Department of Orthodontics, Faculty of Dentistry, Kocaeli University, Kocaeli, Turkey.
Angle Orthod. 2012 Jan;82(1):36-41. doi: 10.2319/041211-265.1. Epub 2011 Jul 25.
To evaluate and compare the effects of enamel microabrasion, casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), and their combination on the shear bond strength (SBS) of orthodontic brackets bonded to demineralized enamel surface.
One hundred human first premolar teeth were randomly allocated to one of five groups. Group I was considered as the control of other groups. For the remaining groups, demineralization was performed via solutions. In group II, brackets were directly bonded to the demineralized enamel surface. CPP-ACP was applied in group III, microabrasion was performed in group IV, and both microabrasion and CPP-ACP application were performed in group V. The specimens were tested for SBS. Bond failures were scored according to the Adhesive Remnant Index (ARI). Analysis of variance and Tukey tests were used to compare the SBS of the groups. ARI scores of the groups were evaluated with a G-test. The statistical significance was set at P <. 05 level.
Statistically significant difference was found among the five investigated groups (F = 111.870; P < .001). The SBS of groups II and IV were significantly lower than the other groups. No statistically significant difference was found among groups I (control; mean 24.1 ± 4.1 MPa), III (mean 22.0 ± 3.6 MPa), and V (mean 24.3 ± 1.9 MPa). Microabrasion and combination with CPP-ACP showed higher SBS compared to the control group. The differences between ARI scores of the groups were statistically significant (P < .001).
CPP-ACP pretreatment, microabrasion of the enamel, and the combination of these two methods improve the bonding to demineralized enamel.
评估和比较釉质微研磨、酪蛋白磷酸肽-无定形磷酸钙（CPP-ACP）及其组合对黏附于脱矿釉质表面的正畸托槽剪切粘结强度（SBS）的影响。
将 100 个人的第一前磨牙随机分配到 5 个组之一。第 1 组被认为是其他组的对照。对于其余组，通过溶液进行脱矿处理。第 2 组将托槽直接黏附于脱矿釉质表面。第 3 组应用 CPP-ACP，第 4 组进行微研磨，第 5 组同时进行微研磨和 CPP-ACP 应用。对标本进行 SBS 测试。根据黏附残余指数（ARI）对黏附失败进行评分。使用方差分析和 Tukey 检验比较各组的 SBS。使用 G 检验评估各组的 ARI 评分。统计显著性水平设为 P <.05。
5 个研究组之间存在统计学显著差异（F = 111.870；P <.001）。第 2 组和第 4 组的 SBS 显著低于其他组。第 1 组（对照组；平均 24.1 ± 4.1 MPa）、第 3 组（平均 22.0 ± 3.6 MPa）和第 5 组（平均 24.3 ± 1.9 MPa）之间的 SBS 无统计学显著差异。与对照组相比，微研磨和 CPP-ACP 联合应用显示出更高的 SBS。各组间 ARI 评分的差异具有统计学意义（P <.001）。
CPP-ACP 预处理、釉质微研磨以及这两种方法的联合应用可改善对脱矿釉质的黏附。
