Effect of intraoral polishing on the surface property, phase change, and color stainability of monolithic zirconia

Statement of problem. How glazing and polishing affects the phase change and color stainability of monolithic zirconia restorations is unclear. Purpose. The purpose of this in vitro study was to investigate the phase changes and color stainability of monolithic zirconia after applying polishing systems and storage in different solutions. Material and methods. Sixty & Oslash;15x1.2 +/- 0.01-mm disks of 2 monolithic zirconia materials (Katana, GC Initial Zircon) were prepared, glazed, and assigned to 3 groups: A control group with no additional treatment after glaze; and 2 groups in which the glaze layer was removed and the surfaces polished using 2 different polishing systems (OptraFine and Ceramiste Shofu). One specimen from each group was examined under a scanning electron microscope. All specimens were kept in solution (coffee and cola) for 28 days. Color differences were calculated using CIEDE 2000 (Delta E00), and phase change was analyzed with an X-ray diffractometer. Data were analyzed with ANOVA and Tukey post hoc tests (alpha=.05). Results. Material type had a significant effect on phase change (P=.012), and the Delta E00 values were significantly different between monolithic zirconia materials (P=.027). Katana had higher XM values than GC, while GC had higher Delta E00 values than Katana. Conclusions. Cola and coffee changed the color of zirconia materials. Although glaze was the most successful process, intraoral zirconia polishing kits also provided acceptable surface properties. (J Prosthet Dent 2025;133:1090.e1-e8)

Journal

JOURNAL OF PROSTHETIC DENTISTRY

Year

2025

Volume

133

Issue

4

Pages

1090e1-1090e8

ISSN

0022-3913

eISSN

1097-6841

DOI

10.1016/j.prosdent.2024.12.025

WoS UID

WOS:001468290100001