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Clinical Oral Investigations

, Volume 22, Issue 4, pp 1641–1649 | Cite as

Retention force of removable partial dentures with different double crowns

  • Christin ArnoldEmail author
  • Jeremias Hey
  • Jürgen M. Setz
  • Arne F. Boeckler
  • Ramona Schweyen
Original Article

Abstract

Objectives

The aim of the study was to compare the retentive behaviors of double crowns with different designs and material compositions before and after artificial aging.

Materials and methods

Six pairs of double crowns were fabricated: telescopic crowns 0° made of high-noble metal (group A) or non-precious metal (group B), telescopic zirconia copings with secondary crowns made of electroplated gold 2° (group C), crowns with friction pins 2° made of non-precious metal (group D) or zirconia (group E), and conical crowns 6° made of high-noble metal (group F). Retention forces were assessed before and after artificial aging, and after axial and non-axial loading.

Results

Initially, specimens in group D (13.9 N), B (12.5 N), and E (12.2 N) exhibited the highest retention forces. Retention forces in groups A (9.6 N), C (7.4 N), and F (6.0 N) were statistically significantly lower than those of the other groups (p < 0.05). After artificial aging, double crowns with additional retention elements exhibited the highest retention forces. The largest retention force losses were evident in groups A (70%), B (64%), C (39%), and F (47%).

Conclusions

Double crowns with different designs and made of different materials exhibited different retention forces and different long-term retentive behavior. The highest retention force losses were evident in double crowns with more extended surface contact, such as telescopic crowns.

Clinical significance

Telescopic crowns with additional retention elements were more resistant to wearing than double crowns without additional retention elements. An additional clinical benefit might be the quick and easy possibility of enhancing retention.

Keywords

Partial denture Double crowns Telescopic Friction Retention force Friction pins 

Notes

Funding

The work was supported by the Department of Prosthodontics, Martin-Luther-University Halle-Wittenberg, Germany.

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 2017

Authors and Affiliations

  • Christin Arnold
    • 1
    Email author
  • Jeremias Hey
    • 1
  • Jürgen M. Setz
    • 1
  • Arne F. Boeckler
    • 1
  • Ramona Schweyen
    • 1
  1. 1.Department of Prosthodontics, School of Dental MedicineMartin-Luther-UniversityHalleGermany

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