Recent attention has focused on the release of biologically harmful materials from resin-based restorative materials that are not thoroughly cured. Newly introduced light emitting diode (LED) curing lights may not polymerize sealants thoroughly.
Objective: To analyze the elution and measure hardness of two sealants cured by a blue LED and a quartz tungsten halogen (QTH) light.
Methods: UltraSeal XT Plus (Ultradent) and Delton FS plus (Caulk/Dentsply) were used. Disk specimens (1x10mm, n=5) of each sealant were cured with a GCe LED (GC) for 30 seconds, or an Optilux 500 light (Demetron) for 15 seconds and stored in 5 ml 30% ethanol in water at 37°C. The solution was analyzed with HP1100/Esquire3000 LC/MS (Bruker-Daltronics) at 1, 3 and 30 days. Knoop hardness was measured under the same conditions using a Buehler microhardness tester.
Results: The 3-day results are listed in the Table. The data was analyzed by repeated measure ANOVA.
Conclusion: No Bisphenol-A or BisDMA was detected. There is no significant difference between LED and Optilux lights for the release of BisGMA, UEDMA from both materials and TEGDMA from UltraSeal (p>0.05) but Delton cured with Optilux released more TEGDMA (p<0.0001). Sealants cured with LED had lower hardness than QTH (p<0.003). UltraSeal cured with Optilux had greater hardness than Delton (p<0.005).
| Concentration of Eluents | Hardness |
| Material / Light | TEGDMA (mM) | UEDMA (mM) | BisGMA (mM) | BisDMA | BPA | (KHN) |
| Delton LED | 1.357 ± 0.197 | 0.000 | 0.057 ± 0.024 | Not Detected | Not Detected | 15.78 ± 2.99 |
| UltraSeal LED | 0.585 ± 0.121 | 0.434 ± 0.089 | 0.112 ± 0.041 | 15.83 ± 0.53 |
| Delton Optilux | 2.070 ± 0.158 | 0.000 | 0.073 ± 0.009 | 16.12 ± 0.43 |
| UltraSeal Optilux | 0.533 ± 0.768 | 0.461 ± 0.096 | 0.155 ± 0.024 | 19.82 ± 2.14 |