Journal of Dentistry
Volume 34, Issue 4 , Pages 307-315, April 2006

An alcohol-free tissue conditioner—A laboratory evaluation

  • Hiroshi Murata

      Affiliations

    • Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
    • Corresponding Author InformationCorresponding author. Tel.: +81 82 257 5681; fax: +81 82 257 5684.
    • ,
  • Yasushi Narasaki

      Affiliations

    • Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
    • ,
  • Taizo Hamada

      Affiliations

    • Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan
    • ,
  • John F. McCabe

      Affiliations

    • Dental Materials Science Unit, The Dental School, University of Newcastle upon Tyne, Framlington Place, Newcastle upon Tyne NE2 4BW, UK

Received 7 April 2005; received in revised form 12 July 2005; accepted 18 July 2005.

Summary 

Objectives

An alcohol-free tissue conditioner based on a n-butyl methacrylate/i-butyl methacrylate copolymer has recently been developed. The purpose of the present study was to compare some key properties of the new tissue conditioner with those of poly(ethyl methacrylate)-based conventional materials containing ethyl alcohol. The effect of a coating, which consisted of poly(ethyl methacrylate) and methyl methacrylate, was also evaluated.

Methods

The new alcohol-free tissue conditioner (Fictioner) and three tissue conditioners containing ethyl alcohol (FITT, Hydro-Cast, SR-Ivoseal) were evaluated. The coated alcohol-free material was also used. Gelation characteristics, dynamic viscoelastic properties and compatibility with dental stones were measured using a displacement rheometer, dynamic viscoelastometer and profilometer, respectively. In addition, weight changes during immersion in water were determined.

Results

The working time and gelation time of the alcohol-free tissue conditioner were similar to those of the conventional materials. This alcohol-free material had significantly lower shear storage modulus and shear loss modulus, and higher loss tangent (P<0.05) than FITT and SR-Ivoseal at 0.01 and 1Hz. The alcohol-free material maintained its inherent viscoelastic properties and exhibited only a slight change in weight during 14 days of water immersion when compared to the conventional materials. The application of the coating significantly reduced the loss of the initial viscoelastic properties and surface quality during the test periods.

Conclusions

The coated alcohol-free tissue conditioner would be superior to the conventional materials containing ethyl alcohol in view of viscoelastic properties after gelation, compatibility with dental stones and durability.

Keywords: Tissue conditioners, n-Butyl methacrylate/i-butyl methacrylate copolymers, Ethyl alcohol, Gelation, Dynamic viscoelasticity, Weight change, Surface roughness

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PII: S0300-5712(05)00149-1

doi:10.1016/j.jdent.2005.07.005

Journal of Dentistry
Volume 34, Issue 4 , Pages 307-315, April 2006

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