Effect of Different Surface Finishing Processes on the Optical Properties of Zirconium Oxide Ceramics

Öz

Abstract Objective: Zirconium oxide ceramics are widely used in dentistry due to their excellent mechanical and aesthetic properties. This study investigated the optical properties of zirconium oxide specimens applied with different surface finishing processes Materials and Methods: The study was conducted under in vitro conditions. Thirty zirconium oxide discs (diameter = 15 mm, thickness = 1.2 ± 0.2 mm) were produced and randomly divided into three groups: glazing (Control, Group C), grinding and polishing with EveDiacera (Group L), and grinding and polishing with a polishing paste (Group P). L, a*, and b* values were measured with a spectrophotometer, and color difference (ΔE00), translucency parameter (TP), whiteness index (WI), and modified metameric index (M-MI) were calculated. Data were analysed using ANOVA, Tukey HSD, paired t-tests, and Mann-Whitney U tests (p<0.05). Results: The mean ΔE00 values were 2.04 for Group C, 2.15 for Group P, and 1.81 for Group L. No significant differences were observed in ΔE00 among the groups (p>0.05). Post-treatment TP values significantly decreased in Groups P and L (p<0.001), and a significant difference was found between Group C and Group L (p=0.0017). WI values did not differ significantly between groups (p>0.05), although Group L showed a significant reduction after treatment (p=0.036). No significant differences in M-MI were observed under 4200K (p=0.112) or 5000K (p=0.325) illumination. Conclusion: Different surface finishing processes affect the translucency and whiteness of zirconia, while metamerism remained unaffected under various lighting conditions.

Anahtar Kelimeler

• Dental zirconia
• metamerism
• optical properties
• translucency
• whiteness index

Farklı Yüzey Bitirme İşlemlerinin Zirkonyum Oksit Seramiklerin Optik Özellikleri Üzerindeki Etkisi

Öz

Amaç: Zirkonyum oksit seramikler, mükemmel mekanik ve estetik özellikleri nedeniyle diş hekimliğinde yaygın olarak kullanılmaktadır. Bu çalışmada, farklı yüzey bitirme işlemleri uygulanmış zirkonyum oksit örneklerinin optik özellikleri incelenmiştir. Materyal ve Metot: Çalışma in vitro koşullarda gerçekleştirilmiştir. Otuz adet zirkonyum oksit disk (çap = 15 mm, kalınlık = 1,2 ± 0,2 mm) üretilmiş ve rastgele üç gruba ayrılmıştır: glaze uygulanmış grup (Kontrol, Grup C), EveDiacera ile taşlama ve polisaj yapılan grup (Grup L) ve taşlama ve polisaj pastası yapılan grup (Grup P). L, a ve b değerleri spektrofotometre ile ölçülmüş; renk farkı (ΔE00), yarı saydamlık parametresi (TP), beyazlık indeksi (WI) ve modifiye metamerik indeks (M-MI) hesaplanmıştır. Veriler ANOVA, Tukey HSD, eşleştirilmiş t-testi ve Mann-Whitney U testleri ile analiz edilmiştir (p<0,05) Bulgular: Ortalama ΔE00 değerleri Grup C için 2,04, Grup P için 2,15 ve Grup L için 1,81 olarak bulunmuştur. Gruplar arasında ΔE00 açısından anlamlı bir fark gözlenmemiştir (p>0,05). İşlem sonrası TP değerleri Grup P ve Grup L’de anlamlı şekilde azalmış (p<0,001) ve Grup C ile Grup L arasında anlamlı bir fark bulunmuştur (p=0,0017). WI değerleri gruplar arasında anlamlı farklılık göstermemiştir (p>0,05), ancak Grup L’de işlem sonrası anlamlı bir azalma görülmüştür (p=0,036). M-MI değerlerinde ise 4200K (p=0,112) veya 5000K (p=0,325) aydınlatma altında anlamlı bir fark gözlenmemiştir. Sonuç: Farklı yüzey bitirme işlemleri, zirkonyanın yarı saydamlığını ve beyazlığını etkilerken, çeşitli aydınlatma koşullarında metamerizm etkilenmemiştir.

Anahtar Kelimeler

• Beyazlık indeksi
• dental zirkonya
• metamerizm
• optik özellikler
• yarı saydamlık

Kaynakça

1. 1. Kim HK, Kim SH, Lee JB, Ha SR. Effects of surface treatments on the translucency, opalescence, and surface texture of dental monolithic zirconia ceramics. J Prosthet Dent. 2016;115(6):773-779. doi:10.1016/j.prosdent.2015.11.020
2. 2. Amaya-Pajares SP, Ritter AV, Vera Resendiz C, et al. Effect of finishing and polishing on the surface roughness of four ceramic materials after occlusal adjustment. J Esthet Restor Dent. 2016;28(6):382-396. doi:10.1111/jerd.12222
3. 3. Vila-Nova TEL, de Carvalho IHG, Moura DMD, et al. Effect of finishing/polishing techniques and low temperature degradation on the surface topography, phase transformation and flexural strength of ultra-translucent ZrO2 ceramic. Dent Mater. 2020;36(4):e126-e139. doi:10.1016/j.dental.2020.01.014
4. 4. Kim HK, Kim SH, Lee JB, Han JS, Yeo IS. Effect of polishing and glazing on the color and spectral distribution of monolithic zirconia. J Adv Prosthodont. 2013;5(3):296-304. doi:10.4047/jap.2013.5.3.296
5. 5. Ozen F, Demirkol N, Oz OP. Effect of surface finishing treatments on the color stability of CAD/CAM materials. J Adv Prosthodont. 2020;12(3):150-157. doi:10.4047/jap.2020.12.3.150
6. 6. Kanat-Ertürk B. Farklı yüzey bitirme prosedürleri ile hazırlanan CAD/CAM seramiklerinin renk stabilitesi. J Prosthodont. 2020;29(2):166-172. doi:10.1111/jopr.13019
7. 7. da Silva AO, Fiorin L, Faria ACL, et al. Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging. Sci Rep. 2022;12:16094. doi:10.1038/s41598-022-20120-y
8. 8. Sen N, Us YO, Tuncelli B, Goller G. Mechanical and optical properties of monolithic CAD-CAM restorative materials. J Prosthet Dent. 2018;119(4):593-599. doi:10.1016/j.prosdent.2017.05.004

