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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

Publication:
November/December 2010
Volume 41 , Issue 10

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Comparison Of The Three-Dimensional Correctness Of Impression Techniques: A Randomized Controlled Trial

Ralph Gunnar Luthardt, Prof Dr Med Dent/Michael H. Walter, Prof Dr Med Dent/Sebastian Quaas, Dr Med Dent/Rainer Koch, Prof Dr Med Dent/Heike Rudolph, Dr Med Dent

Pages: 845853
PMID: 20927421

Objective: In vitro studies showed superior impression correctness for one-stage impressions. However, clinical data, especially clinical trials, are lacking in this matter. The aim of the study was to investigate the three-dimensional correctness of impressions for final restorations applying three different impression techniques. Method and Materials: Three impressions each were made from 48 patients with different techniques using metal stock trays. In a randomized order, one-stage putty-wash, two-stage putty-wash, and monophase impressions (respectively, Dimension Penta H and Garant L, Dimension Penta H Quick and Garant L Quick, Impregum Penta; 3M ESPE) were made with either polyvinyl siloxane or polyether materials. The double-cord technique was applied at all abutment teeth. Factors potentially influencing the correctness of the impressions were recorded. The precision of the impressions was three-dimensionally analyzed using the resulting gypsum models. Discrepancies between the impressions were calculated using the one-stage putty-wash impression as reference. Results: Discrepancies between the one-stage putty-wash impressions and the monophase impressions are significantly lower compared with two-stage putty-wash impressions. The depth of the most subgingival portion of the preparation margin significantly influences the discrepancies between the impression techniques. Conclusion: In light of the major influence of clinical parameters on impression correctness, one-stage procedures should be favored. These findings support the results of in vitro investigations. (Quintessence Int 2010;41:845853)

Key words: crown, fixed partial denture, impression, monophase, one-stage putty wash, randomized controlled trial, three-dimensional precision, two-stage putty wash

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