Effect of modified 45s5 bioglass on physical and chemical properties of bleached enamel

Abstract

Aim: The purpose of this study was to evaluate of the effects of modified 45S5 bioglass (BG) before, after, and during the bleaching procedure with 35% hydrogen peroxide (HP) on the tooth colour change and physicochemical and morphological properties of human enamel. Methods: Forty-two human premolar enamel samples were prepared and randomly divided into six groups as G1: control (deionized distilled water for 20 min), G2: BG (Bioglass suspension for 20 min), G3: HP (hydrogen peroxide 35% for 20 min), G4: BG before HP (Bioglass suspension for 20 min followed by hydrogen peroxide 35%) , G5: BG after HP (hydrogen peroxide 35% followed by Bioglass suspension for 20 min), and G6: BG during HP (Bioglass in hydrogen peroxide 35% suspension for 20 min). The treatment procedure was performed on the whole enamel surface. Colorimetry was done before and after the treatment procedure. Two specimens from each group were selected for morphological analysis with scanning electron microscope (SEM). Microhardness analysis was performed after the treatment procedure and chemical analysis of BG dissolution was done for BG+DDW and BG+HP suspensions. Results: No statistically significant difference in colour was observed among different groups (P= 0.073133) and the yellowness index decreased in all of the four HP groups. The greatest reduction in microhardness occurred in groups HP and BG before HP (P<0.001) while the BG group showed increased microhardness measurements (P<0.001). Statically significant differences in microhardness were found among the groups. Elemental analysis showed significantly increased levels of Ca and P in BG after HP and BG before HP groups when compared to the HP group. Ionic release of BG was significantly greater in HP when compared to DDW. Conclusion: Using BG before HP had a greater protective effect since it increased microhardness more effectively, decreased mineral loss, and retained the integrity of the enamel surface. The HP group had the lowest microhardness and BG during HP showed less protective effects compared to BG before HP.

In Vitro Enamel Remineralization Efficacy of Calcium Silicate-Sodium Phosphate-Fluoride Salts versus NovaMin Bioactive Glass, Following Tooth Whitening

“…22,23 The EDX elemental analysis (►Table 4) revealed a significant reduction in the Ca/P ratio of the bleached enamel in comparison to the baseline readings, which in agreement with the findings of several previous studies. 24,25 The application of CSSPF showed a significant increase in microhardness compared with values obtained after bleaching. This finding is consistent with other investigations; an in situ study by Joiner et al placed acid-challenged tooth enamel inserts onto patients' partial dentures.…”

Effect of bioactive glass paste on efficacy and post-operative sensitivity associated with at-home bleaching using 20% carbamide peroxide: a randomized controlled clinical trial

“…Several in vitro studies demonstrated that the application of BAG either before, after or during teeth bleaching did not negatively affect the bleaching efficacy. Moreover, this association exhibited many benefits including, reduced mineral degradation [ 47 , 48 ], reduced losing of enamel microhardness [ 49 , 50 ], conserved enamel surface integrity [ 50 , 51 ] and minimized the infiltration of peroxides into pulp chambers [ 52 ].…”

Effect of bleaching treatment on element content of enamel

“…In the study of Saffarpour and co-workers, 26 a Sr-based agent was applied to all samples and bleaching treatment was applied to only one group. According to the obtained data, it was reported that the amount of Sr increased significantly in the group treated with bleaching treatment.…”