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Impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin: an in vitro study

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Abstract

This study tested the impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin. Human teeth were prepared and randomly divided into six groups (N = 144, n = 24 per group). For each tooth, a zirconia crown was manufactured. The zirconia crowns were cemented with: (1) Panavia21 (PAN), (2) Panavia21 combined with Gluma Desensitizer (PAN-G), (3) RelyX Unicem (RXU), (4) RelyX Unicem combined with Gluma Desensitizer (RXU-G), (5) G-Cem (GCM) and (6) G-Cem combined with Gluma Desensitizer (GCM-G). The initial tensile strength was measured in half (n = 12) of each group and the other half (n = 12) subjected to a chewing machine (1.2 Mio, 49 N, 5°C/50°C). The cemented crowns were pulled in a Universal Testing Machine (1 mm/min, Zwick Z010) until failure occurred and tensile strength was calculated. Data were analyzed with one-way and two-way ANOVA followed by a post hoc Scheffé test, t test and Kaplan–Meier analysis with a Breslow–Gehan analysis test (α = 0.05). After the chewing simulation, the self-adhesive resin cements combined with Gluma Desensitizer showed significantly higher tensile strength (RXU-G, 12.8 ± 4.3 MPa; GCM-G, 13.4 ± 6.2 MPa) than PAN (7.3 ± 1.7 MPa) and PAN-G (0.9 ± 0.6). Within the groups, PAN, PAN-G and RXU resulted in significantly lower values when compared to the initial tensile strength; the values of all other test groups were stable. In this study, self-adhesive resin cements combined with Gluma Desensitizer reached better long-term stability compared to PAN and PAN-G after chewing simulation.

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Acknowledgments

The materials were kindly provided by the respective manufacturers. Many thanks go to the Maintenance and Service Departement of the Center for Dental and Oral Medicine of the University of Zurich, especially Christian Lüscher for the production of the holding devices. The authors thank Albert Trottmann and Nicola Lanfranconi for dental technical support. We are grateful to Martina A. Schmid for the support in writing the manuscript.

Conflict of interest

The authors declare no conflicts of interest.

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Authors and Affiliations

  1. Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland

    Bogna Stawarczyk, Mutlu Özcan, Irena Sailer & Christoph H. F. Hämmerle

  2. Private Practice, Oberlandstrasse 77, Uster, 8610, Switzerland

    Leonie Hartmann

  3. Private Practice, Via Centrala 1, Ilianz, 7130, Switzerland

    Rahel Hartmann

  4. University of Zurich, Division of Biostatistics, Institute of Social and Preventive Medicine, Hirschengraben 84, Zurich, 8001, Switzerland

    Malgorzata Roos

  5. Plattenstrasse 11, Zurich, 8032, Switzerland

    Andreas Ender

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  1. Bogna Stawarczyk
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Correspondence to Bogna Stawarczyk.

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Stawarczyk, B., Hartmann, L., Hartmann, R. et al. Impact of Gluma Desensitizer on the tensile strength of zirconia crowns bonded to dentin: an in vitro study. Clin Oral Invest 16, 201–213 (2012). https://doi.org/10.1007/s00784-010-0502-y

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  • DOI: https://doi.org/10.1007/s00784-010-0502-y

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