Comprehensive analysis of functional monomer in dental adhesives using molecular-level analysis technique and investigation of the most suitable composition of adhesives

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It was reported that 10-MDP promoted formation of self-assembled layering at resin- hydroxyapatite interface when it was applied. Firstly, this study showed that the commercial 10-MDP based adhesives also formed the self-assembled layering of two 10-MDP molecules, joined by stable MDP-Ca salt formation, at the interface between human dentin and resin as similar to 10-MDP solution. The three-dimensional observation with FIB-SEM revealed that MDP-Ca salt was formed at the interface, extending into the adhesive (resin) layer. When we prepared adhesives containing MDP-Ca salts as a model of adhesion layer and measured its properties, polymerization shrinkage decreased and some of properties increased by adding the salt. It is concluded that MDP-containing adhesives do form nano-layering at the adhesive interface and MDP-Ca salt spread through the adhesive layer. The properties of adhesive layer with resin, salts and other residual tooth substances may influence the adhesion.