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Retention forces of 14-unit zirconia telescopic prostheses with six double crowns made from zirconia—an in vitro study

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Abstract

Objectives

The aim of this study was to evaluate the retention forces (RFs) of zirconia double-crown systems, with primary and secondary crowns made from zirconia in vitro.

Materials and methods

Ten maxillary models with six abutment teeth were prepared. Sixty inner crowns were fabricated from pre-sintered zirconia with a taper of 0°. Ten 14-unit telescopic prostheses (removable partial dentures, RDPs) were fabricated, using the same computer-aided design/computer-aided manufacturing system as that used for the inner crowns. The removal test was performed in a standardized setup using a universal testing device at a crosshead speed of 10 mm/min. Ten separation cycles were carried out for each single primary crown as well as for each 14-unit RDP in the presence of artificial saliva. The results were imported into a statistic program and analysed by a one-way ANOVA and post hoc tests. The level of significance was set at 5 %.

Results

The mean RFs of the single double-crown systems were in the range of 0.611–2.895 N, whereas the RFs for the whole RDP varied between 8.1 and 13.6 N. RF was dependent on the abutment tooth (p < 0.001) and on the model (p < 0.001).

Conclusions

The results of this study indicate that the manufacturing of full-zirconia double-crown systems is possible as well as reproducible. The RFs are comparable to those reported from casted and electroformed double-crown systems.

Clinical relevance

It has been shown that the RFs of the presented telescopic system are comparable to existing double-crown systems.

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Acknowledgments

The authors wish to thank Enrico Steger (Zirkonzahn, Gais, Südtirol, Italy) for supporting the study with the milling unit M5 and all necessary materials. The authors would like to sincerely thank Josef Schweiger (head of the dental laboratory) for his assistance whenever technical problems had to be resolved.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Prosthodontics, Ludwig-Maximilians University, Goethestraße 70, 80336, Munich, Germany

    Julian Groesser, Caroline Sachs, Philipp Heiß, Kurt Erdelt & Florian Beuer

  2. Stadelmann Dental, Fraunhoferstraße 30, 80469, Munich, Germany

    Markus Stadelmann

Authors
  1. Julian Groesser
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  2. Caroline Sachs
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  3. Philipp Heiß
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  4. Markus Stadelmann
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  5. Kurt Erdelt
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  6. Florian Beuer
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Corresponding author

Correspondence to Florian Beuer.

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Groesser, J., Sachs, C., Heiß, P. et al. Retention forces of 14-unit zirconia telescopic prostheses with six double crowns made from zirconia—an in vitro study. Clin Oral Invest 18, 1173–1179 (2014). https://doi.org/10.1007/s00784-013-1093-1

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  • DOI: https://doi.org/10.1007/s00784-013-1093-1

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