9. 9. Hein S, Westland S. Illuminant metamerism between natural teeth and zirconia restorations evaluated with a chromatic adaptation transform. J Prosthet Dent. 2024;132(5):1020-1027. doi:10.1016/j.prosdent.2023.07.002
10. 10. Güven ME, Kara Ö. The metameric effect of monolithic zirconias with varying yttrium ratios. J Adv Prosthodont. 2024;16(1):48-56. doi:10.4047/jap.2024.16.1.48
11. 11. Hashemikamangar SS, Nahavandi AM, Daryadar M, Valizadeh S, Özcan M. Effect of glazing and polishing on opalescence and fluorescence of dental ceramics. Clin Exp Dent Res. 2022;8(6):1645-1654. doi:10.1002/cre2.666
12. 12. Saker S, Özcan M. Effect of surface finishing and polishing procedures on color properties and translucency of monolithic zirconia restorations at varying thickness. J Esthet Restor Dent. 2021;33(6):953-963. doi:10.1111/jerd.12782
13. 13. Silva SEG D, Silva BCD D, Crispim AHT, et al. Effect of different finishing/polishing techniques and glaze application on the flexural strength of ultratranslucent zirconia after hydrothermal aging. J Mech Behav Biomed Mater. 2025;164:106924. doi:10.1016/j.jmbbm.2025.106924
14. 14. Phatphutthitham C, Niyatiwatchanchai B, Rujiraprasert P, et al. Effect of grinding and polishing protocols on surface roughness, flexural strength, and phase transformation of high-translucent 5 mol% yttria-partially stabilized zirconia. Eur J Dent. 2024;17:1-9. doi:10.1055/s-0044-1788938
15. 15. Vohra M, Pandurangan KK, Shenoy A, Keskar V. A comprehensive review of the surface and chromatic properties of monolithic zirconia: evaluating the impact of polishing and finishing methods on aesthetics and performance. Cureus. 2024;16(8):e66006. doi:10.7759/cureus.66006
16. 16. Lee YK, Lim BS, Kim CW. Effect of surface conditions on the color of dental resin composites. J Biomed Mater Res. 2002;63(5):657-663. doi:10.1002/jbm.10383
17. 17. International Organization for Standardization. ISO 6872: Dentistry—Ceramic Materials. Geneva: ISO; 2015.
18. 18. Özdemir B, Karadeniz BKK, Özdemir SB, Akbulut Ö. How the translucency and color stability of single-shade universal resin composites are affected by coffee. Curr Res Dent Sci. 2024;34(4):270-275. doi:10.4274/crds.2024.98206
19. 19. Fidan M, Yağcı O. Effect of surface sealant on the color stability and whiteness index of single-shade resin composites after staining and bleaching. Restor Dent Endod. 2024;49(3):e30. doi:10.5395/rde.2024.49.e30
20. 20. Corcodel N, Kleverlaan CJ, Feilzer AJ, et al. Metameric effect between natural teeth and the shade tabs of a shade guide. Eur J Oral Sci. 2010;118(3):311-316. doi:10.1111/j.1600-0722.2010.00736.x
21. 21. Kim SH, Lee YK, Lim BS, Rhee SH, Yang HC. Metameric effect between dental porcelain and porcelain repairing resin composite. Dent Mater. 2007;23(3):374-379. doi:10.1016/j.dental.2006.01.029
22. 22. Ozdemir SB, Ozdemir B. The effect of thermal aging on the color matching of Class III and Class V restorations with universal resin composites in various-shade human teeth: an instrumental and visual evaluation. Clin Oral Investig. 2025;29(7):3601-3610. doi:10.1007/s00784-024-06062-9
23. 23. Tabatabaian F, Vora S, Mirabbasi S. Effects of ceramic shade, ceramic thickness, and surface treatment on the color match of high-translucency monolithic multilayer zirconia restorations. Int J Dent. 2025;2025:2004922. doi:10.1155/2025/2004922
24. 24. Yıldırım AZ, Sönmez A, Karagülleoğlu ZY, Duman AN. Effects of artificial aging process on color stability and translucency of monolithic zirconia. Selcuk Dent J. 2025;12(1):48-53.
25. 25. Arslan E, Değirmenci K. Effects of surface finishing methods, zirconia brands, and bleaching techniques on color change and translucency of monolithic zirconia restorations: a comparative study. Selcuk Dent J. 2025;12(1):71-79.
26. 26. Polychronakis N, Lagouvardos P, Polyzois G, Ngo HC. Intra- and inter-brand color differences of denture teeth under different illuminations. J Appl Oral Sci. 2020;28:e20190693. doi:10.1590/1678-7757-2019-0693