Accuracy of Single-Step versus 2-Step Double-Mix Impression Technique. (25th July 2011)

• Record Type: Journal Article
• Authors: Franco, Eduardo Batista; da Cunha, Leonardo Fernandes; Herrera, Francyle Simões; Benetti, Ana Raquel
• Other Names: Cardash H. S. Academic Editor.; Sperber G. H. Academic Editor.
• Is Part Of: ISRN dentistry. Volume 2011(2011)
• Publication Date: 2011-07-25
• Subjects: Dentistry -- Periodicals; 617.6
• DOI: 10.5402/2011/341546
• Languages: English
• ISSNs: 2090-4371

Abstract

Abstract : Objective . To investigate the accuracy of dies obtained from single-step and 2-step double-mix impressions. Material and Methods . Impressions (n = 10 ) of a stainless steel die simulating a complete crown preparation were performed using a polyether (Impregum Soft Heavy and Light body) and a vinyl polysiloxane (Perfectim Blue Velvet and Flexi-Velvet) in two consistencies, in one or two (without relief) steps. Accuracy of the stone dies was accessed at a measuring microscope, using a metallic crown with perfect fit to the reference crown preparation. Data were submitted to 2-way ANOVA and Tukey test (α = 0.05 ). Results . The single-step technique resulted in slightly larger dies, while the 2-step technique without relief produced significantly smaller dies, when compared to the original stainless steel die. Stone dies obtained from 2-step polyether impressions were significantly smaller when compared to dies obtained from 2-step vinyl polysiloxane impressions (Impregum 2-step: −290.94 ± 71.64 μm; Perfectim 2-step: −201.86 ± 28.58 μm). No significant differences were observed in dies obtained from either polyether or vinyl polysiloxane with the single-step technique (Impregum single-step: 63.52 ± 16.60 μm; Perfectim single-step: 79.40 ± 14.11 μm). Conclusion . Higher discrepancies were detected for the 2-step impression technique without relief for the investigated materials.