title: Influence of centrifugal force on filler loading of resin composites.
abstract: This study examined the influence of centrifugal force on the filler loading of composites using a light-polymerizing apparatus combined with a centrifuge. To assess uneven filler particle distribution resulting from specimen rotation, two low-viscosity composites (Palfique Estelite LV and Revolution Formula 2) were placed in test tubes, centrifuged, and subsequently light-polymerized with the apparatus. After each specimen was sliced into four disks (2-mm thickness), the inorganic filler content and Knoop hardness number (KHN) of each disk were determined. The results suggested that filler loading of composites could be increased by application of centrifugal force if the filler and monomer components were properly arranged.
authors.affiliation: Department of Specialized Dentistry, Nagasaki University Hospital of Medicine and Dentistry, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan. t-naomi@net.nagasaki-u.ac.jp
authors.forename: Naomi
authors.initials: N
authors.lastname: Tanoue
authors.forename: Atsushi
authors.initials: A
authors.lastname: Mikami
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Yanagida
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Atsuta
authors.forename: Rie
authors.initials: R
authors.lastname: Nomoto
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D002498:Centrifugation / Q000295:instrumentation*; D003188:Composite Resins / Q000737:chemistry*; D003799:Dental Stress Analysis; D006244:Hardness; D008422:Materials Testing; D010316:Particle Size; D044367:Phase Transition; D014783:Viscosity
chemical_list: D003188:Composite Resins; C102735:Revolution (composite resin); C086113:palfique estelite