J Adhes Dent. 2018;20(3):243-247. doi: 10.3290/j.jad.a40631.
To examine the influence of phosphoric acid containing chlorhexidine on the dentin bond stability of a universal and a 2-step etch-and-rinse adhesive.
Eighty sound bovine incisors were randomly assigned to 8 groups (n = 10) according to: phosphoric acid (37% phosphoric acid [CTR] or 37% phosphoric acid with 2% chlorhexidine [CHX]); adhesive (Scotchbond Universal Adhesive [SBU]or Adper Single Bond 2 [SB2]); and water storage time (24 h and 6 months). Both acids and adhesives were applied to flat dentin surfaces (following manufacturer's instructions) upon which composite cylinders were built up (0.72 mm2). After storage in distilled water at 37°C for 24 h or 6 months, the composite cylinders were submitted to microshear bond strength (µSBS) testing. Bond strength data (MPa) were analyzed using three-way ANOVA and post-hoc Tukey's test (α = 5%).
The interaction among factors was significant (p = 0.012). Both adhesives showed similar 24-h bond strengths regardless of the phosphoric acid. After 6 months, similar values were found for both materials when control phosphoric acid was used, but CHX phosphoric acid produced statistically significantly lower bond strengths for SBU. SB2 bond strength was not affected by acid type.
Phosphoric acid containing chlorhexidine induced premature bond strength degradation of Scotchbond Universal Adhesive.
研究含氯己定磷酸对通用型和两步酸蚀-冲洗型黏接剂牙本质黏结稳定性的影响。
将 80 颗健康的牛切牙随机分为 8 组（n=10），根据以下因素进行分组：酸蚀剂（37%磷酸[对照组（CTR）]或 37%磷酸加 2%氯己定[CHX]）；黏接剂（Scotchbond Universal Adhesive[SBU]或 Adper Single Bond 2[SB2]）；和水储存时间（24 h 和 6 个月）。两种酸和黏接剂均按照说明书应用于平整牙本质表面，随后在其上堆积复合圆柱体（0.72 mm2）。在 37°C 的蒸馏水中储存 24 h 或 6 个月后，将复合圆柱体进行微剪切黏结强度（µSBS）测试。使用三因素方差分析和事后 Tukey 检验（α=5%）分析黏结强度数据（MPa）。
各因素间存在交互作用（p=0.012）。无论使用哪种磷酸，两种黏接剂在 24 h 时的黏结强度均相似。6 个月后，当使用对照磷酸时，两种材料的黏接强度相似，但 CHX 磷酸会显著降低 SBU 的黏结强度。SB2 黏接强度不受酸类型的影响。
含氯己定的磷酸会导致 Scotchbond Universal Adhesive 的黏结强度过早下降。
