Retention and surface changes of zirconia primary crowns with secondary crowns of different materials

Işıl Turp*, Ergün Bozdağ, Emin Sünbüloğlu, Cem Kahruman, İbrahim Yusufoğlu, Gülsen Bayraktar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Objectives: To evaluate zirconia as a substitute for gold alloy in primary crowns facing secondary crowns manufactured with different materials, in terms of long-term retention force changes, wear, and phase transformation was aimed.Materials and Methods: A total of 12 groups, each containing six samples, consisting of gold alloy primary crown-electroformed gold secondary crowns (AA), zirconia primary crown-electroformed gold secondary crowns (ZA) and zirconia primary crown-casted non-precious alloy secondary crowns (ZC) with conus angles of 0°, 2°, 4°, and 6° were evaluated. Samples were subjected to 10,000 insertion–separation cycles in artificial saliva and retention force was measured. X-ray diffraction and scanning electron microscope analysis were performed on the sample surfaces.Results: The highest retention forces were obtained from ZC-0° group (72.09–71.26 N) and the lowest were obtained from ZA-4° (12.73–19.44 N) and ZA-6° (5.36–19.73 N) groups in the beginning and after 10,000 cycles, respectively. Retention force increased as the conus angle decreased. The monoclinic phase ratio of the zirconia primary crowns decreased after the experiments. No wear was observed in zirconia primary crowns except for the ZC-0° and ZC-2° groups. The use of zirconia primary crowns resulted in a less excursive retention force.Conclusions: A more predictable and less excursive retention force can be obtained using a hard and rigid primary crown material like zirconia.Clinical Relevance: Despite a lack of knowledge about the aging of zirconia without a veneer layer in the oral environment, zirconia primary crowns are more advantageous in terms of retention force development and wear.

Original languageEnglish
Pages (from-to)2023-2035
Number of pages13
JournalClinical Oral Investigations
Volume18
Issue number8
DOIs
Publication statusPublished - Nov 2014

Bibliographical note

Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.

Funding

This study was supported by the Research Fund of Istanbul University. Project No. 4086. The authors thank Metin Ulutag and other Atak Dental laboratory staff for their meticulous work in preparing the test samples, Metalor Dental for the donation of the gold alloy the primary crowns are made of, Eve Ernst Vetter GmbH for donation of the zirconia polishers and Siladent Dr. Böhme & Schöps GmbH for the donation of the investment materials.

FundersFunder number
Istanbul Üniversitesi4086

    Keywords

    • Double crown
    • Retention force
    • Wear
    • X-ray diffraction
    • Zirconia

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