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Composites were prepared using four different base monomers (bisphenol A\u2010glycidyl methacrylate [Bis\u2010GMA], urethane dimethacrylate [UDMA], ethoxylated bisphenol\u2010A dimethacrylate [Bis\u2010EMA], and Fit\u2010852) with triethylene glycol dimethacrylate (TEGDMA) used as a co\u2010monomer 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\u00a0mm up to 4\u00a0mm 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\u2010based composites, while Bis\u2010GMA\u2010based composites showed the lowest values. When comparing depth of cure as a function of base monomer type, both Bis\u2010GMA and Bis\u2010EMA showed significantly lower values than UDMA or Fit\u2010852. Composites having 50\u00a0wt% filler showed a significantly higher depth of cure than those with 60 and 70\u00a0wt% filler. Base monomer and filler fraction significantly influence microhardness and depth of cure in these experimental composites.<\/jats:p>","DOI":"10.1111\/eos.12933","type":"journal-article","created":{"date-parts":[[2023,5,1]],"date-time":"2023-05-01T01:49:45Z","timestamp":1682905785000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Effect of monomer composition and filler fraction on surface microhardness and depth of cure of experimental resin composites"],"prefix":"10.1111","volume":"131","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7584-4302","authenticated-orcid":false,"given":"Diana","family":"Leyva del Rio","sequence":"first","affiliation":[{"name":"The Ohio State University, College of Dentistry Division of Restorative and Prosthetic Dentistry  Columbus Ohio 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