Effect of monomer composition and filler fraction on surface microhardness and depth of cure of experimental resin composites

Diana Leyva del Rio; William Michael Johnston

doi:10.1111/eos.12933

journal article Open Access Apr 30, 2023

Effect of monomer composition and filler fraction on surface microhardness and depth of cure of experimental resin composites

Diana Leyva del Rio

William Michael Johnston

European Journal of Oral Sciences Vol. 131 No. 3 · Wiley

View at Publisher Save 10.1111/eos.12933

Abstract

AbstractThis study evaluated microhardness profiles and calculated depths of cure at 80% of the surface microhardness of experimental dental resin composites having different base monomer compositions and different filler fractions. Composites were prepared using four different base monomers (bisphenol A‐glycidyl methacrylate [Bis‐GMA], urethane dimethacrylate [UDMA], ethoxylated bisphenol‐A dimethacrylate [Bis‐EMA], and Fit‐852) with triethylene glycol dimethacrylate (TEGDMA) used as a co‐monomer at three filler:resin matrix weight percent fractions (50:50, 60:40, and 70:30). Uncured material was placed in 3D printed molds and light cured for 40 s from the top surface only. Knoop microhardness was measured at the top of the specimen, and at every 0.5 mm up to 4 mm in depth. Microhardness at the surface increased in all experimental composites as the filler fraction increased. When comparing base monomers, microhardness was the highest in UDMA‐based composites, while Bis‐GMA‐based composites showed the lowest values. When comparing depth of cure as a function of base monomer type, both Bis‐GMA and Bis‐EMA showed significantly lower values than UDMA or Fit‐852. Composites having 50 wt% filler showed a significantly higher depth of cure than those with 60 and 70 wt% filler. Base monomer and filler fraction significantly influence microhardness and depth of cure in these experimental composites.

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Metrics

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Citations

44

References

Details

Published: Apr 30, 2023
Vol/Issue: 131(3)
License: View

Authors

D

Diana Leyva del Rio

The Ohio State University, College of Dentistry Division of Restorative and Prosthetic Dentistry Columbus Ohio USA

W

William Michael Johnston

The Ohio State University, College of Dentistry Division of Restorative and Prosthetic Dentistry Columbus Ohio USA

Cite This Article

Diana Leyva del Rio, William Michael Johnston (2023). Effect of monomer composition and filler fraction on surface microhardness and depth of cure of experimental resin composites. European Journal of Oral Sciences, 131(3). https://doi.org/10.1111/eos.12933

Effect of monomer composition and filler fraction on surface microhardness and depth of cure of experimental resin composites

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