title: Effects of monomer composition and original filler content on filler loading in the resulting centrifuged composites.
abstract: 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.
authors: Department of Specialized Dentistry, Nagasaki University Hospital of Medicine and Dentistry, 1-7-1, Sakamoto, Nagasaki 852-8501, Japan. t-naomi@net.nagasaki-u.ac.jp
authors: Naomi
authors: N
authors: Tanoue
authors: Atsushi
authors: A
authors: Mikami
authors: Mitsuru
authors: M
authors: Atsuta
authors: Hideo
authors: H
authors: Matsumura
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002498:Centrifugation; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006244:Hardness; D008422:Materials Testing; D036103:Nanotechnology; D011140:Polyurethanes / Q000737:chemistry*; D014783:Viscosity
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D003764:Dental Materials; D011140:Polyurethanes