Interaction of resin-modified glass-ionomer cements with moist dentine
Copyright policy )Interaction of resin-modified glass-ionomer cements with moist dentine
The objective of this study was to report on a novel phenomenon that occurs when resin-modified glass-ionomer cements (RMGICs) are bonded to moist human dentine.Dentine surfaces from extracted third molars were abraded with 180-grit SiC paper. Ten teeth were prepared for each of the two RMGICs tested (Fuji II LC, GC Corp. and Photac-Fil Quick, 3M ESPE). RMGIC buildups were made according to the manufacturers' instructions. After storage at 37 degrees C, 100% humidity for 24 h, the bonded specimens were cut occlusogingivally into 0.9 x 0.9 mm beams. Dentine surfaces bonded with the two RMGICs were examined along the fractured RMGIC/dentine interfaces. Additional beams fractured within the RMGICS and at 3 mm away from the interfaces were used as controls. The fractured beams were examined using scanning electron microscopy (SEM), field emission-environmental SEM (FE-ESEM) and transmission electron microscopy (TEM).SEM and FE-ESEM revealed numerous solid spherical bodies along the RMGIC/dentine interfaces. By contrast, no spherical bodies could be identified within the RMGIC fractured 3 mm distant from the bonded interface. TEM and energy dispersive X-ray analyses performed on carbon-coated ultrathin sections showed that these solid spherical bodies consisted of a thin aluminum and silicon-rich periphery and an amorphous hydrocarbon core within the air voids of the original resin matrix.The spherical bodies probably represent a continuation of GI reaction and poly(HEMA) hydrogel formation that results from water diffusion from the underlying moist dentine. Their existence provides evidence for the permeation of water through RMGIC/dentine interfaces.
- University of Hong Kong (香港大學) China (People's Republic of)
- State University of Campinas Brazil
- UNIVERSIDADE DE SAO PAULO Brazil
- Georgia Regents University United States
- Universidade de São Paulo Brazil
Silicon, Surface Properties, Carbon Compounds, Inorganic, Synthetic - chemistry, Silicon - chemistry, Aluminum - chemistry, Stress, Electron, Permeability, Hydrogel, Polyethylene Glycol Dimethacrylate, Water - chemistry, Carbon Compounds, Inorganic - chemistry, Diffusion, Polyamines, Humans, Scanning, Polyhydroxyethyl Methacrylate, Microscopy, Glass Ionomer Cements - chemistry, Water movement, Silicon Compounds, Dentine, Dental Bonding, Dentin - ultrastructure, Water, Inorganic - chemistry, Hydrogel - chemistry, Interface, Polyamines - chemistry, Mechanical, 540, Carbon Compounds, Resin Cements, Resin Cements - chemistry, Microscopy, Electron, Resins, Synthetic, Glass Ionomer Cements, Dentin, Microscopy, Electron, Scanning, Polyhydroxyethyl Methacrylate - analogs & derivatives - chemistry, Resins, Synthetic - chemistry, Stress, Mechanical, Silicon Compounds - chemistry, Resins, Resin-modified glass-ionomer cement, Aluminum, Electron Probe Microanalysis
Silicon, Surface Properties, Carbon Compounds, Inorganic, Synthetic - chemistry, Silicon - chemistry, Aluminum - chemistry, Stress, Electron, Permeability, Hydrogel, Polyethylene Glycol Dimethacrylate, Water - chemistry, Carbon Compounds, Inorganic - chemistry, Diffusion, Polyamines, Humans, Scanning, Polyhydroxyethyl Methacrylate, Microscopy, Glass Ionomer Cements - chemistry, Water movement, Silicon Compounds, Dentine, Dental Bonding, Dentin - ultrastructure, Water, Inorganic - chemistry, Hydrogel - chemistry, Interface, Polyamines - chemistry, Mechanical, 540, Carbon Compounds, Resin Cements, Resin Cements - chemistry, Microscopy, Electron, Resins, Synthetic, Glass Ionomer Cements, Dentin, Microscopy, Electron, Scanning, Polyhydroxyethyl Methacrylate - analogs & derivatives - chemistry, Resins, Synthetic - chemistry, Stress, Mechanical, Silicon Compounds - chemistry, Resins, Resin-modified glass-ionomer cement, Aluminum, Electron Probe Microanalysis
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