Adsorption behavior of methacryloyloxydecyl dihydrogen phosphate on an apatite surface at neutral pH

Abstract

This study aimed to quantify the adsorption affinity of neutralized 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP-N) toward hydroxyapatite (HA) and dicalcium phosphate dihydrate (DCPD) at pH 7.0 by employing the Langmuir isotherm model. Furthermore, the effects of inorganic phosphate (Pi) and fluoride (F(-) ) ions on the adsorption of 10-MDP-N onto HA and DCPD were examined. Fixed amounts of HA and DCPD powders were suspended in different concentrations of 10-MDP-N solutions and were incubated for 18 h. Equilibrated concentrations of 10-MDP-N were measured by spectrophotometry and the adsorption affinity was estimated using the Langmuir model. Moreover, the adsorption was examined by zeta-potential analysis. The results indicated that significant Langmuir correlation was noted in both substrates, along with an increasing negative zeta-potential; however, in DCPD the correlation was less strong. The addition of 1.0 mM Pi slightly delayed the adsorption of 10-MDP-N onto both substrates, whereas 3.0 mM Pi drastically delayed adsorption onto HA but completely inhibited adsorption onto DCPD. Up to 50 ppm, F(-) enhanced the adsorption onto HA, and the adsorption plateaued at higher concentrations of F(-) , whereas no obvious influence of F(-) on the adsorption onto DCPD was noted.

Antibacterial Poly(ε-CL)/Hydroxyapatite Electrospun Fibers Reinforced by Poly(ε-CL)-b-poly(ethylene phosphoric acid)

“…We assume that PCL-b-PEPA stabilize HAp dispersion by an electrosteric mechanism, which implies chemical binding between the HAp surface and the phosphate block of PCL-b-PEPA. Note that such binding was demonstrated previously for HAp and low-M W organophosphates and organophosphonates [64,65].…”

The effect of different cleaning agents on saliva contamination for bonding performance of zirconia ceramics

“…MDP, a phosphate functional monomer, was initially developed for use as the main component of self-etching primer because it is stable on the tooth surface for a long period due to a high chemical interaction between the two. Many reports have indicated the high performance of MDP-containing adhesives to tooth substrate 14,15) , which are effective as surface treatment agents for zirconia 16) . The phosphate group, which is an adhesive functional group, binds to the hydroxyl group on the surface of zirconia oxide and is chemically adsorbed 17) .…”

Effect of fluoride mouthrinse and fluoride concentration on bonding of a one-step self-etch adhesive to bovine root dentin

“…MDP has several important roles: it etches tooth substrates, enhances monomer penetration, and interacts chemically with hydroxyapatite (12,(23)(24)(25). MDP was reported to have strong chemical bonding potential with hydroxyapatite (26)(27)(28). In addition, fluoride release from adhesive systems affected the level of dentin acid resistance at the bonding interface (5,7).…”

“…However, µTBS values were significantly lower in 9,000 ppm F specimens (P < 0.05). High NaF concentrations are believed to increase the acid resistance of dentin (28)(29)(30) and, possibly, reduce the effect of the self-etching capability of SEO. µTBS values in the 1-month groups were significantly lower than those in the immediate groups, including the control group (without fluoride treatment) (P < 0.05).…”