Research Article
Volume 19 Issue 1 - 2020
Color Stability and Microhardness of Nanocomposite Resins Exposed to Different Staining Solutions: In Vitro Study
Sultan Saleh AlShamrani1*, Mohamed I Hashem2, Mansour K Assery3 and Ahoud Saleh Alshamrani4
1Lecturer, Department of Restorative Dentistry, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia
2Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
3College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia
4Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
*Corresponding Author: Sultan Saleh AlShamrani, Lecturer, Department of Restorative Dentistry, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia.
Received: December 04, 2019; Published: December 30, 2019


Background: Nanotechnology revolutionized the dental field through the development of resin materials with more suitable mechanical properties. However, the main disadvantage of composite restoration is discoloration to upon prolonged exposure to oral environments. The color stability and microhardness values of three nanocomposite resins immersed in different staining solutions were investigated. 

Materials and Methods: A total of 45 disc-shaped specimens (12.0 mm × 2.0 mm) were prepared from three nanocomposites (Filtek Z350, Filtek Bulk Fill, and Grandio; fifteen specimens per material). Each group was then randomly subdivided into three groups according to staining solutions; immersed in artificial saliva (control group), Arabic coffee, and Coca Cola (n = 5). The microhardness and colors measurement of the composite specimens were measured at baseline and after 7, 14, 21 and 28 days of immersion in staining solutions. The data analyzed using analysis of variance and Tukey’s multiple comparison tests at significance level p < 0.05.

Results and Conclusion: Significant differences were found in the color measurement values (∆Eab) of the three brands of composite after 28 days of staining procedure. Filtek Z350 (1.38 ± 0.09) significantly differed from Filtek Bulk Fill (0.95 ± 0.01) and Grandio (1.09 ± 0.06). The specimens immersed in cola exhibited the most significant color changes compared to saliva and coffee.

Similar significant differences were observed in the hardness of the three types of specimens. The highest hardness value was observed for Grandio (96.60 ± 1.51), followed by Filtek Z350 (72.13 ± 2.10) and Filtek Bulk Fill (53.19 ± 1.83) (P < 0.05) at the baseline. The specimens immersed in saliva (control) exhibited increased hardness after 28 days of immersion, whereas the specimens stored in coffee and cola exhibited decreased hardnesses.

The nanocomposites investigated in the present study exhibited significant color changes upon immersion in Coca Cola solution for 28 days. Similarly, the micro-hardness values of Filtek Z350 and Filtek Bulk fill decreased after immersion in the tested staining solutions. 

Keywords: CIELAB; Color Stability; Composite Resins; Microhardness; Nanocomposite


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Citation: Sultan Saleh AlShamrani., et al. “Color Stability and Microhardness of Nanocomposite Resins Exposed to Different Staining Solutions: In Vitro Study”. EC Dental Science 19.1 (2020): 01-13.

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