title: Properties of opaque resin composite containing coated and silanized titanium dioxide.
abstract: Titanium dioxide (TiO2) is mainly used as a pigment in opaque resin composites for application to the surface of a metal framework. The hypothesis in this paper is that particles of silica/alumina (SiO2/Al2O3)-coated TiO2 treated with a silane coupling agent could bond effectively with resin monomers of opaque resin composites. Untreated TiO2 was used as the control filler. Compressive and flexural strength specimens were prepared by the heat-curing method, because these bulk specimens could not be made by the typical photo-curing method. The treated composite had significantly higher compressive and flexural strengths than the untreated composite after 6 months' immersion in water. Scanning electron microscopy of the fractured composite surfaces showed an interface failure between TiO2 and resin for the untreated composite and cohesive failure within the resin for the treated composite after 6 months' immersion. The light-activated opaque resin composite containing treated TiO2 exhibited significantly higher bond strength to a noble dental alloy after 5000 thermal cycles than that containing untreated TiO2. Thus, silanized SiO2/Al2O3-coated TiO2 appears to be clinically useful as a filler of opaque resin composites.
authors.affiliation: Department of Fixed Prosthodontics, Nagasaki University School of Dentistry, Sakamoto, Japan. keiichi@net.nagasaki-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: Y
authors.initials: Y
authors.lastname: Taira
authors.forename: M
authors.initials: M
authors.lastname: Atsuta
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D019245:Compressive Strength; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D006047:Gold Alloys / Q000737:chemistry; D006358:Hot Temperature; D006801:Humans; D007101:Immersion; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009757:Nylons / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D010860:Pigments, Biological / Q000737:chemistry; D018583:Pliability; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry*; D014867:Water
chemical_list: D020099:Coated Materials, Biocompatible; D003188:Composite Resins; D003722:Dental Alloys; D006047:Gold Alloys; D008689:Methacrylates; D009757:Nylons; D010860:Pigments, Biological; D011109:Polymethacrylic Acids; D012821:Silanes; C407037:poly(2-(dimethylamino)ethyl methacrylate); D014867:Water; C020946:triethylene glycol dimethacrylate; C009495:titanium dioxide; D012834:Silver; D011092:Polyethylene Glycols; D010165:Palladium; D012822:Silicon Dioxide; D014025:Titanium; D000537:Aluminum Oxide