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Effectiveness of cure evaluation of four light-activated composites using different curing modes | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 22, Issue 1, 2010, Pages 7-10 | ||
| Author | ||
| Ali A. R. Al- Shekhli | ||
| Abstract | ||
| ABSTRACTBackground: The degree of polymerization of resin composites generally decreases from the surface of therestoration inwardly. Ideally, the degree of polymerization of the composite should be the same throughout its depthand the hardness ratio should be very close or equal to one and can be considered a good indicator for optimalcomposite polymerization. This study investigated the influence of different new curing modes on the effectiveness ofcure of conventional light- activated composites to examine their efficacy in satisfying composite adequatepolymerization (hardness ratio ≥ 0.8).Materials and methods: This study investigated the hardness of the top/bottom surfaces and hardness ratio of twomm thick composite specimens after exposure to different curing modes. Parameters included six conventionalcuring 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 composites being tested (Tetric Ceram, Heliomolar, HerculiteXRV and Degufill Mineral).Results: Results revealed that, there was a statistically significant difference for all the hardness ratios with the curingmodes except the hardness ratio of Heliomolar composite where, there was an insignificant difference because, themean hardness ratio of Heliomolar composite with the first six curing modes (control, PDI, PDII, SS, PCI, PCII) was notcalculated because of poor polymerization of Heliomolar bottom surfaces with these six curing modes.Conclusion: This study concluded that, conventional curing modes had failed to cure Heliomolar and Degufill Mineralcomposites adequately while the experimental curing modes of high energy density (PLPL, PMPC and RHCC) hadsatisfied effectiveness of composite cure for all the composites being tested.Key words: resin composite, light curing modes, microhardness test. J Bagh Coll Dentistry 2010; 22(1):7-10 | ||
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