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Post-gel polymerization shrinkage strain of four different light-activated composites polymerized with different curing modes | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 19, Issue 1, 2007, Pages 38-41 | ||
| Authors | ||
| Haitham J. Al-Azzawi; Ali A. Al- Shekhli | ||
| Abstract | ||
| ABSTRACTBackground: This study investigated the influence of different new curing modes on the post-gel polymerization shrinkage strain of different light- activated composites.Materials and methods: This study investigated the Post-Gel Polymerization Shrinkage Strain of two mm thick composite specimens after exposure to different curing modes. Parameters included six 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 three experimental curing modes of higher energy density: Prolonged low-intensity pulse cure mode (PLPC), Prolonged moderate-intensity pulse cure mode (PMPC) and Rapid high-intensity continues cure mode (RHCC) for each of the four 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 is statistically very highly significant difference for all the polymerization shrinkage strains with the composite type, curing mode and post-curing-time.Conclusion: Light intensity reduction and elongation of the curing time combined with pulse activation and soft start polymerization (PLPC curing mode) resulted in significantly lower and gradual post-gel polymerization shrinkage strain for all the light-activated composites being testedKey words: Post-gel polymerization, curing modes, polymerization shrinkage. (J Bagh Coll Dentistry 2007; 19(1) 38-41) | ||
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