title: Development of metal-resin composite restorative material. Part 3. Flexural properties and condensability of metal-resin composite using Ag-Sn irregular particles.
abstract: Powder-liquid type metal-resin composites, using Ag-Sn irregular particles as the filler, 4-META as coupling agent and UDMA + TEGDMA as resin matrix, were experimentally prepared under 9 different conditions (three different particle sizes and three different filler contents). The flexural strength and flexural modulus were measured. Three different irregular particle size MRCs without redox-initiator at 94% filler content, as well as amalgam, conventional hybrid composite and Ag-Sn spherical particle MRC were evaluated for condensability. The flexural strength of the Ag-Sn irregular particle MRC was significantly influenced by both the filler particle size and filler contents (p < 0.01). It increased when either the filler content increased or the particles size decreased. The highest flexural strength (97.6 MPa) was obtained from the condition of particles size < 20 microns and 94% filler content. The flexural modulus was significantly influenced by filler content and it increased with increasing filler content. The condensability of the Ag-Sn irregular particle MRC was lower than that of amalgam but much higher than presently available conventional composites and spherical particle MRC.
authors.affiliation: Prosthodontics Department, Faculty of Dentistry, Mahidol University, 6, Yothi Road, Rachathevi, Bangkok, 10400, Thailand.
authors.forename: S
authors.initials: S
authors.lastname: Urapepon
authors.forename: K
authors.initials: K
authors.lastname: Kakuta
authors.forename: H
authors.initials: H
authors.lastname: Ogura
authors.forename: C
authors.initials: C
authors.lastname: Suchatlampong
authors.forename: A
authors.initials: A
authors.lastname: Rittapai
mesh_terms: D000704:Analysis of Variance; D002626:Chemistry, Pharmaceutical; D003188:Composite Resins / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004548:Elasticity; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010316:Particle Size; D018583:Pliability; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014001:Tin / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D012834:Silver; D011092:Polyethylene Glycols; C034139:4-methacryloxyethyltrimellitic acid anhydride; D014001:Tin