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Post-gel polymerization shrinkage strain evaluation of four light-activated composites using different curing modes | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 21, Issue 2, 2009, Pages 14-17 | ||
| Author | ||
| Ali A. Razooki Al- Shekhli | ||
| Abstract | ||
| ABSTRACTBackground: One of the ways of minimizing polymerization shrinkage of light-activated composites is by applyingshort pulses of light energy, prepolymerization at low light intensity followed by final cure at high intensity (soft-startpolymerization) or a combination of both. This study investigated the influence of different curing modes on the postgelpolymerization shrinkage strain of different light- activated composites.Materials and methods: This study investigated the Post-Gel Polymerization Shrinkage Strain of two mm thickcomposite specimens after exposure to different curing modes. Parameters included six conventional curing modes:Control (C), Pulse Delay I (PDI), Pulse Delay II (PDII), Soft-start (SS), Pulse Cure I (PCI), and Pulse Cure II (PCII) plus threeexperimental curing modes of higher energy density: Prolonged low-intensity pulse cure mode (PLPC), Prolongedmoderate-intensity pulse cure mode (PMPC) and Rapid high-intensity continues cure mode (RHCC) for each of thefour different light-activated composite materials (Tetric Ceram, Heliomolar, Herculite XRV and Degufill Mineral).Results: Statistical analysis of the data by using the one-way analysis of variance revealed that, there was astatistically significant difference for all the polymerization shrinkage strains with the composite type, curing modeand post-curing-time.Conclusion: Light intensity reduction and elongation of the curing time combined with pulse activation and soft startpolymerization (PLPC curing mode) resulted in significantly lower and gradual post-gel polymerization shrinkage strainfor all the light-activated composites being testedKey words: Post-gel polymerization, Light curing modes, Polymerization Shrinkage strain. J Bagh Coll Dentistry 2009;21(2):14-17) | ||
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