Purpose

To evaluate the influence of hydrofluoric acid (HF) contamination on the microtensile bond strength (μTBS) during dental repair procedures before and after application of different dentin adhesives (Optibond FL and Optibond XTR).

Materials and methods

Thirty-five human molars were ground down into the dentin and were randomly divided into seven groups (G1-G7; n = 5), G1 and G2 being the control groups. Only in the test groups (G3-G7) samples were subjected to HF (9,5%) contamination. Two adhesive systems, Optibond FL (G1, G3, G4, G6) and Optibond XTR (G2, G5, G7) were used. In G3-G5 the adhesive was applied before and after contamination, the test groups G6 and G7 were treated with a single adhesive application after contamination. After composite build-up, samples were stored in water (7 d) and μTBS was determined. Data were evaluated using Wilcoxon test (p < 0.05).

Results

Control group G2 showed significantly higher μTBS than G1. The HF-contamination did not result in a significant reduction of μTBS. The μTBS of the test groups treated with OptiBond XTR (G5, G7) were significantly higher than the test groups treated with OptiBond FL (G3, G4, G6) following the same procedure.

Conclusions

HF-contamination of dentin or the adhesive layer does not significantly impair the bond strength, if the adhesive is subsequently re-applied.

中文翻译：

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牙科修复过程中氢氟酸蚀刻前的粘合剂应用？

目的

评估在使用不同牙本质粘合剂（Optibond FL 和 Optibond XTR）之前和之后的牙科修复过程中氢氟酸 (HF) 污染对微拉伸粘合强度 (μTBS) 的影响。

材料和方法

将 35 颗人磨牙磨成牙本质，随机分为 7 组（G1-G7；n = 5），G1 和 G2 为对照组。只有在测试组 (G3-G7) 中的样品受到 HF (9.5%) 污染。使用了两种粘合剂系统，Optibond FL（G1、G3、G4、G6）和 Optibond XTR（G2、G5、G7）。在 G3-G5 中，粘合剂在污染之前和之后施加，测试组 G6 和 G7 在污染后用单一粘合剂处理。复合物形成后，将样品储存在水中（7 天）并测定 μTBS。使用 Wilcoxon 检验评估数据 (p < 0.05)。

结果

对照组 G2 显示出显着高于 G1 的 μTBS。HF 污染不会导致 μTBS 显着减少。按照相同的程序，用 OptiBond XTR（G5、G7）处理的测试组的 μTBS 显着高于用 OptiBond FL（G3、G4、G6）处理的测试组。

结论

如果随后重新涂抹粘合剂，牙本质或粘合剂层的 HF 污染不会显着削弱粘合强度。