These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Effect of delayed light polymerization of a dual-cured composite base on microleakage of Class 2 posterior composite open-sandwich restorations.
    Author: Atlas AM, Raman P, Dworak M, Mante F, Blatz MB.
    Journal: Quintessence Int; 2009 Jun; 40(6):471-7. PubMed ID: 19587888.
    Abstract:
    OBJECTIVE: To determine the effect of delayed start of light polymerization of a dual-cured composite base on the microleakage of Class 2 open-sandwich composite restorations. METHOD AND MATERIALS: Fifty extracted human molars were used to prepare Class 2 mesio-occlusal and disto-occlusal slot preparations. Teeth were randomly divided into 2 groups and restored with a base of dual-cured composite in the proximal box and a top layer of light-cured composite. Group I was restored with a 1-step dual-cured bonding agent; group II was restored with a 2-step dual-cured bonding agent. Five subgroups were created according to the method of polymerization of the dual-cured composite: (A) self-cured, (B) light-cured immediately, (C) light-cured 30 seconds after placement, (D) light-cured 60 seconds after placement, and (E) light-cured 120 seconds after placement. Restorations were stored for 1 week at 37 degrees C and 100% relative humidity, thermocycled (2,000 times, 5 degrees C to 55 degrees C, 15-second dwell), and immersed in a 1% aqueous solution of methylene blue for 24 hours at 37 degrees C. Samples were sectioned mesiodistally, and dye penetration at enamel, dentin, and cementum margins was scored under a stereomicroscope using an ordinal scoring system. RESULTS: Statistical analysis using analysis of variance (ANOVA) on ranks showed that the dual-cured composite light polymerized 1 minute after placement exhibited the lowest microleakage (P < .05) in both bonding agent groups. CONCLUSION: Delayed, rather than immediate, light polymerization of the dual-cured composite base reduced microleakage in Class 2 open-sandwich restorations.
    [Abstract] [Full Text] [Related] [New Search]