الفهرس 
Title : Nano leakage of ormocer-based versus conventional etch and rinse adhesives under ormocer-based bulk-fill resin composite restoration : In vitro study
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Abstract
Aim: to assess the nanoleakage of ormocer-based composite resin using ormocer-based etch and rinse adhesive versus conventional one. Environmental Scanning Electron Microscope (ESEM) and image analysis by software were used to evaluate the tooth restoration interface. Materials and methods: A total 66 premolars were divided into two main groups according to type of adhesive system used either ormocer-based adhesive system or conventional one, each group was further divided into three subgroups according to storage time either 24 hours, one month or three months.1mm thick beams were prepared and immersed in the tracer solution. The resin-dentin interfaces were analyzed by an Environmental Scanning Electron Microscope (ESEM). Results: A non-significant difference in the nanoleakage between ormocer-based adhesive and conventional one for the 24 hours and three months storage time. However, significant difference between ormocer-based adhesive and conventional one for one month storage time where ormocer-based adhesive showed less nanoleakage.Conclusion: Tested adhesives showed good sealing ability after aging for three months; however, Ormocer containing adhesive performed better than that none containing over time with less linear gaps and silver impregnation