title: Effect of filler particles morphology of resin-composites on cavity packing force for repeated condensation.
abstract: Effect of variation in morphology and size of filler particles, temperature and increase in condensation speed on packability of resincomposites was investigated. Eight experimental light-cured resin-composites (RZDn series) were tested. Each material was placed in a cylindrical mould at 26 or 32ºC. A flat-ended stainless-steel probe (φ=6 mm) was mechanically lowered with two different speeds 2 and 8 mm/s onto and into at the surface of the unset sample until a compressive force of 1 N was reached. This was repeated for five cycles, and from each cycle Fpwas calculated. All spherical and irregular filler particle resin-composites showed a decrease in Fpwith increase in number of compressions. Increase in temperature also decreased Fp, but this effect was not very prominent in the case of irregular filler resin-composites. Filler particle morphology, increase in temperature and compression cycle speed has a prominent effect on packability of resin-composites.
authors.affiliation: Dental Materials Department, Army Medical College, National University of Medical Sciences.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Kaleem
authors.affiliation: School of Dentistry, JR Moore Building, University of Manchester.
authors.forename: David C
authors.initials: DC
authors.lastname: Watts
mesh_terms: D003188:Composite Resins; D008422:Materials Testing; D055595:Mechanical Phenomena; D010316:Particle Size; D013499:Surface Properties; D013696:Temperature
chemical_list: D003188:Composite Resins
keywords: Cyclic loading; Filler morphology; Packability; Resin composite