الفهرس 
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Abstract
تأثير فضة ديامين الفلورايد على قوة الربط لمينا سنَى منخفض التمعدن
(دراسة معملية)
As there is an increasing use of SDF for management of caries, the enamel margin of cavities may have been treated by SDF before placement of restoration. The resin restorations must bond to a tooth pre-treated with
38% SDF. This study was conducted to evaluate the influence of SDF application to sound and demineralized enamel on microshear bond strength of mild universal adhesive bonding in self-etch mode.
In total, 80 sound molars were prepared and molded then half of samples were immersed into lab made demineralizing solution to create enamel demineralization. All samples are divided into four groups according to enamel state of mineralization and surface treatment using SDF (20 specimen / group). group 1: Sound Enamel without SDF, group 2: Demineralized Enamel without SDF, group 3: Sound Enamel with SDF, group 4: Demineralized Enamel with SDF. SDF application followed by mild universal adhesive application in self-etch mode then injection of flowable composite into plastic mold with 1 ml in diameter. Microshear bond strength was measured using Universal testing machine. Means and Standard deviation for each group were calculated. Statistical analysis was performed using SPSS statistical analysis program for Windows (version 21.0). Statistical analysis was performed using Two- way analysis of variance (ANOVA) at P ≤ 0.05 and One-Way ANOVA/ Tukey’s HSD post hoc test.
Results revealed that group 1 and group 4 have highest microshear bond strength values to enamel with no statistically significant difference between them. while group 3 and group 2 have lowest
Summery and conclusion
microshear bond strength values to enamel with no statistically significant difference between them.
It revealed that regardless the meniralization state of the substrate, different surface treatments used have no statistically significant effect on the microshear bond strength to enamel (P = 0.451). Regardless the surface treatments used, Enamel substrate mineralization shave no statistically significant effect on microshear bond strength (P =0.826). The interaction between surface treatment and substrate have statistically significant effect on the microshear bond strength to enamel (P = 0.002).
Conclusion
Under limitations of this study, the following conclusion could be suggested:
1- The application of SDF is beneficial in enhancing microshear bond strength of resin composite to demineralized enamel.
2- Mild universal adhesive in self etch mode is not the mode of choice in case of bonding resin composite to demineralized enamel without SDF as well as to sound enamel treated with SDF.
Clinical Recommendation
SDF should be confined to be applied on demineralized enamel in case of using mild universal adhesives in self etch mode.
Further investigations are needed to measure the effect of SDF
application on microshear bond strength of demineniralized enamel in case of using mild universal adhesives in etch and rinse mode.