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

Abstract

The present study aimed to determine the effect of the functional monomer, 10-methacryloxydecyl dihydrogen phosphate (MDP), on the enamel bond durability of single-step self-etch adhesives through integrating fatigue testing and long-term water storage. An MDP-containing self-etch adhesive, Clearfil Bond SE ONE (SE), and an experimental adhesive, MDP-free (MF), which comprised the same ingredients as SE apart from MDP, were used. Shear bond strength (SBS) and shear fatigue strength (SFS) were measured with or without phosphoric acid pre-etching. The specimens were stored in distilled water for 24 h, 6 months, or 1 yr. Although similar SBS and SFS values were obtained for SE with pre-etching and for MF after 24 h of storage in distilled water, SE with pre-etching showed higher SBS and SFS values than MF after storage in water for 6 months or 1 yr. Regardless of the pre-etching procedure, SE showed higher SBS and SFS values after 6 months of storage in distilled water than after 24 h or 1 yr. To conclude, MDP might play an important role in enhancing not only bond strength but also bond durability with respect to repeated subcritical loading after long-term water storage.

Mini-interfacial fracture toughness as a new validated enamel-bonding effectiveness test

“…Bond-strength testing comparing MDP-free with MDPcontaining adhesives showed nevertheless that chemical interaction of MDP with HAp, while perhaps less relevant at short time, is crucial in maintaining interfacial stability over time. Very recent research confirmed this even in case an E&R approach is employed (Tsuchiya et al, 2016).…”

Influence of different pre‐etching times on fatigue strength of self‐etch adhesives to dentin

“…Specimens were made and stored as described above for SBS testing, and 30 specimens were used for each test condition. The staircase method of fatigue testing reported by Draughn was used for SFS testing, as previously reported . The initial maximum load for SFS testing was set to 50–60% of the SBS determined for that adhesive system, and the minimum load was maintained closed to zero (0.4 N).…”

The effect of Er:YAG laser irradiation on the bond stability of self-etch adhesives at different dentin depths

“…It has been asserted that the quality of chemical bonding with MDP monomer might be time-dependent. Bonding agents containing MDP have been proven to form nanolayering structures that appear very stable according to their low dissolution rate in water [22]. …”