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CC BY 4.0 · Eur J Dent 2025; 19(01): 080-089
DOI: 10.1055/s-0044-1787001
Original Article

Effect of Grinding and Polishing Protocols on Surface Roughness, Flexural Strength, and Phase Transformation of High-Translucent 5 mol% Yttria-Partially Stabilized Zirconia

Autor*innen

  • Chatnarong Phatphutthitham

    1   Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand

  • Boondarick Niyatiwatchanchai

    1   Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand

  • Phakvalunch Rujiraprasert

    1   Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand

  • Junji Tagami

    2   Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, Thailand

  • Thanaphum Osathanon

    3   Center of Excellence for Dental Stem Cell Biology, Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand

  • Anucharte Srijunbarl

    4   Dental Material Research and Development Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand

  • Thawanrat Singthong

    4   Dental Material Research and Development Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand

  • Sarat Suriyasangpetch

    5   Department of Advanced General Dentistry, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.

  • Dusit Nantanapiboon

    1   Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
    4   Dental Material Research and Development Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
    6   Clinic of General, Special Care, and Geriatric Dentistry, Center for Dental Medicine, University of Zurich, Zurich, Switzerland

Funding The work was supported by the Faculty of Dentistry, Chulalongkorn University (grant number DRF66027).
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Abstract

Objectives This study evaluated surface roughness, biaxial flexural strength, and phase transformation of 5Y-PSZ after grinding and polishing with different protocols.

Material and Methods Two commercial 5Y-PSZ, Lava Esthetic (L) and Cercon xt (C), were used and divided into 3 groups: LC and CC represented unpolished control groups; LE and CE were polished with protocol I (EVE DIASYNT® PLUS HP following with EVE DIACERA RA); and LJ and CJ were polished with protocol II (Superfine diamond bur following with Jota ZIR Gloss polishing kit). Surface roughness was evaluated after polishing step-by-step with a contact-type profilometer. After high-gross polishing, the specimens were subjected to biaxial flexural strength test, crystallographic microstructure analysis using an X-ray diffractometer (XRD), and surface micro-topography using scanning electron microscopy (SEM).

Statistical Analysis Surface roughness differences after each step and biaxial flexural strength between groups were evaluated with one-way ANOVA, followed by Bonferroni post-hoc analysis. Changes in surface roughness across four different time points within groups were assessed using one-way repeated measures ANOVA, followed by Bonferroni post-hoc analysis.

Results After high-gross polishing, both polishing protocols showed significantly lower surface roughness than the grinding group (p < 0.05). The LE and CE groups exhibited the highest surface roughness values, which were significant differences from the LJ and CJ groups (p < 0.05). The LE group showed significantly lower biaxial flexural strength compared to the LC group (p < 0.05). However, there was no statistically significant difference in the CE and CJ groups compared to the control group (p > 0.05). Furthermore, all polishing protocols did not change the phase transformation of zirconia.

Conclusion Polishing protocol II provided a smoother surface than the protocol I after high-gross polishing, while the biaxial flexural strength of materials remained unaffected.

Keywords

zirconia - 5Y-PSZ - surface roughness - biaxial flexural strength


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Artikel online veröffentlicht:
28. Juni 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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