CPP-ACP paste, CPP-ACPF paste, and 5% NaF, respectively before acid-etching. Teeth in groups 1b, 2b and 3b were treated using the same preventive agents after acid-etching. The brackets were then bonded and the teeth were thermocycled. The brackets' SBS was measured and the adhesive remnant was assessed using adhesive remnant index (ARI). Analysis of variance (ANOVA) and Tukey test were performed to compare the SBS among different groups. Chi-square test was used to evaluate differences in ARI scores between the groups.
Enamel surface treatment with CPP-ACPF after acid-etching significantly increased SBS compared to the control and to its application before acid-etching (P < 0.05). Higher ARI index was recorded when the preventive agents were applied after acid-etching.
Brackets' SBS significantly increased when fluoride-containing-CPP-ACP was applied after acid-etching.
已有研究报道了氟化物和 CPP-ACP 在托槽粘接前对正畸托槽粘结强度的影响，但结果相互矛盾。本体外研究的目的是评估不同预防剂，即酪蛋白磷酸肽-无定形磷酸钙（CPP-ACP）、含氟 CPP-ACP（CPP-ACPF）和 5%氟化钠（5% NaF）对釉质-托槽粘结强度（SBS）的影响，并比较它们在酸蚀前或酸蚀后应用的效果。
将人前磨牙随机分为 7 组（每组 16 颗牙）：对照组，釉质表面不使用任何预防剂；其余 6 组为实验组。组 1a、2a 和 3a 的牙齿在酸蚀前用 CPP-ACP 糊剂、CPP-ACPF 糊剂和 5% NaF 处理，组 1b、2b 和 3b 的牙齿在酸蚀后用相同的预防剂处理。然后粘接托槽并进行热循环。测量托槽的 SBS，并使用粘固剂残留指数（ARI）评估粘固剂残留量。采用方差分析（ANOVA）和 Tukey 检验比较不同组间 SBS 的差异。采用卡方检验比较各组间 ARI 评分的差异。
酸蚀后用 CPP-ACPF 处理釉质表面与对照组和酸蚀前应用相比，SBS 显著增加（P<0.05）。酸蚀后应用预防剂时，ARI 指数更高。
酸蚀后应用含氟 CPP-ACP 可显著提高托槽的 SBS。
