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Objective: This systematic review aimed to analyze if polywave light curing units can polymerize Bulk Fill resin composites better than monowave. Materials and methods: Inclusion criteria were in vitro studies that evaluated the polymerization of Bulk Fill resin composites by monowave and/or polywave light curing units. Selection of studies, data extraction, and risk-of-bias analysis were performed. Data from selected studies were qualitatively analyzed. A systematic search was performed in May 2025 using PubMed/Medline, EBSCO/Medline, Scopus, and ISI Web of Science databases and grey literature in English, and 788 studies were found. Results: A total of 65 studies were included in the qualitative analysis. Seventeen of them were investigating both monowave and polywave light-curing units for the polymerization of Bulk Fill resin composites. The evidence was graded as medium quality due to the medium risk of bias for most studies. Polywave LED LCUs improved the microhardness ratio, or DC, of Bulk Fill resin composite compared to monowave in 3 of the included studies, while 3 studies revealed that monowave LED LCUs demonstrated a favorable microhardness ratio, or DC, compared to polywave, and the rest of the 11 studies presented material-dependent results. Due to the heterogeneity of the studies included, a meta-analysis was not performed. Conclusion: The existing studies, with their limitations, revealed that polywave light curing units do not seem to have an advantage over monowave in the polymerization of Bulk Fill resin composites.
Thomaidis et al. (Mon,) studied this question.