title: Refractive-index-adjustable fillers for visible-light-cured dental resin composites: preparation of TiO2-SiO2 glass powder by the sol-gel process.
abstract: New fillers have been prepared for visible-light-cured (VL) dental resin composites with the refractive index adjustable to that of the resin phase. These SiO2 glass powders containing TiO2 up to 20 wt% were formed by heating to 1000 degrees C ground gels made from a mixture of Ti[OCH(CH3)2]4 and Si(OC2H5)4. With increasing TiO2 content, the refractive index of the prepared power increased linearly, while the optical transmittance at 467 nm decreased linearly. The experimentally formulated VL-cured resin composites, consisting of (TEGDMA and Bis-GMA) monomer mixture and TiO2-SiO2 glass filler, had greater transmittance when the refractive index of the filler matched that of the monomer mixture, resulting in a greater degree of monomer conversion upon irradiation with VL.
authors.affiliation: Department of Dental Materials, School of Dentistry, Hiroshima University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Taira
authors.forename: K
authors.initials: K
authors.lastname: Wakasa
authors.forename: M
authors.initials: M
authors.lastname: Yamaki
mesh_terms: D000433:1-Propanol / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000138:chemical synthesis / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D005782:Gels; D005898:Glass / Q000737:chemistry; D008027:Light; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate; D008768:Methylmethacrylates; D055095:Optics and Photonics; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011208:Powders; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013729:Terpenes / Q000737:chemistry; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D003188:Composite Resins; D005782:Gels; D008689:Methacrylates; D008768:Methylmethacrylates; D011109:Polymethacrylic Acids; D011208:Powders; D012821:Silanes; D013729:Terpenes; C020946:triethylene glycol dimethacrylate; C009495:titanium dioxide; D020366:Methylmethacrylate; D011092:Polyethylene Glycols; C040733:tetraethoxysilane; D017438:Bisphenol A-Glycidyl Methacrylate; C048339:camphoroquinone; D012822:Silicon Dioxide; D000433:1-Propanol; D014025:Titanium; C049840:2-(dimethylamino)ethyl methacrylate