Université Cheikh Anta DIOP, Faculté de Médecine, Pharmacie et Odontologie, Dakar, Senegal.
Oper Dent. 2010 Jan-Feb;35(1):94-104. doi: 10.2341/09-076-L.
This study evaluated mechanically and ultra-morphologically 11 different adhesive systems bonded to dentin.
The microtensile bond strength (microTBS) of 11 contemporary adhesives, including two three-step etch&rinse, three two-step etch&rinse, two two-step self-etch and four one-step self-etch adhesives to dentin, were measured. The resultant interfacial ultra-structure at dentin was characterized by transmission electron microscopy (TEM). Human third molars had their superficial dentin surface exposed, after which a standardized smear layer was produced using a medium-grit diamond bur. The selected adhesives were applied according to their respective manufacturer's instructions for microTBS measurement after storage in water at 37 degrees C for 24 hours or for TEM interfacial characterization.
The microTBS varied from 11.1 to 63.6 MPa; the highest bond strengths were obtained with the three-step etch&rinse adhesives and the lowest with one-step self-etch adhesives. TEM evaluation showed very different interaction patterns, especially for the self-etch adhesives. "Mild" self-etch adhesives demineralized the dentin surface sufficiently to provide micro-mechanical retention, while preserving hydroxyapatite within the hybrid layer to enable additional chemical interaction.
When bonded to dentin, the adhesives with simplified application procedures (in particular, one-step self-etch adhesives) still underperform as compared to conventional three-step adhesives. "Mild" two-step self-etch adhesives that provide additional chemical bonding appear to most optimally combine bonding effectiveness with a simplified application protocol.
本研究通过机械和超微形态学评估了 11 种不同的黏接剂在牙本质上的黏接性能。
本研究测量了 11 种现代黏接剂（包括两种三步酸蚀冲洗黏接剂、三种两步酸蚀冲洗黏接剂、两种两步自酸蚀黏接剂和四种一步自酸蚀黏接剂）的微拉伸黏接强度（microTBS）。使用透射电子显微镜（TEM）对牙本质的界面超微结构进行了特征描述。人类第三磨牙的表面牙本质被暴露出来，然后使用中粒度金刚石车针产生标准化的玷污层。根据各自制造商的说明，将选定的黏接剂应用于样本，在 37°C 的水中储存 24 小时后进行 microTBS 测量，或者进行 TEM 界面特征描述。
microTBS 范围为 11.1-63.6 MPa；最高的黏接强度是使用三步酸蚀冲洗黏接剂获得的，最低的是使用一步自酸蚀黏接剂获得的。TEM 评估显示出非常不同的相互作用模式，特别是对于自酸蚀黏接剂。“温和”的自酸蚀黏接剂充分地脱矿质牙本质表面，提供微机械固位，同时在混合层内保留羟磷灰石，以实现额外的化学相互作用。
与传统的三步酸蚀冲洗黏接剂相比，应用程序简化（特别是一步自酸蚀黏接剂）的黏接剂在黏接至牙本质时性能仍较差。提供额外化学黏合的“温和”两步自酸蚀黏接剂似乎最优化地将黏接效果与简化的应用程序结合起来。
