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Excerpt from Abstract

Purpose: This study investigated the leaching of monomers from bulk-fill composites, as well as physical properties of the materials

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Conclusion: The leaching of monomers increased dramatically when a distance from the light tip to the material was introduced. This indicated that a  prolonged curing time, relative to that given by the manufacturer, may be necessary in clinical situations in order to retain an optimal performance of the material


Reference
Leaching of monomers from bulk-fill composites
Kopperud HBM, Kleven IJS, Knarvang T, Wellendorf H.
Dental Materials 2014; 30: e46.