title: Development of metal-resin composite restorative material. Part 2. Effects of acid and heat treatments of silver-tin filler particles on flexural properties of metal-resin composite.
abstract: The effects of acid and heat treatments of silver-tin filler particles on the flexural properties of metal-resin composite restorative materials were investigated. Five metal-resin composite restorative materials containing different silver-tin filler particles treated under different conditions were experimentally prepared. The conditions of the alloy particles were; 1) as atomized (NT), 2) 1.8% HCl acid-treated (AT), 3) heat-treated at 150 degrees C for 5 min after AT (A15), 4) heat-treated at 200 degrees C for 5 min after AT (A20) and 5) heat-treated at 250 degrees C for 5 min after AT (A25). The flexural strength and the flexural modulus of elasticity were measured for the five metal-resin composites to evaluate the effects of the acid and heat treatments. The flexural strength of the prepared composites was significantly influenced by the surface condition of the filler particles (p < 0.01), and increased significantly when the as atomized particles (NT) were acid-treated (AT) or acid- and heat-treated at 150 degrees C (A15), but then significantly decreased as the heat treatment temperature increased (A20 and A25). The strength of the A15 composite was significantly higher than those of the other composites, and exceeded that (about 60 MPa) of the previous composite with no treatment. No significant difference was found in the flexural modulus of the composites.
authors.affiliation: Department of Dental Materials Science, School of Dentistry at Niigata, Nippon Dental University, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Urapepon
authors.forename: K
authors.initials: K
authors.lastname: Kakuta
authors.forename: Y
authors.initials: Y
authors.lastname: Miyagawa
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: D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004548:Elasticity; D004577:Electron Probe Microanalysis; D006358:Hot Temperature; D006851:Hydrochloric Acid; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D012834:Silver; D013499:Surface Properties; D014001:Tin
chemical_list: D000180:Acrylic Resins; 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; C031172:4-META resin; D006851:Hydrochloric Acid