Influence of surface energy parameters of dental self-adhesive resin cements on bond strength to dentin

Abstract

The purpose of this study was to determine the surface energy parameters of dental self-adhesive resin cements (SRCs) and to measure their bond strength to dentin. Six dental SRCs (RelyX Unicem Clicker, RU; Maxcem Elite, ME; BisCem, BC; Clearfil SA Luting, SA; Multilink Speed, MS; seT PP, SP) and one resin-modified glass ionomer cement (RelyX Luting 2, RL; control) were tested. Smear layer-covered bovine dentin was used as bonding substrate. Using the dynamic sessile drop method, surface energy, surface energy components, degree of hydrophobicity/hydrophilicity (expressed as ΔG sws using thermodynamic notation), and apparent surface energies for each material were calculated. The luting cements were bonded to the dentin and stored in water at 37°C for 24 h prior to shear bond strength test (n = 10). Pearson correlation analysis was applied to detect possible correlations between surface energy parameters and measured shear bond strength (α = 0.05). RU, SA, and MS produced negative ΔG sws values (hydrophobic), whereas ME, BC, SP, and RL yielded positive ones (hydrophilic). RU had the highest value among all six SRCs tested, the value for MS being statistically equivalent (p = 0.785). The base component, ΔG sws , and surface energy determined with water showed significant negative linear correlations with dentin bond strength (r/p = À0.801/0.030, À0.900/0.006, and À0.892/0.007, respectively). These results suggest that bonding to smear layer-covered bovine dentin was governed by the base component and the hydrophobicity/hydrophilicity of the SRCs.

Do Irrigation Solutions Influence the Bond Interface Between Glass Fiber Posts and Dentin?

“…Furthermore, the decreased hydrophilicity of the RelyX U200 resin cement as compared to the Maxcem Elite resin (MCE group) seemed to result in more favorable bonding results. This suggests that hydrophilic components deteriorate the bond strength, and result in higher water absorption (19). In addition, the Scotchbond TM Universal adhesive used in the SBU group has an acidic pH which is able to partially demineralize dentin, leaving a significant number of hydroxyapatite crystals surrounding the collagen fibrils (22).…”

“…The last 3 min were used to calculate the interface permeability for each experimental condition. The displacement in mm was measured and converted into μL/min (19).…”

Influence of Curing Mode on the Surface Energy and Sorption/Solubility of Dental Self-Adhesive Resin Cements

“…The total surface energy γ s was derived by the equation [7,14]: γ s = γ s LW + γ s AB = γ s LW + 2( γ s + γ s − ) 1/2 , where γ s AB is the acid/base component.…”

Surface energy of bovine dentin and enamel by means of inverse gas chromatography

“…Adhesion is defined as an attraction between atoms and molecules at the contacting surfaces of different materials by several mechanical and physical processes and intermolecular forces [2,6,8]. The value of the work of adhesion depends on the surface energy of both connected materials [9][10][11][12]. Depending on the prevailing type of component of surface energy (dispersive or polar) the bonded surfaces will connect with dispersive interactions or acid-base interactions.…”

“…There are several methods of estimation of the solid surface energy. The most popular indirect method is contact angle measurement [10][11][12][13][14][15][16]. The use of different polar and apolar liquids enables determination of Lifshitz-van der Waals (γ s LW ) and acid-base (Lewis) (γ s ab ) components of solid surface free energy (γ s ).…”