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.
Statement of the problem: Clinical performance and survival rates of posterior high strength GICs are questionable. A new generation of conventional glass-ionomer restorative material (Ketac™ universal) without coating has been launched recently for restoring class I and II cavities without investigations. Objectives: This study was conducted to evaluate the mechanical properties of a new generation of conventional glass ionomer (Ketac™ universal) for restoring posterior stress bearing areas. Furthermore, the effectiveness of resin coating on Ketac™ universal GIC was evaluated. Materials and Methods: Three types of conventional glass ionomer restorative materials were selected for this study (Ketac™ Universal; KU, Ketac™ Molar; KM and Fuji IX GpFast; FIXF). Each GICs material specimens were prepared according to manufacturer' instructions and distributed randomly into two groups (N=30) (uncoated and coated groups) and then conditioned in distilled waterat 37 0 C for 24 hours. The flexural strength,compressive strength, and hardness tests for each material were evaluated using a universal testing machine. Furthermore, additional representative un-coated and coated specimens for each material were prepared for their characterization under scanning electron microscope. Data were analysed by multivariate ANOVA. Bonferroni post hoc test was used for multiple comparisons. Paired t-test was used to detect significant differences between un-coated and coated GICs. Interactions between GICs materials and coating were also performed. P-value is significant if it was less than .05. Results: The highest significant flexural strength, compressive strength and hardness values were noticed with Ketac universal and the lowest was noted with FIXF. Also, only significant improvement in the flexural and compressive strength of FIXF when resin coating was applied. Conclusions: KU represents an encouraging line of higher clinical longevity of GICs' filling material in stress bearing areas. Also the resin coating has no significant effect on the tested mechanical properties of KU GICs.
Coral calcium is a boasting natural product and dietary supplement which is considered a source of alkaline calcium carbonate, this study is a comparative study, comparing the remineraliztion effect of the new product of coral calcium with that of nano hydroxyapatite. Methodology: a total of 35 extracted molars were collected, examined and sectioned to obtain 70 sound enamel discs, all discs were numbered and examined by scanning electron microscope coupled with Energy Dispersive Analysis of X-rays(EDAX) for mineral content, subjected to artificial caries and mineral content was re measured, discs were divided into 7 groups according to the remineralizing agent used, where groups 1 to 3 used 10, 20, 30 % nanohydroxyapatite gel respectively, groups 4 to 6 used 10, 20, 30 % coral calcium gel and group 7 with no reminieralizing agent (control group). All groups were reexamined by EDAX after remineralization, data were calculated and tabulated. Results: all groups showed statistically significant drop in calcium level after artificial caries, all groups showed statistically significant rise in calcium content after re mineralization except for the control group, groups 1 and 5 showed the highest increase in calcium level after re mineralization. Conclusion: coral calcium can be considered a comparative product to nano hydroxyapatite regarding re mineralization of enamel initial carious lesions.
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