all-bond-2 and triethylene-glycol-dimethacrylate

Etching is necessary to expose the fibers and enable both mechanical and chemical bonding of the resin core to the fiber post. This study evaluated the effect of concentration and application time of hydrogen peroxide on the surface topography and bond strength of glass fiber posts to resin cores.. Fiber posts were etched with 24% or 50% hydrogen peroxide for 1, 5, or 10 min (n = 10). Posts without any treatment were used as a control. After etching, the posts were silanated and adhesive resin was applied. The posts were positioned into a mold to allow a self-cured resin core to be inserted. The post/resin assembly was serially sectioned into five beams that were subjected to a tensile bond strength test. Data were subjected to two-way ANOVA and Tukey test (α = 0.05). The surface topography was analyzed using scanning electronic microscopy.. Non-etched post presents a relatively smooth surface without fiber exposure. Application of hydrogen peroxide increased the surface roughness and exposed the fibers. All experimental conditions yielded similar bond strength values that were higher than those obtained in the control group.. Both 24% and 50% hydrogen peroxide exposure increased the bond strength of resin to the posts, irrespective of the application time.

Topics: Bisphenol A-Glycidyl Methacrylate; Composite Resins; Dental Bonding; Dental Etching; Epoxy Resins; Glass; Humans; Hydrogen Peroxide; Materials Testing; Methacrylates; Microscopy, Electron, Scanning; Oxidants; Polyethylene Glycols; Polymethacrylic Acids; Post and Core Technique; Quartz; Resin Cements; Silanes; Stress, Mechanical; Surface Properties; Tensile Strength; Time Factors

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