Abstract
The aim of this study was to assess the shear bond strength of four acetone-based one-bottle adhesive systems to enamel and dentin, and compare to that of an ethanol-based system used as control. Fifty human molars were bisected mesiodistally and the buccal and lingual surfaces were embedded in acrylic resin using PVC cylinders. The buccal surfaces were ground to obtain flat dentin surfaces, while the lingual surfaces were ground to obtain flat enamel surfaces. All specimens were polished up to 600-grit sandpapers and randomly assigned to 5 groups (n=20; 10 dentin specimens and 10 enamel specimens), according to the adhesive system used: One-Step (Bisco); Gluma One Bond (Heraeus Kulzer); Solobond M (Voco); TenureQuik w/F (Den-Mat) and OptiBond Solo Plus (Kerr) (control). Each adhesive system was applied according to the manufacturers' instructions. The respective proprietary hybrid composite was applied in a gelatin capsule (d=4.3 mm) and light-cured for 40 s. The specimens were tested in shear strength with an Instron machine at a crosshead speed of 5 mm/min. Bond strengths means were analyzed statistically by one-way ANOVA and Duncan's post-hoc (p< or =0.05). Shear bond strength means (MPa) (+/-SD) to enamel and dentin were: Enamel: One-Step=11.3(+/-4.9); Gluma One Bond=16.3(+/-10.1); Solobond M=18.9(+/-4.5); TenureQuik w/F=18.7(+/-4.5) and OptiBond Solo Plus=16.4(+/-3.9); Dentin: One-Step=6.4(+/-2.8); Gluma One Bond=3.0(+/-3.4); Solobond M=10.6(+/-4.9); TenureQuik w/F=7.8(+/-3.9) and OptiBond Solo Plus=15.1(+/-8.9). In enamel, the adhesive systems had statistically similar bond strengths to each other (p>0.05). However, the ethanol-based system (OptiBond Solo Plus) showed significantly higher bond strength to dentin than the acetone-based systems (p< or =0.0001). In conclusion, the solvent type (acetone or ethanol) had no influence on enamel bond strength, but had great influence on dentin bonding, which should be taken into account when choosing the adhesive system.
Highlights
Bonding to enamel can be satisfactorily achieved using the acid-etching technique [1]
Shear bond strength means to dentin ranged from 3.0±3.4 MPa for Gluma One Bond to 15.1±8.9 MPa for OptiBond Solo Plus
Total-etch one-bottle adhesive systems combine the functions of primer and bonding agent in the same solution
Summary
Bonding to enamel can be satisfactorily achieved using the acid-etching technique [1]. Dentin bonding requires removal or modification of the smear layer and superficial demineralization by acid etching [2]. Chemical reactions between adhesive systems and dentin have been reported, it is generally accepted that dentin bonding relies primarily on micromechanical interaction similar that of enamel bonding, mediated by the permeation of resin monomers into acid-etched dentin [3]. The entanglement of the polymerized adhesive resin with collagen fibrils and residual hydroxyapatite crystals generates an interfacial structure called “resin-dentin interdiffusion zone” or “hybrid layer” [3]. Dentin adhesive systems contain high-vapor pressure organic solvents (acetone and ethanol). These chemical agents, known as “water-chases”, increase dentin wettability and help replace the water on the acidetched and rinsed dentin surface with hydrophilic resin monomers [4]
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