Abstract
The aim of this work was to study the physical and antibacterial properties of a flowable resin composite incorporating a sol-gel derived silver doped bioactive glass (Ag-BGCOMP). The depth of the cure was calculated by measuring the surface micro-hardness for the top and bottom surfaces. The volumetric polymerization shrinkage was measured by recording the linear shrinkage as change in length, while the biaxial flexural strength was studied measuring the load at failure. The antibacterial properties of the samples were tested against Streptococcus mutans (S. mutans) and Lactobacillus casei (L. casei). The measured values were slightly decreased for all tested physical properties compared to those of control group (flowable resin composite without Ag-BG), however enhanced bacteria inhibition was observed for Ag-BGCOMP. Ag-BGCOMP could find an application in low stress-bearing areas as well as in small cavity preparations to decrease secondary caries. This work provides a good foundation for future studies on evaluating the effects of Ag-BG addition into packable composites for applications in larger cavity preparations where enhanced mechanical properties are needed.
Highlights
Composite resins are recently considered the most commonly used tooth-colored intra-coronal restoration [1]
The control group had depth of cure ratio at 0.81 ± 0.06 just above the 0.8 acceptable ratio value, while the Ag-BGCOMP group had slightly less at 0.76 ± 0.02
The depth of cure ratio was found to be slightly lower for the Ag-BGCOMP compared to control; the difference is not considered clinically significant
Summary
Composite resins are recently considered the most commonly used tooth-colored intra-coronal restoration [1]. Several attempts have been made to overcome this problem by adding antimicrobial materials, such as fluoride and chlorhexidine to the resin matrix in order to prevent and hopefully eliminate recurrent decay and provide antimicrobial properties. These materials have not been widely used because of diminishing fluoride release and uptake with time, as well as their short-term effect [10,11]. In 2014, Kasraei tested the effect of adding 1% silver and 1% zinc-oxide nanoparticles into flowable composite, and resulted in a decrease in Streptococcus mutans and Lactobacillus reducing recurrent caries [14]
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