Influence of biofilm formation on the optical properties of novel bioactive glass-containing composites

Abstract

Objective Bioactive glass (BAG) has been suggested as a possible additive for dental restorative materials because of its antimicrobial effect and potential for promoting apatite formation in body fluids. The purpose of this study was to investigate the effects of bacterial biofilm on the change of colorimetric value and translucency of novel BAG-containing composites having different initial surface roughness. Methods Composites with 72 wt% total filler load were prepared by replacing 15% of the silanized Sr glass with BAG (65 mole% Si; 4% P; 31% Ca), BAG-F (61% Si; 31% Ca; 4% P; 3% F; 1% B), or silanized silica. Light-cured discs of 2-mm thickness (n=10/group) were divided into 4 different surface roughness subgroups produced by wet polishing with 600 and then up to 1200, 2400, or 4000 grit SiC. CIE L*a*b* were measured and the color difference and translucency parameter (TP) were calculated before and after incubating in media with or without a S. mutans (UA 159) biofilm for 2 wks (no agitation). Results were analyzed using ANOVA/Tukey's test (α = 0.05). Results All the color differences for BAG and BAG-F composite showed significant decreases with bacterial biofilm compared to media-only. The mean TP (SD) of BAG and BAG-F composite before aging [10.0 (2.8) and 8.5 (1.4)] was higher than that of the control composite [4.9 (0.8)], while the change in TP with aging was greater compared to the control with or without bacteria. BAG-F composites with the smoothest surfaces showed a greater decrease in TP under bacterial biofilm compared to the BAG composite. Significance Highly polished dental composites containing bioactive glass additives may become slightly rougher and show reduced translucency when exposed to bacterial biofilms, but do not discolor any more than control composites that do not contain the BAG.

Addition of antibacterial agent effect on color stability of composites after immersion of different beverages

“…When the composite groups were compared, the BAG group showed the greatest color change after immersion for 1, 7, and 30 days. Similar to our findings, Hyun et al reported that color changes were higher in a BAG group as compared with those in a BAG‐Flor group . Previous research showed that BAG released calcium ions during dissolution, which elevated the pH of interfacial solutions and prevented the attachment and growth of microorganisms .…”

“…Similar to our findings, Hyun et al reported that color changes were higher in a BAG group as compared with those in a BAG-Flor group. 29 Previous research showed that BAG released calcium ions during dissolution, which elevated the pH of interfacial solutions and prevented the attachment and growth of microorganisms. 30 Other research demonstrated that the acid produced by bacteria can cause superficial hydrolysis and degradation, possibly followed by slight penetration by staining agents and reactions with the superficial layer of composites.…”

A review of bioceramics-based dental restorative materials

“…BAG Among bioceramics, BAG is a relatively new material which has been incorporated into dental resin composites and adhesives. A total 20 studies [92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111] was found as per the inclusion criteria, whereby seven studies 92,[94][95][96]98,106,108) were based on fluoride-based bioactive glass (F-BAG). Few studies showed doping of zinc 101,102,107) , silver 110) , and niobiophosphate 109) in BAG powders.…”

Effects of staining liquids and finishing methods on translucency of a hybrid ceramic material having two different translucency levels

“… 10 The translucency of dental restorations is also influenced by the type of dental materials. 13 14 15 16 17 18 19 20 Thus, the translucency of ceramics and composites is widely reported in the literature. It has been demonstrated that the translucency parameters of ceramic materials are better than composites.…”