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01-03-2014 | Original Article

Marginal and internal fit of four-unit zirconia fixed dental prostheses based on digital and conventional impression techniques

Authors: Júnio S. Almeida e Silva, Kurt Erdelt, Daniel Edelhoff, Élito Araújo, Michael Stimmelmayr, Luiz Clovis Cardoso Vieira, Jan-Frederik Güth

Published in: Clinical Oral Investigations | Issue 2/2014

Abstract

Objectives

The aim of this in vitro study was to evaluate the marginal and internal fit of CAD/CAM-generated four-unit zirconia fixed dental prostheses made with digital and conventional impressions.

Materials and method

A titanium master model was used. For group conventional impression (CI), 12 polyether impressions of the master model with Impregum^TM were made. For group digital impression (DI), 12 digital impressions of the master model using Lava^TM C.O.S. system were made. The replica technique was applied. The Mann–Whitney U statistical test was applied to detect statistical differences between the groups, in terms of marginal and internal fit. Face-by-face comparisons between groups were also carried out.

Results

Groups DI and CI presented mean marginal fit of 63.96 and 65.33 μm, respectively, and showed no statistically significant difference. Groups DI and CI presented significantly different internal fit with mean values of 58.46 and 65.94 μm, respectively. Group DI showed statistically significantly lower values for marginal and internal fit on premolar mesial face, and on molar distal and palatal faces.

Conclusions

Frameworks fabricated from digital and conventional impressions showed clinically acceptable marginal fit. Frameworks fabricated from digital impression demonstrated better internal fit than ones fabricated from conventional impression. Reviewing each retainer face, digital impression showed better marginal and internal fit at the premolar mesial and molar distal faces.

Clinical relevance

The results of this in vitro study show that digital impressions made with the Lava^TM C.O.S. system and its digital workflow are suitable for fabricating four-unit zirconia frameworks, with regard to marginal and internal fit requirements.

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Title: Marginal and internal fit of four-unit zirconia fixed dental prostheses based on digital and conventional impression techniques
Authors: Júnio S. Almeida e Silva
Kurt Erdelt
Daniel Edelhoff
Élito Araújo
Michael Stimmelmayr
Luiz Clovis Cardoso Vieira
Jan-Frederik Güth
Publication date: 01-03-2014
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 2/2014
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-013-0987-2

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Springer Medicine

Marginal and internal fit of four-unit zirconia fixed dental prostheses based on digital and conventional impression techniques

Abstract

Objectives

Materials and method

Results

Conclusions

Clinical relevance

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objectives

Materials and method

Results

Conclusions

Clinical relevance

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