title: Resistance of nanofill and nanohybrid resin composites to toothbrush abrasion with calcium carbonate slurry.
abstract: The aim of this study was to investigate the wear of four nanofilled resin composites using simulated toothbrushing for 50,000 cycles with calcium carbonate slurry. The depth of abrasion and roughness (Ra) were measured after each 10,000 brushing cycle. The surface texture of the worn samples was examined by SEM.The wear depths of the nanofill Filtek Supreme XT (FIL), the nanohybrides Grandio (GRA), Tetric EvoCeram (TET), and Venus Diamond (VED) increased linearly with numbers of brushing cycles or approximately 80, 12, 600, and 60 mum, respectively after 50,000 strokes. Surface roughness showed virtually no change between 10,000 and 50,000 brushing cycles; the ranking order was TET < FIL < GRA < VED. FIL showed rather uniform abrasion with nanoclusters protruding from the surface. TET was very smoothly abraded without signs of debonding of the prepolymerized particles, whereas GRA and VED showed pronounced wear of the matrix polymer surrounding larger glass filler particles.
authors.affiliation: Department of Clinical Cariology, Showa University School of Dentistry, Tokyo 145-8515, Japan. suzubin@dent.showa-u.ac.jp
authors.forename: Toshimitsu
authors.initials: T
authors.lastname: Suzuki
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kyoizumi
authors.forename: Werner J
authors.initials: WJ
authors.lastname: Finger
authors.forename: Masafumi
authors.initials: M
authors.lastname: Kanehira
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Endo
authors.forename: Andreas
authors.initials: A
authors.lastname: Utterodt
authors.forename: Hisashi
authors.initials: H
authors.lastname: Hisamitsu
authors.forename: Masashi
authors.initials: M
authors.lastname: Komatsu
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D013499:Surface Properties; D014099:Toothbrushing / Q000295:instrumentation*
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; C509998:Grandio; D011108:Polymers; C501891:Tetric EvoCeram; C488393:Venus (composite resin); D002119:Calcium Carbonate