GD572 - Effect of different photoinitiator systems on the mechanical properties of experimental resin cements-GD572 Article

GD572 Article

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The study assessed whether photoinitiator systems affect the mechanical properties of light-cured resin cements. Researchers compared three experimental cements—camphorquinone (CQ) with DMAEMA, BAPO with DMAEMA, and BAPO alone—with the commercial cement RelyX Veneer. Ten specimens per cement were tested for flexural strength and modulus, and 10 disc specimens per cement were assessed for Knoop microhardness.<br /><br />Photoinitiator choice significantly affected the results. RelyX Veneer had the highest flexural strength (57.34 MPa), exceeding both BAPO-containing experimental cements. The CQ/DMAEMA cement had the lowest value (38.42 MPa); it was significantly weaker than the control and BAPO-only cement, but not significantly different from the BAPO/DMAEMA cement.<br /><br />The BAPO-only cement had a higher flexural modulus than the CQ/DMAEMA cement, while other group comparisons were not significant. Both BAPO-containing cements showed greater microhardness than the commercial control, which in turn was harder than the CQ/DMAEMA cement.<br /><br />The findings reject the hypothesis that photoinitiator systems have no effect on mechanical properties. Overall, BAPO-containing cements had properties comparable to or better than the commercial cement, although their flexural strength was lower. Further studies are needed to assess other factors, including degree of conversion, bond strength, color stability, solubility, and biocompatibility, before drawing conclusions about clinical performance.

Keywords

photoinitiator systems

light-cured resin cements

flexural strength

flexural modulus

Knoop microhardness

camphorquinone

BAPO

DMAEMA

RelyX Veneer

mechanical properties