title: Effect of addition of ethyl alcohol on gelation and viscoelasticity of tissue conditioners.
abstract: The clinical effectiveness of tissue conditioners is influenced by their gelation characteristics and viscoelastic properties after gelation. The purpose of this study was to evaluate the effect of addition of ethyl alcohol (EtOH) on these properties, and to compare the effect of EtOH with that of the powder/liquid (P/L) ratio. Three tissue conditioners were used in this study. The gelation times were obtained with an oscillating rheometer. The viscoelastic properties after gelation were also evaluated by stress relaxation tests. Addition of greater amounts of EtOH produced the shorter gelation time and the larger flow after gelation. Conversely, although the use of a higher P/L ratio produced a shorter gelation time, this procedure leads to a smaller flow after gelation. The results suggested that the addition of EtOH to the liquids of tissue conditioners is an effective method for controlling gelation times and viscoelastic properties after gelation.
authors: Department of Prosthetic Dentistry, Hiroshima University, Faculty of Dentistry, Hiroshima, Japan. hmurata@hiroshima-u.ac.jp
authors: H
authors: H
authors: Murata
authors: T
authors: T
authors: Hamada
authors: Harshini
authors: K
authors: K
authors: Toki
authors: H
authors: H
authors: Nikawa
mesh_terms: D000465:Algorithms; D000704:Analysis of Variance; D001672:Biocompatible Materials / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003822:Denture Liners; D004548:Elasticity; D000431:Ethanol / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D011208:Powders; D012212:Rheology; D012996:Solutions; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014016:Tissue Conditioning, Dental; D014783:Viscosity
chemical_list: D001672:Biocompatible Materials; D003764:Dental Materials; D005782:Gels; D008689:Methacrylates; D008768:Methylmethacrylates; D011208:Powders; D012996:Solutions; C069457:Coe-Soft denture lining material; C069456:Hydro-Cast dental tissue conditioner; D000431:Ethanol; C009931:poly(ethylmethacrylate)