Hospital of Stomatology Affiliated to Zhejiang University School of Medicine, Zhejiang University School of Stomatology, Yan'an Road 395, Hangzhou 310006, China.
Dent Mater. 2013 Jul;29(7):e103-12. doi: 10.1016/j.dental.2013.04.009. Epub 2013 May 29.
MDP (10-methacryloyloxydecyl dihydrogenphosphate) has been proven to possess chemical bonding ability to tooth hard tissues, but its contribution to the enamel bond strength has not been recognized. The aim of this study was to investigate the contribution of chemical bonding to the short- and long-term bovine enamel micro-tensile bond strengths (μTBS).
The acid-etched enamel surfaces were treated without any primer (control) or with one of three MDP-containing primers (containing different ratio of MDP/HEMA/Bis-GMA, Kuraray Co.) for 5s, water-sprayed and air-dried. Subsequently, the pretreated enamel surfaces were applied with an etch-and-rinse adhesive Durafill Bond (Heraeus Kulzer) and placed with composite resin Durafill VS (Heraeus Kulzer). The specimens were prepared for μTBS tests after 24-h or 1-yr water storage. The etched enamel surfaces treated with or without MDP-containing primers were analyzed by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).
The acid-etched enamel treated with the MDP-primers for a very short time could produce the greater enamel μTBS than the control did (p<0.05), and change enamel micromorphology. No significant different μTBS were found between 24-h and 1-yr water storage (p>0.05). The chemical bonding of MDP on the enamel surfaces was re-confirmed by XPS.
The additional chemical bonding of MDP around the enamel crystallites of the etched enamel substrate could significantly increase the short- and long-term enamel μTBS, and their μTBS surpass those of the etch-and-rinse adhesive alone.
MDP（10-甲基丙烯酰氧癸基二氢磷酸酯）已被证明具有与牙体硬组织的化学结合能力，但它对牙釉质结合强度的贡献尚未得到认可。本研究旨在探讨化学结合对短期和长期牛牙釉质微拉伸结合强度（μTBS）的贡献。
酸蚀牙釉质表面未经任何底漆（对照）或用三种含 MDP 的底漆（含不同比例的 MDP/HEMA/Bis-GMA，Kuraray Co.）处理 5s，水喷雾和风干。随后，用酸蚀-冲洗型胶粘剂 Durafill Bond（Heraeus Kulzer）预处理牙釉质表面，并涂覆复合树脂 Durafill VS（Heraeus Kulzer）。在 24 小时或 1 年水储存后，制备用于 μTBS 测试的样本。用扫描电子显微镜（SEM）和 X 射线光电子能谱（XPS）分析用或不用含 MDP 底漆处理的酸蚀牙釉质表面。
酸蚀牙釉质用 MDP 底漆处理很短的时间可以产生比对照更高的牙釉质 μTBS（p<0.05），并改变牙釉质微观形貌。在 24 小时和 1 年水储存之间没有发现显著不同的 μTBS（p>0.05）。XPS 再次证实了 MDP 在牙釉质表面的化学结合。
在酸蚀牙釉质基质的牙釉质晶界周围增加 MDP 的化学结合，可以显著提高短期和长期牙釉质 μTBS，其 μTBS 超过单独使用酸蚀-冲洗型胶粘剂的 μTBS。
