Dimensional Accuracy of Two-Step Impressions Measured on Scanned Casts in CAD

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
Zoltán BaráthMárta Radnai

Abstract

The purpose of the study was to find out how light-body impression material thickness influences the horizontal dimensional accuracy of casts examined on a scanned model. Customized manikin mandibles were used for impression taking with a dual-phase impression method. These mandibles were prepared in a way that allowed the control of light-bodied impression material thickness. First premolars were prepared for a full crown by supragingival chamfer on both sides in all mandibles. For the measurements, buccal and lingual reference points were made at the preparation margin. Impressions were taken at nine thickness levels and a control level (TTotal = 10; 0-1.2 mm), and the reference points' average distance was compared across thickness levels on both the left and right side. We carried out three measures for each specimen and used three specimens per thickness level. Total sample size was N = 180, creating a sizable database to understand the influence. The results indicated that light-body impression material thickness had no influence on the horizontal dimension of a die measured on scanned dies in these specific circumstances. The thickness of light-body impression material in the dual-phase impression taking technique did no...Continue Reading

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