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Article
Effectiveness of Four Different Light-activated Composites Cure with Different Light Energy Densities

Author: Dr. Ali A. Al- Shekhli B.D.S., M.Sc., Ph.D.* د. علي الشيخلي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2006 Volume: 3 Issue: 3 Pages: 224-229
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: This study investigated the influence of light energy density (intensityx time) on the effectiveness of composite cure in view of the curing profiles of lightpolymerizationunits with different light- activated composites to determine theenergy density that satisfies adequate polymerization of all light-activatedcomposites types used in this study.Materials and methods: This study investigated the hardness of the top/bottomsurfaces and hardness ratio of 2-mm thick composite specimens after exposure todifferent light energy densities. Parameters included five light intensities (200, 300,400, 500 and 600 mW/cm2) and seven curing times (20, 40, 60, 90, 120, 150 and180 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 variancerevealed that, most of the hardness ratios exhibited a very highly significantdifference according to intensity, composite type and curing time. The resultsindicated that, Heliomolar and Degufill Mineral light-activated composites requiredapproximately (36 J/cm²) energy density for adequate polymerization for a 2-mmthick specimen while, Herculite XRV and Tertric Ceram light-activated compositesrequired approximately (12 J/cm²) energy density for adequate polymerization for a2-mm thick specimen.Conclusion: This study indicated that, final curing should not be done with energydensity less than (300 mW/cm2 for 120 seconds, 400 mW/cm2 for 90 seconds and600 mW/cm2 for 60 seconds) for Heliomolar and Degufill Mineral light-activatedcomposites.


Article
The Influence of Composite Type and Shade Selection on Depth of Cure of Light-activated Composites

Author: Isra’a A. Al- Aubi B.D.S., M.Sc.* د. اسراء العبيدي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2006 Volume: 3 Issue: 2 Pages: 117-121
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

AbstractBackground: This study investigated the influence of composite type and shade ondepth of cure of light- activated composites.Materials and methods: This study investigated the depth of cure of two compositematerials using two different shades. Parameters included two shades (A1 and C3) oftwo different light-activated composites(Helio Progress and King Dental) cured for 40seconds.Results: Statistical analysis of the data by using the one-way analysis of variancerevealed that, both composite type and shade significantly affect composite depth ofcure.Conclusion: This study indicated that, Although, both composite type and shade weresignificantly affect depth of cure but the effect of composite type on composite depthof cure is much more than that of composite shade.

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