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- Title
CROSSLINKING DENSITY OF EXPERIMENTAL DENTAL COMPOSITES WITH COPPER-DOPED MESOPOROUS BIOACTIVE NANOSPHERES.
- Authors
Bota, Maria; Tarle, Frano; Par, Matej; Haugen, Håvard J.; Kai Zheng; Boccaccini, Aldo R.; Marovic, Danijela
- Abstract
Aim: Copper-doped mesoporous bioactive nanospheres (Cu-MBGN) were developed to prevent secondary caries by imparting antimicrobial and ion-releasing/remineralizing properties to experimental composites. The crosslinking density of the polymer network determines the material's mechanical properties, residual monomer release and durability. In this study, we aimed to investigate whether Cu-MBGN affects the crosslink density of the polymer network using the ethanol softening test. Materials and Methods: Seven experimental composites were prepared containing 1, 5, or 10 wt% Cu-MBGN and the corresponding inert controls (silica) and bioactive controls (bioactive glass 45S5). The resin matrix consisted of 35 wt% BisGMA/TEGDMA and 51-55 wt% barium glass microfillers. Cylindrical samples (n=5; h=2 mm, d=6 mm) were photopolymerized at 700 mW/cm2 for 2x20 s and dark stored at 37°C. After polishing, Vickers microhardness (HV; 100 g load, 15 s dwell time) was measured at 5 positions/sample and before and after storage in absolute ethanol for 7 days in the dark at 37°C. One-way analysis ANOVA and Tukey's post hoc test (p<0.05) were used for statistical analysis. Results: Composites containing Cu-MBGN had the highest HV both before and after ethanol storage (61.2-50.6 VHN), while bioactive controls containing 10 or 15 wt% 45S5 had the lowest HV (40.6-35.2 VHN). Ethanol storage decreased HV the most for the inert control materials (12.5% and 10.4% decrease), followed by the material containing 10% Cu-MBGN, which had 8% lower HV values. However, there was no statistically significant difference between the materials in the before/after ratio. Materials with 1 and 5 wt% Cu-MBGN had the lowest HV decrease (6.2 and 5.5%, respectively) and the highest absolute HV values before and after ethanol softening. Conclusion: Composite with 5 wt% Cu-MBGN in combination with nanosilica fillers exhibited the lowest ethanol softening, indicating the polymer's highest durability and crosslinking density.
- Subjects
DENTAL materials; DOPING agents (Chemistry); MECHANICAL behavior of materials; POLYMER networks; BIOACTIVE glasses
- Publication
Acta Stomatologica Croatica, 2022, Vol 56, Issue 4, p442
- ISSN
0001-7019
- Publication type
Article