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. 2018 Jun 18;11(6):1031.
doi: 10.3390/ma11061031.

Properties of Experimental Dental Composites Containing Antibacterial Silver-Releasing Filler

Robert Stencel  1 , Jacek Kasperski  2 , Wojciech Pakieła  3 , Anna Mertas  4 , Elżbieta Bobela  5 , Izabela Barszczewska-Rybarek  6 , Grzegorz Chladek  7
Affiliations

Properties of Experimental Dental Composites Containing Antibacterial Silver-Releasing Filler

Robert Stencel et al. Materials (Basel). .

Erratum in

Abstract

Secondary caries is one of the important issues related to using dental composite restorations. Effective prevention of cariogenic bacteria survival may reduce this problem. The aim of this study was to evaluate the antibacterial activity and physical properties of composite materials with silver sodium hydrogen zirconium phosphate (SSHZP). The antibacterial filler was introduced at concentrations of 1%, 4%, 7%, 10%, 13%, and 16% (w/w) into model composite material consisting of methacrylate monomers and silanized glass and silica fillers. The in vitro reduction in the number of viable cariogenic bacteria Streptococcus mutans ATCC 33535 colonies, Vickers microhardness, compressive strength, diametral tensile strength, flexural strength, flexural modulus, sorption, solubility, degree of conversion, and color stability were investigated. An increase in antimicrobial filler concentration resulted in a statistically significant reduction in bacteria. There were no statistically significant differences caused by the introduction of the filler in compressive strength, diametral tensile strength, flexural modulus, and solubility. Statistically significant changes in degree of conversion, flexural strength, hardness (decrease), solubility (increase), and in color were registered. A favorable combination of antibacterial properties and other properties was achieved at SSHZP concentrations from 4% to 13%. These composites exhibited properties similar to the control material and enhanced in vitro antimicrobial efficiency.

Keywords: antibacterial properties; color stability; degree of conversion; dental composites; mechanical properties; silver; solubility; sorption.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Scanning electron microscopy images presenting the morphologies of used fillers: glass fillers with a mean particle size of 0.7 μm (a); 2 μm (b); silica nanofiller (c); and silver sodium hydrogen zirconium phosphate (d,e).
Figure 2
Figure 2
Representative SEM images presenting the morphologies of the cured base composite compounded with: reinforcing fillers (a,b); addition of 7% (c) and 16% (c–f) of silver sodium hydrogen zirconium phosphate; (a–d)—wet-ground, polished, etched samples (e,f)—frozen-broken but not etched samples, black arrows (c,d) indicate the gaps between SSZHP and matrix after etching.
Figure 3
Figure 3
Mean values and standard deviations of compressive strength.
Figure 4
Figure 4
Mean values and standard deviations of diametral tensile strength.
Figure 5
Figure 5
Mean flexural strength (a) and flexural modulus (b) values with standard deviations; different lowercase letters show significantly different results at the p < 0.05 level.
Figure 6
Figure 6
Mean Vickers microhardness values with standard deviations; different lowercase letters show significantly different results at the p < 0.05 level.
Figure 7
Figure 7
Mean degree of conversion values with standard deviations at the top (a); and at the bottom (b) of the samples, different lowercase letters show significantly different results at the p < 0.05 level.
Figure 8
Figure 8
Mean values with standard deviations of sorption (a); and solubility (b), different lowercase letters show significantly different results at the p < 0.05 level.
See this image and copyright information in PMC

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