Naslov
Degree of conversion of experimental bioactive glass-containing composites

Autori
Par, Matej ; Spanovic, Nika ; Gamulin, Ozren ; Marovic, Danijela ; Mandic, Visnja ; Tarle, Zrinka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Clinical oral investigations / - , 2017, 1368-1368

Skup
CONSEURO

Mjesto i datum
Bologna, Italija, 2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
degree of conversion, remineralizing composites, bioactive glass

Sažetak
To investigate the degree of conversion (DC) of experimental composites containing bioactive glass (BG). These composites were previously shown to be capable of precipitating a hydroxyapatite layer on the material surface, which may aid in the prevention of secondary caries. Five light-curable composites were prepared by blending a Bis-GMA/ TEGDMA resin mixture with 4 μm particles of 45S5 BG, barium glass and silica in variable ratios. Total filler load was 70 wt%, whereas the ratio of BG varied from 0–40 wt%. Composite specimens (n=5 per material) were light-cured (20 s at 1000 mW/cm2) in cylindrical split-molds and the DC was investigated by FT-Raman spectroscopy immediately after curing and 24 h post-cure, for layer thicknesses up to 4 mm. A commercial composite was used as a reference. The surface DC of experimental composites measured immediately after light-curing ranged from 52.9-67.4%. A significant post-cure DC increase of 9.6-13.8% occurred in all experimental materials. A decreasing tendency of the extent of post-cure reaction in materials with higher percentage of BG was observed. Post-cure DC values ranged from 62.5-81.2% at the material surface, 55.8-80.2% at 1 mm, 39.2-78.3% at 2 mm, 25.1-74.6% at 3 mm, and 10.7-64.5% at 4 mm. The tendency of the DC to decrease with increasing percentage of bioactive glass was consistent for allmeasuring depths. Thus, in all the abovementioned DC ranges, the lowest and the highest values correspond to composites with 40 and 0 wt% of BG, respectively. The DC for the commercial reference material ranged from 17.4-72.9%. Experimental bioactive composites filled with BG were capable of attaining theDCin the range of commercial composites. However, high amount of BG considerably impaired themaximum DCat the composite surface and caused a more pronounced DC decline at increasing layer thickness.

Izvorni jezik
Engleski

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