Dimensional accuracy of a new polyether impression material

Tatsuo Endo, Werner J. Finger

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    Objectives: The purpose of this study was to evaluate the dimensional accuracy of stone dies produced from standardized impressions with 1 new and 1 conventional polyether impression material and a polyvinyl siloxane reference material. Methods and materials: Impressions with the polyether materials P2 and impregum and with the polyvinyl siloxane Flexitime were produced at 23°C or 37°C from a truncated steel cone in cylindrical steel trays giving 4-mm impression layer thickness at the prominence line. Stone dies were poured after 1 or 24 hours of storage at ambient atmosphere. Additional impressions were stored at different relative humidity levels (0%, 33%, 50%, 75%, or 100%) for 24 hours prior to die pouring. The accuracy of the stone dies was determined as axial discrepancy between a steel ring, which fit perfectly on the steel die and the occlusal die surface. The base-diameter deviation (Δd) was calculated. Results: After 1 hour, a similar increase in Δd was noticed for impression materials when dies were poured at impression temperature. Impressions made at 37°C exhibited significantly higher Δd than at 23°C. Light-bodied P2 showed the highest Δd increase when dies were poured after 24 hours. Flexitime showed moderate Δd differences at the 2 pouring times. The Δd of dies made from polyether materials decreased significantly with increasing humidity, whereas polyvinyl siloxane was not adversely affected. Conclusion: The dimensional accuracy of P2 is comparable to that of the conventional polyether impression material after short-term storage. Polyethers may absorb water, significantly compromising die accuracy upon storage at high humidity.

    Original languageEnglish
    Pages (from-to)47-51
    Number of pages5
    JournalQuintessence International
    Volume37
    Issue number1
    Publication statusPublished - 2006 Jan 1

    Keywords

    • Dimensional accuracy
    • Elastomeric impression materials
    • Polyether
    • Polyvinyl siloxane
    • Storage humidity
    • Storage time

    ASJC Scopus subject areas

    • Dentistry(all)

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