The accuracy of the alginate impressions is sufficient for clinical use in orthodontics and produced, with correct storage, acceptable results even after 2 days. Hydrogum®5 impressions proved to be slightly more accurate than the reference material but less dimensionally stable than the Tetrachrom® impressions. The 3M Espe Position Tray™ seemed to be more practical due to a better retentive effect compared to the Opti-Tray made by Profimed.
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