Warsaw Medical University in Poland, Poland.

Speech Title: The laboratory comparison of shear bond strength and microscopic assessment of failure modes for a glass-ionomer cement and dentin bonding systems combined with silver nanoparticles
Abstract: Dental caries is the most frequent oral disease worldwide. Due to the restorative materials’ technical imperfections and bacterial microleakage, more than half of the cavity restorations are replaced shortly after placement. Therefore, the need for disinfection agents, such as silver nanoparticles (AgNPs), arises. The aim of the study was to assess the shear bond strength (SBS) to dentin and failure modes of restorations performed using different dental materials (total-etch bonding system, self-etch bonding system and glass-ionomer cement) and followed by AgNPs application. Forty-two non-carious extracted human third molars were used and the study comprised the SBS test followed by thermocycling used for an artificial ageing of the fillings, SEM/FIB, SEM/EDX and endodontic microscope evaluations. The results showed no impact of AgNPs addition to dental materials in terms of SBS to dentin. A change of the failure mode of the self-etch bonding system combined with AgNPs was observed, which may have a serious clinical impact. Also, the AgNPs were seen to be gathered in larger agglomerations in the dentin-adhesive border zone. The study was supported by grant WUM 1S17/PM51D/14 founded by Warsaw Medical University, Warsaw, Poland. The study was published in Acta of Bioengineering and Biomechanics, DOI: 10.5277/ABB-00441-2015-02.
Keywords: silver nanoparticles, adhesive systems, glass-ionomer cement, shear bond strength, failure modes