title: Microhardness evaluation of resin composites polymerized by three different light sources.
abstract: This study examined the surface microhardness of four kinds of resin composites with different fillers and resin matrices. Ten specimens of 2 mm thickness and 4 mm diameter of each resin composite were polymerized using a halogen light, a blue light-emitted diode, and a plasma arc unit. Microhardness evaluation was performed at top and bottom surfaces for each specimen using a Vickers microhardness tester. Furthermore, morphologies of the polished top surfaces of composites cured with blue light-emitted diode were observed using scanning electron microscopy. Results indicated that composites cured with halogen or blue light-emitted diode light yielded higher microhardness values, although it also appeared to depend on the type of composite cured. Plasma arc curing according to manufacturer's instructions yielded the lowest microhardness values for all the materials. Among the materials tested, the nanofilled resin composite displayed the highest microhardness values for each curing regime.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Cumhuriyet University, Sivas, Turkey.
authors.forename: Ihsan
authors.initials: I
authors.lastname: Hubbezoğlu
authors.forename: Giray
authors.initials: G
authors.lastname: Bolayir
authors.forename: Orhan Murat
authors.initials: OM
authors.lastname: Doğan
authors.forename: Arife
authors.initials: A
authors.lastname: Doğan
authors.forename: Ali
authors.initials: A
authors.lastname: Ozer
authors.forename: Bülent
authors.initials: B
authors.lastname: Bek
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000528:radiation effects*; D003748:Dental Equipment; D003799:Dental Stress Analysis; D006219:Halogens; D006244:Hardness / Q000528:radiation effects*; D008027:Light; D008422:Materials Testing; D044367:Phase Transition; D012666:Semiconductors; D014978:Xenon
chemical_list: D003188:Composite Resins; D006219:Halogens; D014978:Xenon