Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Pedodontics

Objective: The current study investigated the effect of using antibacterial MDPB containing and/or fluoride releasing self-etch adhesive systems on early bond strength and sealing ability of composite restoration to primary tooth dentin. Four self-etch adhesive systems; from the same manufacturer, were used: two; two-step (Fluoride-free adhesive [Clearfil SE Bond] and antibacterial MDPB containing and fluoride-releasing adhesive [Clearfil Protect Bond]) and two; one-step (Fluoride-free adhesive [Clearfil S3 Bond] and fluoride-releasing adhesive [Clearfil S3 Bond Plus]). Resin- dentin interface of these adhesives was also investigated. Results: In results, the microshear bond strength varied from 24.5 )±6.65( MPa for the fluoride-free two-step adhesive to 17.08 (±3.7) MPa for the antibacterial fluoride-releasing two-step adhesive, the latter being the only one that showed significantly lower bond strength value compared to the fluoride-free two-step and the fluoride-releasing one-step adhesives. On the other hand, there was no statistically significant difference in the degree of microleakage comparing the fluoride-free and fluoride-releasing adhesives. However, the sealing ability of two-step adhesives was better than one-step adhesive systems. SEM showed hybrid layer and resin tag formations in groups of mild two-step adhesives, whereas with milder one- step adhesives; their interaction with the underlying dentin was rather superficial with little or no resin tag formation.

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