The role of MDP in a bonding resin of a two-step self-etching adhesive system

Abstract

The purpose of this study was to evaluate the role of 10-methacryloyloxydecyl dihydrogen phosphate (MDP) contained in the bonding resin of a two-step self-etch adhesive system. An experimental adhesive (M0) containing MDP only in the primer, but not in the bonding resin was prepared. Clearfil SE Bond (MM) and M0 were compared in terms of microtensile bond strength to dentin, ultimate tensile strength of the bonding resin, and dentin-resin bonding interface morphology under SEM and TEM. The immediate µTBS values of MM significantly decreased after thermal cycles while M0 were stable even after 10,000 cycles. In the SEM observations, formation of erosion was observed beneath the acid-base resistant zone only in M0. The results suggested that MDP in the bonding resin of the two-step self-etching system; 1) improved the immediate bond strength, but caused reduction in long-term bond durability; 2) offered the advantages of acid-base resistance at the ABRZ forefront area.

Effect of a functional monomer (MDP) on the enamel bond durability of single‐step self‐etch adhesives

“…Recently, some researchers have also proposed the idea of an ‘acid–base resistant zone’ (ABRZ) . Both penetration of monomers into the mineralized tooth tissue beyond the hybrid layer and the chemical interaction between functional monomers and HAp are thought to contribute to the formation of an ABRZ.…”

“…In particular, the functional monomer 10‐methacryloyldecyl dihydrogen phosphate (MDP) is considered as one of the most promising monomers for chemical bonding to HAp because the resulting MDP/HAp salts are hydrolytically stable, which contributes to the long‐term durability of the resin–tooth interface . Adhesives containing MDP have been shown to create an ‘acid–base resistant zone’ that plays key roles in preventing secondary caries, sealing restoration margins, and promoting restoration durability . Moreover, MDP interacts chemically with zirconia and accordingly several universal adhesives have recently been formulated with MDP to improve chemical bonding in multipurpose applications .…”

Effect of desensitizers on the microleakage of previously restored Class V resin composite restorations

“…[43] Besides its strong chemical affinity to calcium, it builds a particular nano-sized structure that improves bond stability. [44,45] In the present study, the bonding agent was used as a sealing material and applied onto the previously restored Class V cervical restoration without acid-etch application, using self-etch technique and showed lower microleakage scores, with no significant difference compared to other tested materials. This result can be expected due to the limited demineralization capacity of the material itself on the enamel and on the enamel-resin composite interface.…”

Influence of Etching Aggressiveness of Universal Adhesives on Longevity of Resin-Dentin Bonding Using Self-Etch Mode

“…These functional monomers can promote wetting, demineralization, and ionic binding to the mineralized tooth substrate such as 10-methacryloyldecyl-di-hydrogen-phosphate (MDP). Adhesives containing MDP have been shown to create an 'acid-base resistant zone' that plays a key role in preventing secondary caries, sealing restoration margins and promoting restoration durability (Nikaido et al 2011, Matsui et al 2015.…”