Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

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  • TANOUE Naomi
    Department of Specialized Dentistry, Nagasaki University Hospital of Medicine and Dentistry
  • MIKAMI Atsushi
    Department of Fixed Prosthodontics, Nihon University School of Dentistry
  • ATSUTA Mitsuru
    Division of Fixed Prosthodontics and Oral Rehabilitation, Nagasaki University Graduate School of Biomedical Sciences
  • MATSUMURA Hideo
    Department of Fixed Prosthodontics, Nihon University School of Dentistry

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This study examined the effects of monomer composition, original filler content, and application of centrifugal force on the resulting filler loading of composites. Either Bis-MPEPP or UDMA was mixed with TEGDMA at a molar ratio of 1: 1. Silane-treated silica (14-20 wt%) was added to each mixture. After the mixtures were centrifuged and light-polymerized, rate of increase was determined as the filler increment of 2.0-mm-high, disk-shaped sections of specimen when compared against the uncentrifuged filler content. Both the original filler loading and monomer composition influenced the filler content of the centrifuged composites. Fillers in Bis-MPEPP-based composites exhibited a higher rate of condensation after application of centrifugal force than did UDMA-based composites. The results were suggestive of underlying relationships among the composition, component stability, and post-polymerization properties of flowable composites.

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