IADR Abstract Archives
Ion release from GIC and RMGIC restorations with SDF conditioning
Objectives: To assess the fluoride and silver ion release of glass ionomer cement (GIC) and resin-modified glass ionomer cement (RMGIC) restorations after conditioning with 38% silver diamine fluoride (SDF).
Methods: 40 dentine blocks with a cavity of 2*2*2 mm were prepared. The dentine blocks were restored with either GIC or RMGIC and half of each type were applied with 38% SDF forming 4 groups: Group 1 - GIC + SDF, Group 2-GIC; Group 3-RMGIC+ SDF; Group 4- RMGIC. The blocks were immersed in 5 mL of deionized water individually and stored at 37 °C for 2 years. Fluoride and silver ion concentration in storage solutions were measured regularly using an ion analyzer and ion chromatography, respectively. The restored dentine blocks were then sectioned and the cross-sectional surfaces were assessed by scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDS) after 1 week and 2 years, respectively.
Results: The mean and standard deviation of accumulative fluoride releasing in Groups 1-4 for 2 years were 25.53±0.98 mg/L, 18.99±1.31 mg/L, 20.50±1.41 mg/L and 9.41±0.39 mg/L respectively (Groups 1> 3&2> 4, p<0.05). The mean and standard deviation of accumulative silver releasing in Groups 1-4 for 2 years were 6.54±1.81 mg/L, 0.00±0.00 mg/L, 2.86±0.64 mg/L and 0.00±0.00 mg/L respectively (Groups 1> 3> 2&4, p<0.05). The GIC and RMGIC restorations with SDF conditioning showed significantly higher fluoride and silver releasing compared to restorations without SDF conditioning (p<0.05). SEM images of the cross-sectional view of the dentine blocks showed silver crystals within dentinal tubules 1 weeks and 2-years after restoration. EDS analysis found silver penetration depth in dentine in Groups 1 and 3 were around 255um in 1 weeks and 300um after 2 years.
Conclusions: The 38% silver diamine fluoride conditioning increased the fluoride and silver release of GIC and RMGIC restorations.
Methods: 40 dentine blocks with a cavity of 2*2*2 mm were prepared. The dentine blocks were restored with either GIC or RMGIC and half of each type were applied with 38% SDF forming 4 groups: Group 1 - GIC + SDF, Group 2-GIC; Group 3-RMGIC+ SDF; Group 4- RMGIC. The blocks were immersed in 5 mL of deionized water individually and stored at 37 °C for 2 years. Fluoride and silver ion concentration in storage solutions were measured regularly using an ion analyzer and ion chromatography, respectively. The restored dentine blocks were then sectioned and the cross-sectional surfaces were assessed by scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDS) after 1 week and 2 years, respectively.
Results: The mean and standard deviation of accumulative fluoride releasing in Groups 1-4 for 2 years were 25.53±0.98 mg/L, 18.99±1.31 mg/L, 20.50±1.41 mg/L and 9.41±0.39 mg/L respectively (Groups 1> 3&2> 4, p<0.05). The mean and standard deviation of accumulative silver releasing in Groups 1-4 for 2 years were 6.54±1.81 mg/L, 0.00±0.00 mg/L, 2.86±0.64 mg/L and 0.00±0.00 mg/L respectively (Groups 1> 3> 2&4, p<0.05). The GIC and RMGIC restorations with SDF conditioning showed significantly higher fluoride and silver releasing compared to restorations without SDF conditioning (p<0.05). SEM images of the cross-sectional view of the dentine blocks showed silver crystals within dentinal tubules 1 weeks and 2-years after restoration. EDS analysis found silver penetration depth in dentine in Groups 1 and 3 were around 255um in 1 weeks and 300um after 2 years.
Conclusions: The 38% silver diamine fluoride conditioning increased the fluoride and silver release of GIC and RMGIC restorations.