title: High-pressure infrared and FT-Raman investigation of a dental composite.
abstract: Composite resins are often used as filling materials on load-bearing surfaces of teeth. As masticatory stresses can be high, here, we study the effect of pressure on the behaviour of a dental composite. Using a polymerized wafer, the IR and FT-Raman spectra of a zirconia-containing proprietary composite (Z100, 3M, Minneapolis, MN, USA) were recorded. The high-pressure IR spectra were also recorded. Band assignments were made for the main peaks of both organic and inorganic components. Breaks in the pressure dependences (dv/dP) of the organic components were found at 22 kbar. Different pressure dependences for different vibrational modes of inorganic components were also observed. These data suggest that the network structure of the composite is compacted under high pressure and that both the atomic distance and bonding angles in the network are altered.
authors.affiliation: Department of Chemistry, McGill University, Montreal, Quebec, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: I S
authors.initials: IS
authors.lastname: Butler
authors.forename: D F
authors.initials: DF
authors.lastname: Gibson
authors.forename: I
authors.initials: I
authors.lastname: Stangel
mesh_terms: D001696:Biomechanical Phenomena; D017438:Bisphenol A-Glycidyl Methacrylate / Q000032:analysis; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D005583:Fourier Analysis; D011092:Polyethylene Glycols / Q000032:analysis; D011109:Polymethacrylic Acids / Q000032:analysis; D011312:Pressure; D013055:Spectrophotometry, Infrared / Q000379:methods; D013059:Spectrum Analysis, Raman / Q000379:methods; D015040:Zirconium / Q000032:analysis
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D011109:Polymethacrylic Acids; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D015040:Zirconium; C028541:zirconium oxide