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Effectiveness of four different light-activated composites cure with different light energy densities | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 18, Issue 3, 2006, Pages 12-16 | ||
| Authors | ||
| a A. Al- Aubi; ; Haitham J. Al-Azzawi; Ali A. Al- Shekhli | ||
| Abstract | ||
| ABSTRACTBackground: This study investigated the influence of light energy density (intensity x time) on the effectiveness of composite cure in view of the curing profiles of light-polymerization units with different light- activated composites to determine the energy density that satisfies adequate polymerization of all light-activated composites types used in this study.Materials and methods: This study investigated the hardness of the top/bottom surfaces and hardness ratio of two mm thick composite specimens after exposure to different light energy densities. Parameters included five light intensities (200, 300, 400, 500 and 600 mW/cm2) and seven irradiation times (20, 40, 60, 90, 120, 150 and 180 seconds) 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, most of the hardness ratios exhibited a very highly significant difference according to intensity, composite type and curing time. The results indicated that, Heliomolar and Degufill Mineral light-activated composites required approximately (36 J/cm²) energy density for adequate polymerization for a two-mm thick specimen while, Herculite XRV and Tertric Ceram light-activated composites required approximately (12 J/cm²) energy density for adequate polymerization for a 2-mm thick specimen.Conclusion: This study indicated that, final curing should not be done with energy density less than (300 mW/cm2 for 120 seconds, 400 mW/cm2 for 90 seconds and 600 mW/cm2 for 60 seconds) for Heliomolar and Degufill Mineral light-activated composites.Key words: Resin composite, light curing, microhardness, photo-activation. (J Bagh Coll Dentistry 2006; 18(3)12-16) | ||
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