Faltermeier Andreas, Rosentritt Martin, Faltermeier Rupert, Reicheneder Claudia, Müssig Dieter
Department of Orthodontics, University Clinics, University of Regensburg, Regensburg, Germany.
Angle Orthod. 2007 May;77(3):494-8. doi: 10.2319/0003-3219(2007)077[0494:IOFLOT]2.0.CO;2.
To evaluate the effect of different filler contents of orthodontic adhesives on shear bond strength and Adhesive Remnant Index (ARI).
Four experimental adhesive groups were created: group 1 was an unfilled urethane-dimethacrylate (UDMA) adhesive, group 2 consisted of UDMA and a filler content of 30 vol%, group 3 consisted of UDMA and a filler content of 50 vol%, and group 4 was manufactured with a filler level of 70 vol% in a UDMA matrix. The embedded filler was silicon dioxide. After etching and priming, stainless steel brackets were bonded to extracted human third molars (n = 60) with the experimental adhesives (15 teeth per group). After storage in distilled water for 72 hours, shear bond strength and ARI scores were evaluated. Kruskal-Wallis and post hoc test were performed for statistical analysis.
Shear bond strength of UDMA-based adhesives depends on filler content. Higher adhesive filler levels reveal greater bond strength between enamel and stainless steel brackets. ARI scores showed no significant difference among the groups. However, higher filled adhesives (filler content 70 vol%) seem to present higher ARI scores.
Highly filled UDMA adhesives offer greater bond strength than do lower filled or unfilled resins.
评估不同填料含量的正畸粘合剂对剪切粘结强度和粘结剂残留指数（ARI）的影响。
创建四个实验性粘合剂组：第1组是未填充的聚氨酯二甲基丙烯酸酯（UDMA）粘合剂，第2组由UDMA和30体积%的填料组成，第3组由UDMA和50体积%的填料组成，第4组在UDMA基质中制造，填料水平为70体积%。嵌入的填料是二氧化硅。酸蚀和涂底漆后，用实验性粘合剂（每组15颗牙）将不锈钢托槽粘结到拔除的人类第三磨牙上（n = 60）。在蒸馏水中储存72小时后，评估剪切粘结强度和ARI评分。进行Kruskal-Wallis检验和事后检验以进行统计分析。
基于UDMA的粘合剂的剪切粘结强度取决于填料含量。较高的粘合剂填料水平显示牙釉质与不锈钢托槽之间的粘结强度更大。各组之间的ARI评分无显著差异。然而，填料含量较高的粘合剂（70体积%）似乎呈现出较高的ARI评分。
高填料含量的UDMA粘合剂比低填料含量或未填充的树脂具有更大的粘结强度。
