الفهرس 
ContentsOnly 14 pages are availabe for public view
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Abstract
Nanocomposites are relatively new composites consisting of filler particles in nanometric dimensions. Contamination of the dental operation area by saliva and other fluids is detrimental to positive restoration and should be controlled. Aim of this study Investigation of the microleakage of nano-adhesive after saliva contamination. Evaluation of interfacial micromorphology. Materials and Methods : One hundred and thirty five human primary molar teeth were collected ; cleaned and stored in 0.09% NaCl solution at 37 °C until usage. Standard class V cavities were prepared on the buccal surface of all teeth, teeth were randomly divided into 2 groups, control group (n=15) and contaminated group(n= 120). Teeth in contaminated group were divided into two groups according to the timing of contamination, group A at which saliva contamination after etching and group B, saliva contamination after adhesive application. Then each group was subdivided into 4 subgroups according to the methods of saliva contamination removal. Cavities were restored with Adper™ single 2 adhesive and Filtek™ Z350 XT. All specimens were thermocycled, immersed in 2% methylene blue dye for 24 hours at room temperature. All samples were sectioned faciolingually and analyzed for leakage using a stereomicroscope. Teeth were examined with a scanning electron microscope to evaluate interfacial micromorphology and marginal adaptation. Data was statistically analyzed using Chi-square test.Results : significant difference was observed between the control and contaminated groups, no significant difference was detected between control group and contaminated subgroups in occlusal, while there was a significant only among subgroups od B1 and B2 P 0.01 and B3 and B4 P 0.05 gingivally and subgroup A1(contaminated group) after etching, A2 contaminated after etching, B2 contaminated after adhesive, B4 contaminated after adhesive free from gaps. Conclusion : Saliva contamination after etching has no negative effect on composite microleakage and adaptation, while it had adverse effect after adhesive application. Significant higher gingival microleakage was recorded if saliva contamination occur after adhesive application.