Accuracy of open tray implant impressions: an in vitro comparison of stock versus custom trays

J Burns, R Palmer, L Howe, R Wilson

    Research output: Contribution to journalArticlepeer-review

    86 Citations (Scopus)

    Abstract

    Statement of problem. The accuracy of an implant fixture-level impression is affected by the type of impression tray used. Purpose. The purpose of this in vitro study was to investigate the accuracy of open tray implant impressions comparing polycarbonate stock impression trays and rigid custom-made impression trays to make implant fixture-level impressions. Material and methods. Gold cylinder pairs, splinted by gold bars (reference frameworks) were constructed on an aluminum typodont. Polyether impressions were made of 2 pairs of Branemark 3.75-mm diameter fixtures mounted in an aluminium typodont, with 3 stock impression trays, 3 close-fit custom trays, and 3 spaced custom impression trays, by use of an open tray technique. The casts produced were assessed for accuracy by attaching the reference frameworks with alternate single screws and measuring the vertical fit discrepancy of these reference frameworks to the analogs within the working cast using a traveling microscope. Comparison of gap dimensions by tray type was performed with a nonparametric Kruskal-Wallis analysis of variance (ANOVA) followed by pair-wise Mann-Whitney U tests. To adjust for multiple comparisons in the post-ANOVA contrasts (P
    Original languageEnglish
    Pages (from-to)250 - 255
    Number of pages6
    JournalJournal of Prosthetic Dentistry
    Volume89
    Issue number3
    DOIs
    Publication statusPublished - Mar 2003

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