title: Resin content in cement liquids of resin-modified glass ionomers.
abstract: Qualitative and quantitative analyses were conducted on four kinds of resin-modified glass ionomer (RMGI) cement liquids, LC, LC II, LC III (hereinafter referred to as LCs) and VM, using HPLC and laser Raman spectroscopic methods. HPLC revealed that among the RMGI liquids LCs contain 31-32% HEMA (2-Hydroxyethyl methacrylate), and VM contains 18% of the same. The composition of RMGI cement liquids varied significantly between manufacturers. In Raman spectroscopic analyses, the spectra of liquids of various ratios of polyacrylic acid and HEMA were measured, and calculations were made on the peak intensity ratios of C=C stretch vibration to C=O stretch vibration, common in both HEMA and polyacrylic acid. The composition ratio of polycarboxylic acid to HEMA of commercial glass ionomer cements was assessed by the regression curve generated by a combination of peak intensity ratios and composition ratios. In addition, Raman spectroscopy was able to identity the differences in form of the methacryloyloxy group.
authors.affiliation: Department of Pediatric Dentistry, Showa University School of Dentistry, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ikeda
authors.forename: A
authors.initials: A
authors.lastname: Fujishima
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Inoue
authors.forename: R
authors.initials: R
authors.lastname: Sasa
authors.forename: T
authors.initials: T
authors.lastname: Miyazaki
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D015394:Molecular Structure; D012117:Resins, Synthetic / Q000737:chemistry; D013059:Spectrum Analysis, Raman
chemical_list: D002264:Carboxylic Acids; D020770:Compomers; D003188:Composite Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; D012117:Resins, Synthetic; C084550:Vitremer; C090915:GC Fuji III; C084541:Fuji glass-ionomer lining cement; C005044:hydroxyethyl methacrylate