IADR Abstract Archives
Shear-Bond-Strength Evaluation of Composite versus Glass-Inonomer-Cement Material over One Year
Objectives: The aim of the research was to evaluate the shear bond strength of Glass Ionomer Cement (GIC) to dentin versus Composite to dentin over a one-year period and tested after 24 hours, 1 week, 1month, 3 months, 6months and 12 months.
Methods: Thirty six human molars were cross-sectioned and embedded in acrylic resin. The exposed flat dentin surface was treated with Scotchbond-Universal Adhesive (3M ESPE) in the self-etching mode according to the manufacturer’s instructions. The adhesive material was light-cured for 20 seconds. The treated samples were placed in a bonding clamp and followed by fabrication of cylindrical composite rods (3 mm in height and 2.37mm in diameter) using FILTEK Supreme Ultra (3M ESPE). They were stored in groups of 6 samples at 37°C and 100% humidity. Another set of 36 embedded tooth samples were fabricated to determine the bond strength of a GIC to dentin. Ketac Universal(3M ESPE) GIC material was used to make cylindrical rods of similar dimensions as above. After conditioning the dentin surface the GIC capsules were triturated for 10 seconds, dispersed and condensed into a cylindrical mold. Samples were setting for up to 10 min with the self-cure system before they were removed from the clamp and stored the same way than the composite samples. The Ultratester(Ultradent) was used to shear off the cylinders from the samples at 1mm per min crosshead speed. Six samples per group of GIC and six samples of Composites were tested at 24 hours, 1 week, 1month, 3 months, 6 months and 12 months respectively. Student t-test at a p<0.05 confidence interval was used to analyze the data.
Results: No statistically significant difference was found when comparing the 24h bond strength of Ketac Universal GIC with 1-year GIC (p=0.246). The same no significant statistical difference was found when comparing 24 h bond strength of Filtec Supreme composite with 1-year Filtec Supreme bond strenth (p=0.364) even though the average value increased over time.
Conclusions: Composite material showed in general much higher bond strengths compared to GIC material. The one year results show higher bond strength for both materials compared to 24 h results but no statistically significant difference was found.
Methods: Thirty six human molars were cross-sectioned and embedded in acrylic resin. The exposed flat dentin surface was treated with Scotchbond-Universal Adhesive (3M ESPE) in the self-etching mode according to the manufacturer’s instructions. The adhesive material was light-cured for 20 seconds. The treated samples were placed in a bonding clamp and followed by fabrication of cylindrical composite rods (3 mm in height and 2.37mm in diameter) using FILTEK Supreme Ultra (3M ESPE). They were stored in groups of 6 samples at 37°C and 100% humidity. Another set of 36 embedded tooth samples were fabricated to determine the bond strength of a GIC to dentin. Ketac Universal(3M ESPE) GIC material was used to make cylindrical rods of similar dimensions as above. After conditioning the dentin surface the GIC capsules were triturated for 10 seconds, dispersed and condensed into a cylindrical mold. Samples were setting for up to 10 min with the self-cure system before they were removed from the clamp and stored the same way than the composite samples. The Ultratester(Ultradent) was used to shear off the cylinders from the samples at 1mm per min crosshead speed. Six samples per group of GIC and six samples of Composites were tested at 24 hours, 1 week, 1month, 3 months, 6 months and 12 months respectively. Student t-test at a p<0.05 confidence interval was used to analyze the data.
Results: No statistically significant difference was found when comparing the 24h bond strength of Ketac Universal GIC with 1-year GIC (p=0.246). The same no significant statistical difference was found when comparing 24 h bond strength of Filtec Supreme composite with 1-year Filtec Supreme bond strenth (p=0.364) even though the average value increased over time.
Conclusions: Composite material showed in general much higher bond strengths compared to GIC material. The one year results show higher bond strength for both materials compared to 24 h results but no statistically significant difference was found.
