title: Evaluation of new tri-methacrylates as a reactive diluent in root canal sealant.
abstract: In this work, a novel tri-methacrylate oligomer, GPTEMA, with three long-branched chain structures was synthesized through the reaction of glycerol propoxylate triglycidyl ether (GPTE) and methacrylic acid. The structure of GPTEMA was confirmed by FT-IR, (1)H-NMR, gel-permeation chromatography (GPC) and element analysis. The GPTEMA was used to partially or completely replace TEGDMA as reactive diluent and applied in a root canal sealant system containing Bis-GMA. The effects of GPTEMA on the polymerization behavior of Bis-GMA/TEGDMA/GPTEMA co-polymer and properties of its polymerizing product were investigated. Polymerization shrinkage, double bond conversion, glass transition temperature, flexural strength, flexural modulus, water sorption and diffusion coefficient of the Bis-GMA/TEGDMA/GPTEMA co-polymer were measured. The results illustrated that the Bis-GMA/TEGDMA/GPTEMA co-polymer attained lower polymerization shrinkage and higher double bond conversion. However, its T g, flexural strength and flexural modulus decreased with increasing content of GPTEMA, water sorption and diffusion coefficient increased with increasing content of GPTEMA.
authors.affiliation: a College of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P.R. China. mcfliu@126.com.
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Lingling
authors.initials: L
authors.lastname: Liao
authors.forename: Jingwei
authors.initials: J
authors.lastname: He
authors.forename: Yuanfang
authors.initials: Y
authors.lastname: Luo
authors.forename: Demin
authors.initials: D
authors.lastname: Jia
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002850:Chromatography, Gel; D004058:Diffusion; D005898:Glass / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry; D015394:Molecular Structure; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D066244:Proton Magnetic Resonance Spectroscopy; D012387:Root Canal Filling Materials / Q000138:chemical synthesis / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D044366:Transition Temperature; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D008689:Methacrylates; D011109:Polymethacrylic Acids; D012387:Root Canal Filling Materials; D014867:Water; C020946:triethylene glycol dimethacrylate; C008384:methacrylic acid; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate