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Clinical Oral Investigations
Published in: Clinical Oral Investigations 4/2016

01-05-2016 | Original Article

Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions

Authors: Cristina Zarauz, Arelhys Valverde, Francisco Martinez-Rus, Bassam Hassan, Guillermo Pradies

Published in: Clinical Oral Investigations | Issue 4/2016

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Abstract

Objectives

The aim of this study is to compare the fit of all-ceramic crowns fabricated from conventional silicone impressions with the fit of all-ceramic crowns fabricated from intraoral digital impressions.

Methods

Twenty patients with 26 posterior teeth with a prosthetic demand were selected for the study. Two crowns (Straumann-Zerion) were made for each preparation. One crown was fabricated from an intraoral digital impression system (IDI group; Cadent-iTero), and the other crown was fabricated from a conventional one-step silicone impression (CI group; Express Penta Putty and Body Light). To replicate the interface between the crown and the preparation, each crown was cemented on its corresponding clinical preparation with ultra-flow silicone (Express Ultra Light Body). Each crown was embedded in resin to stabilize the registered interface, cut in 2-mm-thick slices in a buco-lingual orientation. Internal misfit was measured in microns using stereomicroscopy with a magnification of ×40. Measurements were taken at different landmarks: margin, chamfer angle, axial, crest, and occlusal fosse. After checking for normality, data was analyzed using paired Student’s t test (α = 0.05).

Results

Fit values were significantly affected by the impression technique (p = 0.000). Mean internal misfit and mean marginal misfit were 111.40 μm (SD = 54.04)/80.29 μm (SD = 26.24) for the crowns of the IDI group and 173.00 μm (SD = 92.65)/133.51 μm (SD = 48.78) for the CI group.

Conclusion

All-ceramic crowns fabricated from intraoral digital impressions with parallel confocal technology demonstrated a clinically acceptable internal and marginal fit as conventional impression.

Clinical significance

Intraoral digital impressions as initial step to the digital workflow could further improve the marginal adaptation of all ceramic single crowns.
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Metadata
Title
Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions
Authors
Cristina Zarauz
Arelhys Valverde
Francisco Martinez-Rus
Bassam Hassan
Guillermo Pradies
Publication date
01-05-2016
Publisher
Springer Berlin Heidelberg
Published in
Clinical Oral Investigations / Issue 4/2016
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI
https://doi.org/10.1007/s00784-015-1590-5

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