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Marginal and internal fit of posterior three-unit fixed zirconia dental prostheses fabricated with two different CAD/CAM systems and materials

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Abstract

Objectives

The purpose of this in vitro study was to compare the precision of fit of frameworks milled from semi-sintered regular zirconia and high-translucent (HT) zirconia blanks, fabricated with two different CAD/CAM systems.

Material and methods

Three-unit, posterior fixed dental prostheses (FDP) frameworks were fabricated for standardized dies (n = 11) with two different laboratory computer-aided design (CAD)/computer-aided manufacturing (CAM) systems (Cercon/Ceramill). The replica technique was used to evaluate the marginal and internal fit under an optical microscope. Evaluation of the data was performed according to prior studies at a level of significance of 5%.

Results

The systems showed a statistically significant influence on the internal fit of the frameworks (p ≤ 0.001) and on the marginal fit (p < 0.001). The type of material showed no influence on the marginal fit for the Cercon system (p = 0.636) and on the marginal fit (p = 0.064) and the internal fit (p = 0.316) for the Ceramill system, while regular zirconia from Cercon showed higher internal values than HT zirconia (p = 0.016).

Conclusions and clinical relevance

Both investigated systems showed clinically acceptable values within the limitations of this in vitro study. However, one showed less internal accuracy when regular zirconia was used.

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Acknowledgements

DeguDent and Amann Girrbach supported this study with materials. The authors would like to thank the laboratory staff of the prosthodontic department of Munich Dental School for their support, especially to Josef Schweiger and John Meinen.

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Authors and Affiliations

  1. Department of Prosthodontics, Munich Dental School, Goethestr. 70, 80336, Munich, Germany

    Joana Schönberger, Kurt-Jürgen Erdelt & Florian Beuer

  2. Hürzeler/Zuhr Private Practice, Rosenkavalierplatz 18, 81925, Munich, Germany

    Daniel Bäumer

  3. Department of Prosthodontics, Charité UniversityMedicine Berlin, Assmannshauserstrasse 4-6, 14197, Berlin, Germany

    Florian Beuer

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  1. Joana Schönberger
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  2. Kurt-Jürgen Erdelt
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  4. Florian Beuer
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Correspondence to Florian Beuer.

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No funding was obtained for this study.

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Schönberger, J., Erdelt, KJ., Bäumer, D. et al. Marginal and internal fit of posterior three-unit fixed zirconia dental prostheses fabricated with two different CAD/CAM systems and materials. Clin Oral Invest 21, 2629–2635 (2017). https://doi.org/10.1007/s00784-017-2064-8

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  • DOI: https://doi.org/10.1007/s00784-017-2064-8

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