Depth of cure evaluation of four different light-activated composites using different curing modes

A. Razooki Al- Shekhli, Ali

	Depth of cure evaluation of four different light-activated composites using different curing modes
Journal of baghdad college of dentistry
Article 1, Volume 21, Issue 1, 2009, Pages 5-8
Author
Ali A. Razooki Al- Shekhli
Abstract
ABSTRACTBackground: As light passes through the bulk of the composite material, the light intensity is greatly reduced due tolight absorption and scattering by resin composites, thus, decreasing the effectiveness of cure through the depth ofthe composite layer. This study investigated the influence of different new curing modes (conventional andexperimental) and composite formulations on depth of cure using the ISO scraping test.Materials and methods: This study investigated the depth of cure (ISO scraping method) of four conventionalcomposites after exposure to different curing modes. A two-piece aluminum mold with a diameter of 4mm and aheight of 8mm was used as a mold for the composite specimens.VIP light curing unit was used to deliver all thecuring modes for photo-curing of all the composite specimens in this study. 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 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). Theheight of the cylinder of cured material was measured with a micrometer to an accuracy of 0.01 mm. This value wasdivided by two (in compliance with ISO CD4049: 2000), and recorded as the depth of cure in mm for that specificspecimen.Results: Statistical analysis of the data by using the one-way analysis of variance revealed that, there is statisticallyvery highly significant difference for all the depth of cures between the curing modes and composite types.Conclusion: This study indicated that, although, both curing mode and composite type significantly affect depth ofcure but the effect of composite composition on the depth of cure is more predominant than that of curing mode.Key words: Resin composite, light curing modes, composite depth of cure. J Bagh Coll Dentistry 2009; 21(1):5-8)

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