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Title: Post-gel shrinkage with different modes of LED and halogen light curing units
Authors: Soh, M.S.
Yap, A.U.J. 
Siow, K.S. 
Issue Date: May-2004
Citation: Soh, M.S.,Yap, A.U.J.,Siow, K.S. (2004-05). Post-gel shrinkage with different modes of LED and halogen light curing units. Operative Dentistry 29 (3) : 317-324. ScholarBank@NUS Repository.
Abstract: This study compared the post-gel shrinkage of two LED (light-emitting diodes) lights (Elipar FreeLight [FL], 3M ESPE; GC e-Light [EL], GC), a high intensity (Elipar TriLight [TL], 3M ESPE) and a very high intensity (Astralis 10 [AS], Ivoclar Vivadent) halogen light to a conventional (Max [MX] (control), Dentsply-Caulk) halogen light. Ten light curing regimens were investigated. These included continuous (FL1, EL2, MX, TL1 and AS1), soft-start (FL2, EL4, TL2), pulse activation (EL1) and turbo (EL3) modes. A strain-monitoring device and test configuration was used to measure the linear polymerization shrinkage of a composite restorative (Z100, [3M ESPE]) during and post-light polymerization up to 60 minutes when cured with the different modes. Five specimens were made for each cure mode. Results were analyzed using ANOVA/Scheffe's post-hoc test and independent sample t-tests at significance level 0.05. Shrinkage associated with the various modes of EL was significantly lower than MX immediately after light polymerization and at one-minute post-light polymerization. No significant difference between MX and the various lights/cure modes was observed at 10, 30 and 60-minutes post-light polymerization. At all time intervals, post-gel shrinkage associated with continuous light curing mode was significantly higher than the soft-start light curing mode for FL and TL.
Source Title: Operative Dentistry
ISSN: 03617734
Appears in Collections:Staff Publications

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