sodium-hypochlorite and methacryloyloxydecyl-dihydrogen-phosphate

To investigate the effects of two functional monomers on caries-inhibition potential and bond strength of two-step self-etching adhesive systems to enamel.. Clearfil SE Bond and similar experimental formulations different in the functional monomer were used. Four combinations of primer and bonding agents were evaluated: (1) Clearfil SE Bond which contains MDP in both primer and bonding (M-M); (2) Clearfil SE Bond primer and Phenyl-P in bonding (M-P); (3) Phenyl-P in primer and Clearfil SE Bond bonding (P-M); (4) Phenyl-P in primer and bonding (P-P). Ground buccal enamel surfaces of human sound premolars were treated with one of the systems and the bonded interface was exposed to an artificial demineralising solution (pH 4.5) for 4.5 h, and then 5% NaOCl with ultrasonication for 30 min. After argon-ion etching, the interfacial ultrastructure was observed using SEM. Micro-shear bond strength to enamel was measured for all groups and results were analysed using one-way ANOVA and Turkey's HSD, while failure modes were analysed by chi-square test.. An acid-base resistant zone (ABRZ) was found with all adhesive systems containing MDP either in primer or bond; however, ultramorphology and crystallite arrangement in the ABRZ were different among groups. P-P was the only group devoid of this protective zone. Micro-shear bond strength in M-M was significantly higher than those in M-P, P-M and P-P, while the latter three were not different from each other. Failure modes were significantly different (p<0.05).. Functional monomers in two-step self-etching systems influence both the bonding performance and the formation of ABRZ on enamel.

Topics: Acetic Acid; Adhesiveness; Alkalies; Boron Compounds; Composite Resins; Crystallography; Dental Bonding; Dental Enamel; Dental Etching; Humans; Hydrogen-Ion Concentration; Materials Testing; Methacrylates; Methylmethacrylates; Microscopy, Electron, Scanning; Organophosphorus Compounds; Resin Cements; Shear Strength; Sodium Hypochlorite; Stress, Mechanical; Surface Properties; Temperature; Time Factors; Tooth Demineralization; Ultrasonics; Water

This study aimed to investigate the effect of fluoride concentration in adhesives on morphology of acid-base resistant zone (ABRZ). Seven experimental adhesives with different concentrations of NaF (0 wt%; F0 to 100 wt%: F100) were prepared based on the formulation of a commercially available adhesive (Clearfil Protect Bond, F100). The resin-dentin interface of the bonded specimen was subjected to demineralizing solution and NaOCl, sectioned, polished and argon-ion etched for SEM observation. Fluoride release from each adhesive was measured using an ion-selective electrode. Fluoride ion release from the adhesive linearly increased with higher NaF concentration. The ABRZ area increased significantly with higher NaF concentration except for F0, F10, and F20 (p<0.05). F100 showed the largest ABRZ, where a slope of acid-resistant dentin was clearly observed at the bottom of the ABRZ. The concentration of NaF in the two-step self-etching adhesive resin influenced the amount of dentin structure remaining after acid-challenge.

Topics: Acids; Bisphenol A-Glycidyl Methacrylate; Boron Compounds; Cariostatic Agents; Composite Resins; Crystallography; Dental Bonding; Dentin; Dentin-Bonding Agents; Diffusion; Humans; Ion-Selective Electrodes; Materials Testing; Methacrylates; Methylmethacrylates; Microscopy, Electron, Scanning; Sodium Fluoride; Sodium Hypochlorite; Temperature; Time Factors; Tooth Demineralization; Water

This study aimed at evaluating the effect of functional monomers in all-in-one adhesive systems on formation of acid-base resistant zone (ABRZ) in enamel and dentin. Experimental adhesive systems containing one of three functional monomers; MDP, 3D-SR and 4-META were applied to enamel or dentin surface and light-cured. A universal resin composite was then placed. The specimens were subjected to a demineralizing solution (pH 4.5) and 5% NaClO for acid-base challenge and then observed by SEM. The ABRZ was clearly observed in both enamel and dentin interfaces. However, enamel ABRZ was thinner than dentin ABRZ in all adhesives. Morphology of the ABRZ was different between enamel and dentin, and also among the adhesives. Funnel-shaped erosion was observed only in the enamel specimen with the 4-META adhesive. The formation of enamel/dentin ABRZ was confirmed in all adhesives, but the morphology was influenced by the functional monomers.

Topics: Acetic Acid; Bisphenol A-Glycidyl Methacrylate; Boron Compounds; Calcium Chloride; Composite Resins; Dental Enamel; Dental Materials; Dentin; Humans; Hydrogen-Ion Concentration; Methacrylates; Methylmethacrylates; Microscopy, Electron, Scanning; Phosphates; Polyethylene Glycols; Polymethacrylic Acids; Resin Cements; Sodium Hypochlorite; Temperature; Time Factors; Tooth Demineralization; Tooth Erosion; Water