Rheological properties of elastomeric impression materials for selective pressure impression technique

• Kawara Misao

  Department of Oral Function and Rehabilitation, Nihon University School of Dentistry

• Iwasaki Masatoshi

  Nihon University Graduate School of Dentistry

• Iwata Yoshihiro

  Nihon University Graduate School of Dentistry

• Komoda Yoshihiro

  Nihon University Graduate School of Dentistry

• Inoue Sayumi

  Nihon University Graduate School of Dentistry

• Komiyama Osamu

  Department of Oral Function and Rehabilitation, Nihon University School of Dentistry

• Suzuki Hiroshi

  Department of Oral Function and Rehabilitation, Nihon University School of Dentistry

• Kuroki Toshikazu

  Department of Oral Function and Rehabilitation, Nihon University School of Dentistry

• Hashizaki Kaname

  Laboratory of Physical Chemistry, School of Pharmacy, Nihon University

Abstract

Purpose: The selective impression technique is recommended for removable prosthodon- tics. However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. The objective of this study is to clarify the viscoelastic rheological properties of impression materials by focusing on tray seating. Methods: In this study, eight types of polyvinylsiloxane (PVS), two types of polyether, and two types of alginate impression materials were used. The storage modulus (G⁰; degree of stiffness) and loss tangent (tan d; degree of hardening) were determined as functions of time from 0 to 360 s, commencing immediately after the completion of mixing, using a stress control-type rheometer. Thus, G⁰ and tan d at 0 s and 20 s were compared. Results: Stiffness was found to be widely distributed (4.49-0.26 10⁴ Pa) among PVS-types, ? even immediately after mixing the impression material. There was also variation among polyethers (1.55-0.5 10⁴ Pa) and among alginates (0.64-0.21 10⁴ Pa). The hardening of all ? ? impression materials progresses beyond 20 s after the completion of mixing. Conclusions: The G⁰ values varied with each impression material, even immediately after mixing, and the accurate impression-taking time was determined from the results of tan d. These results provide unique insight into the selective impression technique.

Journal

• Journal of Prosthodontic Research

  Journal of Prosthodontic Research 59 (4), 254-261, 2015-10-25

  Japan Prosthodontic Society

Keywords

• Dentistry (miscellaneous)
• Oral Surgery

Details

• CRID: 1390567901494696448
• NII Article ID: 130007936694
• DOI: 10.1016/j.jpor.2015.07.002
• ISSN: 18839207
• ISSN: 18831958
• Web Site: https://api.elsevier.com/content/article/PII:S1883195815000699?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S1883195815000699?httpAccept=text/plain
• Web Site: https://search.jamas.or.jp/link/ui/2016359743
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed