University of Missouri-Kansas City School of Dentistry, Kansas City, MO 64108, USA.
J Dent Res. 2012 Aug;91(8):795-9. doi: 10.1177/0022034512452143. Epub 2012 Jun 26.
The effect of application mode on polymerization effectiveness of self-etch adhesives with different pHs has rarely been studied. We applied 2 self-etch adhesives-Adper Prompt L-Pop (APLP, pH ~ 0.8) and Adper Easy-Bond (AEB, pH ~ 2.5)-to dentin with or without agitation (dynamic or static application), to investigate photopolymerization efficacy on dentin, and to understand the role of chemical interaction/reaction between adhesives and dentin. Micro-Raman spectra and imaging were acquired across the dentin/adhesive (D/A) interface. The degree of conversion (DC) of each adhesive as a function of position was calculated. SEM-EDS was used to obtain the elemental distribution along the interface. Photopolymerization efficacies of the two self-etch adhesives on dentin were apparently different. APLP exhibited decreasing DCs as the distance from the D/A interface became greater for both application modes, while the DCs for the dynamic mode were much higher than those for the static mode. As for AEB, the DCs remained almost constant across the adhesive layer and showed no significant difference between two modes. Raman spectral analysis disclosed that the chemical interaction between dentin and adhesives was responsible for the observations. We also verified this by tracking the distribution of the elements Ca and P in the adhesive layers.
应用模式对不同 pH 值自酸蚀粘结剂聚合效果的影响鲜有研究。本研究采用 2 种自酸蚀粘结剂-Adper Prompt L-Pop (APLP，pH≈0.8) 和 Adper Easy-Bond (AEB，pH≈2.5)-对牙本质进行搅拌（动态或静态）或不搅拌处理，以研究粘结剂在牙本质上的光聚合效果，并了解粘结剂与牙本质之间的化学相互作用/反应的作用。在牙本质/粘结剂（D/A）界面获取微拉曼光谱和成像。计算每个粘结剂的位置相关的转化率（DC）。SEM-EDS 用于获得界面处的元素分布。两种自酸蚀粘结剂在牙本质上的光聚合效果明显不同。对于两种应用模式，APLP 的 DC 随着距离 D/A 界面的增加而降低，而动态模式的 DC 明显高于静态模式。对于 AEB，在整个粘结剂层中，DC 基本保持不变，两种模式之间没有显著差异。拉曼光谱分析表明，牙本质与粘结剂之间的化学相互作用是导致这些观察结果的原因。我们还通过追踪粘结剂层中元素 Ca 和 P 的分布来验证这一点。
