all-bond-2 and hydroxyethyl-methacrylate

The study evaluates the behavior of different adhesive systems and resin cements in fiber post placement, with the intent to clarify the possible role of unfilled resin as a luting material for fiber posts.. Two luting agents (Dual-Link and Unfilled Resin) for cementing fiber posts into root canals were applied either with All-Bond 2 or One-Step Plus, or without an adhesive system, and challenged with the push-out test. Slices of roots restored with posts were loaded until post segment extrusion in the apical-coronal direction. Failure modes were analyzed under SEM.. Push-out strength was significantly influenced by the luting agent (p < 0.05), but not by the bonding strategy (p > 0.05). The best results were obtained in combination with Unfilled Resin with One-Step Plus. Dual-Link groups failed mainly cohesively within the cement, while Unfilled Resin demonstrated more adhesive fracture at the post interface.. The results of this study support the hypothesis that adhesive unfilled resin application is essential for achieving high bond strength to radicular dentin.

Topics: Acid Etching, Dental; Adolescent; Bisphenol A-Glycidyl Methacrylate; Cementation; Dental Bonding; Dental Pulp Cavity; Dentin; Dentin-Bonding Agents; Humans; Humidity; Materials Testing; Methacrylates; Microscopy, Electron, Scanning; Polyethylene Glycols; Polymethacrylic Acids; Polyurethanes; Post and Core Technique; Resin Cements; Root Canal Preparation; Stress, Mechanical; Temperature; Time Factors

The purpose of this study was to analyse the composition of representative dentin primers and bonding agents, and to investigate the relationship between chromatographic retention times and partition coefficient (log P) values.. Dentin bonding systems (DBS) were analysed with reversed phase high-performance liquid chromatography (HPLC). The log P values were obtained computationally with the advanced chemistry development software.. The DBS were analysed and the monomers were identified. The log P values were calculated and the relationship between log P and retention times for the monomers was described by the equation: log P = 2.436R(t) - 3.636, with a correlation value (r) of r = 0.9095.. The components of the DBS were successfully resolved and identified, thus illustrating the analytical power of HPLC regarding those systems. Also the log P values correlated with the retention times of monomers. Thus, they can be used as a prediction tool in future analysis. These findings are important for a mechanistic understanding of Primer and Adhesive actions in the bonding to the dentin.

Topics: Algorithms; Bisphenol A-Glycidyl Methacrylate; Boron Compounds; Chromatography, High Pressure Liquid; Composite Resins; Dentin-Bonding Agents; Forecasting; Humans; Maleates; Methacrylates; Methylmethacrylate; Methylmethacrylates; Polyethylene Glycols; Polymethacrylic Acids; Polyurethanes; Resin Cements; Software

Dentin cavities, prepared in extracted human teeth, were treated with various proprietary dentin-bonding agents and then filled with a light-cured restorative resin for posterior use. All bonding agents were either treated in accordance with the manufacturers' instructions or combined with Gluma, which is an aqueous solution of glutaraldehyde and HEMA, a hydrophilic monomer. 10 min after polymerization, the width and the extent of the marginal contraction gap was measured approximately 0.1 mm below the free surface of the filling, using a light microscope. With nearly all dentin-bonding agents, the marginal contraction gap could be significantly reduced if Gluma was used after conditioning of the dentin. The reason for this improvement may be that glutaraldehyde cross-links the collagen fibers and thereby strengthens the organic part of the hybrid layer, however, other mechanisms might also play a rôle in the improvement found.

Topics: Acrylic Resins; Aluminum Silicates; Bisphenol A-Glycidyl Methacrylate; Chemical Phenomena; Chemistry, Physical; Collagen; Composite Resins; Cross-Linking Reagents; Dental Bonding; Dental Marginal Adaptation; Dentin; Dentin-Bonding Agents; Glutaral; Humans; Methacrylates; Polymers; Polymethacrylic Acids; Resin Cements; Resins, Synthetic; Silicon Dioxide; Surface Properties; Zirconium

To determine whether the use of two HEMA-containing dentin desensitizing agents [Health-Dent Desensitizer with fluoride (H) or Gluma Desensitizer (G)], when applied at simulated "cavity preparation" and "cementation" appointments, affects the bond strength of lab processed resin composite restorations cemented to dentin.. The occlusal surfaces of 70 teeth were ground flat to expose dentin and polished to 600 grit. Teeth were randomly assigned to seven groups (n = 10). The treatments were applied in two sessions in order to simulate cavity preparation and cementation appointments. Water (W) was applied as a control instead of a desensitizing agent. H or G were applied for 30 seconds with a rubbing motion (1) at preparation appointment (HW and GW), or (2) at cementation appointment, after etching (WH and WG), or (3) at both sessions (HH and GG). In the control group, water was applied at both sessions (WW). All-Bond 2 and Dual Cement were used according to manufacturers' instructions to cement pre-polymerized resin composite cylinders (4 mm diameter) to the dentin surfaces using a force of 1.0 MPa. Specimens were thermocycled 300x and tested in shear until failure. Data was analyzed using one-way ANOVA and Tukey's HSD test at alpha = 0.05.. Mean bond strength and standard deviations are reported in MPa: GW = 7.4 +/- 6.0; WW = 7.7 +/- 5.8; HW = 8.2 +/- 4.3; WH = 10.8 +/- 6.2; GG = 13.5 +/- 6.0; HH = 13.8 +/- 7.1; WG = 19.9 +/- 8.8. There were no significant differences in bond strengths for GW, WW, HW, WH and GG. Shear bond strength for WG and HH was significantly higher than all groups except for GG. Results of this in vitro study indicate that the use of desensitizers at the preparation and/or cementation appointment does not interfere with bond strengths of resin cement to dentin.

Topics: Analysis of Variance; Benzalkonium Compounds; Dental Bonding; Dental Cements; Dentin Sensitivity; Dentin-Bonding Agents; Evaluation Studies as Topic; Glutaral; Humans; Materials Testing; Mechanics; Methacrylates; Polymethacrylic Acids; Resin Cements; Tensile Strength