Marginal adaptation of lithium disilicate ceramic crowns cemented with three different resin cements

  • Ingrid Peroz
  • Triantafyllos Mitsas
  • Kurt Erdelt
  • Niko Kopsahilis
Original Article
  • 7 Downloads

Abstract

Objectives

The cementation process and cementation materials have an influence on the marginal adaptation of restorations. The gap could be affected by thermal and mechanical loading (TCML). The computerized x-ray microtomography (μCT) method offers the possibility of measuring the marginal gap without destruction of the restoration. The aim of this study was to evaluate the marginal gap (MG) and the absolute marginal discrepancy (AMD) before and after TCML.

Materials and methods

Thirty-nine human premolars were prepared for full ceramic crowns made of lithium disilicate. The crowns were cemented by three different resins—Panavia F 2.0, Variolink II, and Relyx Unicem. The MG and AMD were evaluated by μCT before and after TCML.

Results

Panavia F 2.0 had the lowest MG (before 118 μm–after TMCL 124 μm) and AMD (before 145 μm–after TMCL 154 μm), followed by Relyx Unicem (MG: before 164 μm–after TCML 155 μm; AMD: before 213 μm–after TMCL 209 μm) and Variolink II (MG: before 317 μm–after TMCL 320 μm; AMD: before 412 μm–after TMCL 406 μm). The differences were statistically significant before and after TCML. Rather than TCML, it appeared the resin cement was responsible for differences between the MG and AMD before and after TCML.

Conclusions

μCT is an accurate technique for assessing cemented restorations. Panavia F 2.0 has the lowest MG and AMD before and after TCML.

Clinical relevance

The resin material that features a three-step protocol (Variolink II) produced higher MG and AMG values than the Panavia or Relyx Unicem varieties with less or no intermediate steps at all.

Keywords

μCT Marginal gap Cementation Absolute marginal discrepancy Full ceramic In vitro 

Notes

Acknowledgements

We thank the software producer, SOFD, who supported this study by developing the evaluation software for the μCT scans free of charge, and the dental laboratory, Ruebeling and Klar, which supported our work by fabricating the all-ceramic crowns for free.

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, Gerodontology and Craniomandibular DisordersCharité – Universitätsmedizin BerlinBerlinGermany
  2. 2.Prodontos Dental clinicBerlinGermany
  3. 3.Department of Prosthodontics, Gerodontology and Craniomandibular DisordersCharité – Universitätsmedizin BerlinBerlinGermany
  4. 4.Department of ProsthodonticsDental School of the Ludwig-Maximilians UniversityMunichGermany

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