重付加型シリコーンゴム印象材の組成と流動特性  [in Japanese] Composition and Flow Properties of Commercial Polyaddition-type Silicone lmpression Materials  [in Japanese]

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Author(s)

    • 泉田 明男 IZUMIDA Akio
    • 東北大学歯学部歯科補綴学第一講座 1st Department of Prosthetic Dentistry, School of Dentistry,Tohoku University
    • 細谷 誠 HOSOTANI Makoto
    • 東北大学歯学部歯科補綴学第一講座 1st Department of Prosthetic Dentistry, School of Dentistry,Tohoku University
    • 笠原 紳 KASAHARA Shin
    • 東北大学歯学部歯科補綴学第一講座 1st Department of Prosthetic Dentistry, School of Dentistry,Tohoku University
    • 依田 正信 YODA Masanobu
    • 東北大学歯学部歯科補綴学第一講座 1st Department of Prosthetic Dentistry, School of Dentistry,Tohoku University
    • 奥野 攻 OKUNO Osamu
    • 東北大学歯学部歯科理工学講座 Department of Dental Materials Science, School of Dentistry, Tohoku University
    • 木村 幸平 KIMURA Kohei
    • 東北大学歯学部歯科補綴学第一講座 1st Department of Prosthetic Dentistry, School of Dentistry,Tohoku University

Abstract

The purpose of this study was to investigate flow characteristics of four commercial polyaddition-type silicone impression materials (Regular Type) before mixing.<BR>Base and catalyst pastes were filler and polymer separated by a centrifugal separator with benzene for component analysis. As a result, weight fraction of filler was 39-55% and the chief ingredient was silica. The main polymer of base and catalyst pastes was polydimethylsiloxane. Especially, base polymer included hydrogen polydimethylsiloxane which was a crosslinking agent. The molecular weight (Mw) of these polymer was mostly about 40, 000-70, 000.<BR>The viscosities of these pastes before mixing were measured by a cone-plate viscometer. Both base and catalyst pastes demonstrated pseudoplastic behavior which is the non-Newton flow. Particularly, base pastes showed thixotropic properties because of their clear hysteresis curves and time dependency on the viscosity. One of the base pastes had a yield value.<BR>The inorganic filler significantly affected on flow characteristics of impression materials. The results suggested a means to manufacture impression materials with superior characteristics for working.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 44(4), 504-511, 2000-08-10

    Japan Prosthodontic Society

References:  16

Cited by:  5

Codes

  • NII Article ID (NAID)
    10008156033
  • NII NACSIS-CAT ID (NCID)
    AN00197911
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03895386
  • Data Source
    CJP  CJPref  J-STAGE 
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