Clinical Oral Investigations

, Volume 23, Issue 3, pp 1217–1223 | Cite as

Influence of attachment design and material on the retention of resin-bonded attachments

  • Stan JagodinEmail author
  • Martin Sasse
  • Sandra Freitag-Wolf
  • Matthias Kern
Original Article



The purpose of this laboratory study was to evaluate the influence of the attachment design and material on the retention of resin-bonded attachments (RBAs) before and after dynamic loading.

Materials and methods

Forty-eight caries-free human premolars were prepared for RBAs fabricated either from a CoCr alloy or from zirconia ceramic. Specimens were divided into three groups (n = 16 each). Two groups had a standard attachment design for alloys (group M made from a CoCr alloy and group Z1 made from zirconia ceramic). The third group had an attachment design optimized for zirconia ceramic (group Z2 made from zirconia ceramic). Attachments were bonded to the acid-etched enamel of the premolars using a phosphate monomer containing adhesive resin. Subgroups of eight specimens each were either debonded using a tensile force in a universal testing machine at a cross-head speed of 2 mm/min (S) or were exposed to dynamic loading with 50 N over 1200,000 loading cycles in a chewing simulator prior to debonding (D).


There were no significant differences in the initial failure loads of groups. With the exception of subgroup Z1-D, all specimens survived the dynamic loading. Statistical analysis showed that dynamic loading caused a significant decrease of failure loads in group Z1. In contrast, subgroup Z2-D exhibited significantly higher failure loads compared to the subgroup Z1-D.


The results suggest that zirconia RBAs fabricated with an optimized attachment design may be a valid clinical alternative to metal RBAs.

Clinical relevance

Clinical data on the long-term potential of zirconia RBAs is required before these restorations can be recommended for general use.


Resin-bonded attachments RBAs, all-ceramic Fracture load Fatigue load Dye penetration Zirconia 



The authors acknowledge the support of this study by Bredent, Senden, Germany, by providing their material free of charge, as well as by Neue Zähne, Osnabrück, Germany, by manufacturing the zirconia restorations free of charge.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

For this type of study, formal consent is not required.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Prosthodontics, Propaedeutics and Dental Materials, School of DentistryChristian-Albrechts UniversityKielGermany
  2. 2.Institute of Medical Informatics and StatisticsChristian-Albrechts UniversityKielGermany

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