Curing Efficacy of LED and QTH Light Curing Units for Curing Nanocomposite Resins - A Systematic Review

Background: In adequate polymerization of composite resins has been associated with loss of biocompatibility, retention loss, breakage, excessive wear, and restoration softness. The aim of this systematic review was to evaluate the curing depth and surface microhardness of nanocomposite resin cured with LED and QTH Light curing units. Search Strategy: An electronic search was conducted of the PubMed, MEDLINE and MeSH data bases from 1994 to 20th July 2012. Hand searching included relevant journals and bibliographies of all relevant papers and review articles from 1994 to 2012. Main Results: Three studies compared curing depth of nanocomposites cured by LED and QTH. Out of which two showed significant increase in curing depth for LED and One study showed no significant difference. Eight studies compared the surface microhardness out of which three showed significant increase in surface microhardness of nanocomposites cured with LED, one study showed significant increase for nanocompsite cured with QTH and four articles showed no significant difference in microhardness between LED and QTH. Conclusion: LED light curing units offers equal or better performance for curing nanocomposite resins as compared to QTH light curing units.

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