Effect of Different Mouthwashes on the Surface Microhardness and Color Stability of Dental Nanohybrid Resin Composite

Abstract

Background: Surface microhardness and color stability of dental restorative material should be sustained throughout its functional lifetime to maintain the esthetic quality of the restoration. However, the frequent application of mouthwash may affect their surface microhardness and color stability. The aim of this study was to evaluate the effects of different types of mouthwashes with different contents on surface microhardness and color stability of dental nanohybrid resin-based composite. Methods: Disc specimens of nanohybrid resin composite (Luna Nano-Hybrid Composite) were prepared according to manufacturing instructions; specimens were incubated for 24 h in three types of mouthwash (Chlorohexidine, Listerine Green Tea, and Colgate Optic White Whitening Mouthwash). Artificial saliva was used as a control group. Surface microhardness was evaluated using Vickers microhardness device. Color stability after and before immersion in the different mouthwashes was evaluated using extra-oral spectrophotometer; the values of color change (ΔE00) were subsequently calculated. Data were analyzed using one-way ANOVA and post hoc test (p ≤ 0.05). Results: There was no significant difference between microhardness of resin composite immersed in artificial saliva, CHX, and Green Tea mouthwashes (78.5, 78.4, and 73.5, respectively) (p ≥ 0.1), while the bleaching mouthwash led to the lowest microhardness of resin composite, with significant difference compared to the three previous immersion media (p = 0.002). Moreover, there were significant differences in the color changes (ΔE00) of resin composite exposed to the various immersion media (p = 0.0001). Conclusions: The bleaching mouthwash led to a significant reduction in nanohybrid resin composite’s microhardness compared to the chlorohexidine and Green Tea containing mouthwashes. The resin composite’s color change was accepted in bleaching mouthwash but unaccepted in chlorohexidine and Green Tea containing mouthwashes.

The Effect of Repolishing on Surface Roughness of Hybrid Ceramics after Immersion in Mouth Rinse

“…[17] Also, the current study in accordance with Hamdy TM et al who studied the effect of different mouthwashes on the surface microhardness and color stability of dental nanohybrid resin composite and found that mouthwashes chemical composition had a strong effect on the surface hardness of resin composite materials. [22] The results of current study disagreed with Bohner et al who evaluated the surface roughness of resin composite and ceramic material after immersion in mouthwashes and concluded that mouthwashes did not have signi cant change in surface roughness of composite resin and ceramic materials. [23] Repolishing is critical for smooth surface, less plaque retention, facilitates hygiene, more esthetic, decrease tissue in ammation and comfortable surface of restoration.…”

Impact of acidic beverages on esthetic restorations concerning microhardness and color stability: a comparative assessment

“…The statistical difference between the three groups was substantial, and the p-value was 0.001. These results were in agreement with the studies of Hamdy et al (2023) and Abdallah et al (2021), where authors in their findings reported that pH largely affects the solubility and hardness of different esthetic restorative materials with different filler sizes.…”

Effect of whitening concepts on surface roughness and optical characteristics of resin‐based composites: An AFM study

“…Consistent with the results of this study, a systematic review stated that color change after treatment with mouthwashes was considered clinically acceptable (de Morais Sampaio et al, 2021). A study comparing the color stability of nanohybrid composites after treatment with different mouthwashes (Chlorohexidine, Listerine Green Tea, and Colgate Optic White Whitening Mouthwash), reported an acceptable color change in specimens treated with the mouthwash containing a whitening component (Hamdy et al, 2023).…”

“…Solidex finishing and polishing kit (Shofu Inc., Kyoto, Japan) was used for SDX specimens. Finally, the specimens were post-polymerized in distilled water at 37 C for 24 h (Hamdy et al, 2023).…”