Ruse N D, Smith D C
Centre for Biomaterials, Faculty of Dentistry, University of Toronto, Ontario, Canada.
J Dent Res. 1991 Jun;70(6):1002-8. doi: 10.1177/00220345910700060101.
X-ray photo-electron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS) were used to characterize the dentin surface, to determine the effects of different pre-conditioning procedures on the elemental composition of the dentin surface, and to investigate the interaction between dentin and a dentin bonding agent (ScotchBond) by studying the changes in the elemental composition of dentin as a result of the interaction. Scanning electron microscopy (SEM) was used to characterize sample surface morphology, which was then correlated with surface elemental composition. The results showed that: (a) the elemental composition of the smear layer was similar to that of the underlying dentin; (b) cleaning with hydrogen-peroxide did not produce any modification in the elemental composition of the dentin surface; and (c) acid-etching led to an almost complete demineralization of the dentin, leaving behind an organic-rich surface. The results suggest that bonding systems that use acid-etching as a pre-conditioning procedure should be based on agents able to interact with the organic components of dentin, since bonding agents that rely on a chelation-to-calcium reaction are unlikely to be successful. The investigation of the interaction between the bonding agent and dentin led to a postulated adhesive-bonding reaction mechanism and suggested a partially cohesive failure in the bonding agent during fracturing of a dentin-bonding-agent-bonded assembly.
采用X射线光电子能谱（XPS）和二次离子质谱（SIMS）对牙本质表面进行表征，以确定不同预处理程序对牙本质表面元素组成的影响，并通过研究牙本质与牙本质粘结剂（ScotchBond）相互作用导致的牙本质元素组成变化，来研究两者之间的相互作用。使用扫描电子显微镜（SEM）对样品表面形态进行表征，然后将其与表面元素组成相关联。结果表明：（a）玷污层的元素组成与下层牙本质相似；（b）用过氧化氢清洗未对牙本质表面的元素组成产生任何改变；（c）酸蚀导致牙本质几乎完全脱矿，留下富含有机物的表面。结果表明，将酸蚀作为预处理程序的粘结系统应基于能够与牙本质有机成分相互作用的试剂，因为依赖于与钙螯合反应的粘结剂不太可能成功。对粘结剂与牙本质之间相互作用的研究得出了一种假定的粘结反应机制，并表明在牙本质-粘结剂粘结组件断裂过程中，粘结剂出现了部分内聚破坏。
