急速加熱型石膏系埋没材で作製したクラウンの適合精度 : リングの加熱開始時期の影響  [in Japanese] The Fit of Crowns Fabricated with Quick-Heating Gypsum-Bonded Investment : The Influence of the Timing of When to Commence Heating  [in Japanese]

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Author(s)

    • 塩沢 育己 SHIOZAWA Ikumi
    • 東京医科歯科大学歯学部歯科補綴学第2講座 Department of Prosthodontics II , Faculty of Dentistry, Tokyo Medical and Dental University
    • 荒井 由紀 ARAI Yuki
    • 東京医科歯科大学歯学部歯科補綴学第2講座 Department of Prosthodontics II , Faculty of Dentistry, Tokyo Medical and Dental University
    • 佐藤 尚弘 SATO Takahiro
    • 東京医科歯科大学歯学部歯科補綴学第2講座 Department of Prosthodontics II , Faculty of Dentistry, Tokyo Medical and Dental University

Abstract

The usage of a newly-developed quick-heating gypsum-bonded investment material is becoming more popular in daily laboratory work because of the shorter time required from investing to casting.<BR>Since setting expansion of this investment material stops when heating begins, the timing of when to commence heating is very important for the accuracy of cast crowns.<BR>The purpose of this study was toclarify the freedom of changing the timing regarding the fitting accuracy of cast crowns.<BR>The conclusions were as follows:<BR>1. When heating commenced within 2.5 hours of investing, the accuracy of the crowns fabricated with this quick-heating investment material (SHOFU Cristobalite PF) was as good as those fabricated with conventional gypsum-bonded investment.<BR>2. If heating commenced more than 2.5 hours after investing, the cast crowns showed a slightly larger vertical seating discrepancy, however, this was still within the range of clinical acceptability.<BR>3. In spite of the fact that setting expansion of this quick-heating investment material stopped 2 hours after investing, casting inaccuracy continued to change. Thus it was suggested that anisotropic mold expansion resulting from setting and thermal expansion of the investment affected casting accuracy.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 43(6), 1028-1033, 1999-12-10

    Japan Prosthodontic Society

References:  16

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008175122
  • 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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