Studies on the dentin surface treatment agent with collagen-dissolving ability

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New surface treatment method for promoting the bonding of direct metal restorative materials and tooth substance without cementing agent was applied. The silver mirror reaction of ammoniacal silver nitrate solution by the use of reducing power of aldehyde group in formaldehyde enabled on the tooth surface pretreated with acid and sodium hypochlorite having collagen-dissolving ability at the room temperature and short time. As the results of metaric silver, which plates out on the tooth surface, reacts with mercurry and/or gallium as a liquid metals in the direct metal restorative materials, direct metal restorative materials were fixed tightly without cementing agent on the tooth substance. Furthermore, there is no construction gap at the interface of direct metal restorative materials and tooth substance through metallic silver on the tooth surface.