title: Effect of PMMA polymer on the dynamic viscoelasticity and plasticizer leachability of PEMA-based tissue conditioners.
abstract: The purpose of this study was to determine the effect of PMMA polymer on dynamic viscoelasticity and plasticizer leachability of PEMA-based tissue conditioners. One PEMA polymer and one PMMA polymer were used in powder form with four formulations. The combination of 80 wt% ATBC, 15 wt% BPBG and 5 wt% ethyl alcohol was used as the liquid phase. The dynamic viscoelasticity and plasticizer leaching of each specimen were measured after 0, 1, 3, 7, and 14 days of immersion (37 degrees C distilled water) using DMA and HPLC. A significant difference was found among the materials in the dynamic viscoelasticity and leaching of plasticizer. The materials containing 10 wt% PMMA showed the most stable dynamic viscoelasticity, and showed the lowest leaching of plasticizer. The results suggest that the addition of the PMMA polymer to the powder of a tissue conditioner can improve the durability of the PEMA-based tissue conditioner.
authors.affiliation: Department of Oral Health Care Promotion, Graduate School of Dentistry, Tohoku University, Aoba-ku, Sendai, Japan. hong@m.tains.tohoku.ac.jp
authors.forename: Guang
authors.initials: G
authors.lastname: Hong
authors.forename: Takeshi
authors.initials: T
authors.lastname: Maeda
authors.forename: YingAi
authors.initials: Y
authors.lastname: Li
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Sadamori
authors.forename: Taizo
authors.initials: T
authors.lastname: Hamada
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Murata
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D002951:Citrates / Q000737:chemistry; D003993:Dibutyl Phthalate / Q000031:analogs & derivatives / Q000737:chemistry; D004058:Diffusion; D055119:Elastic Modulus; D004548:Elasticity; D000431:Ethanol / Q000737:chemistry; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry*; D010968:Plasticizers / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D011208:Powders; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D014016:Tissue Conditioning, Dental; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D002951:Citrates; D008768:Methylmethacrylates; D010968:Plasticizers; D011208:Powders; D012997:Solvents; D014867:Water; C014953:2-acetyltributylcitrate; D003993:Dibutyl Phthalate; D000431:Ethanol; C048569:butyl phthalyl butyl glycolate; C009931:poly(ethylmethacrylate); D019904:Polymethyl Methacrylate