Composition and Flow Properties of Commercial Polyaddition-type Silicone Impression Materials.

• Izumida Akio

  1 st Department of Prosthetic Dentistry, School of Dentistry, Tohoku University

• Hosotani Makoto

  1 st Department of Prosthetic Dentistry, School of Dentistry, Tohoku University

• Katakura Naoyuki

  Department of Dental Materials Science, School of Dentistry, Tohoku University

• Kasahara Shin

  1 st Department of Prosthetic Dentistry, School of Dentistry, Tohoku University

• Yoda Masanobu

  1 st Department of Prosthetic Dentistry, School of Dentistry, Tohoku University

• Okuno Osamu

  1 st Department of Prosthetic Dentistry, School of Dentistry, Tohoku University

• Kimura Kohei

  1 st Department of Prosthetic Dentistry, School of Dentistry, Tohoku University

Bibliographic Information

Other Title

• 重付加型シリコーンゴム印象材の組成と流動特性

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

  Japan Prosthodontic Society

Keywords

• silicone
• impression material
• flow characteristics
• filler
• yield value

Details

• CRID: 1390001204408953472
• NII Article ID: 10008156033
• NII Book ID: AN00197911
• DOI: 10.2186/jjps.44.504
• ISSN: 1883177X
• ISSN: 03895386
• Web Site: http://www.jstage.jst.go.jp/article/jjps1957/44/4/44_4_504/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2001026929
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed