Naslov
Protective effect of experimental bioactive composites on enamel – a pilot study

Autori
Španović, Nika ; Par, Matej ; Attin, Thomas ; Tarle, Zrinka ; Tauböck, Tobias T.

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

Izvornik
Abstracts of the 4th International Congress of the Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb in coorganizing the Croatian Society for Minimal Interventional Dental Medicine CMA. U: Acta stomatologica Croatica vol.54 br.4 / Karlović, Zoran ; Matijević, Jurica - , 2020, 448-448

Skup
IV. kongres s Zavoda za endodonciju i restaurativnu stomatologiju Stomatološkog fakulteta Sveučilišta u Zagrebu = 4th International Congress of the Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb

Mjesto i datum
Zagreb, Hrvatska, 23.10.2020. - 24.10.2020

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
bioactive composites ; bioactive glass ; microhardness ; remineralization ; pH

Sažetak
Aim: Bioactive glasses (BGs) can be used to render resin composites anti-cariogenic. This pilot study aimed to investigate the protective effect of experimental BG-composites on enamel immersed in a repeatedly replenished acidic solution. Materials and methods: Three experimental composites based on a photo-curable resin (60:40 wt% bisphenol-A- glycidyldimethacrylate and triethylene glycol dimethacrylate) and a total filler ratio of 70 wt% were prepared by replacing 0, 10, and 20 wt% of silanized reinforcing fillers (barium glass and silica) with unsilanized BG 45S5. Enamel blocks (3x3x1 mm, n=9) were prepared from intact human third molars. Light-cured composite specimens (diameter=7 mm, thickness=2 mm, n=3 per material) were immersed with enamel blocks in a lactic acid solution (5 mL, pH=4.0). The immersion medium was replenished every four days. Knoop microhardness (MH ; load=100 g, dwell time=20 s ; n=5 per measurement) and pH of the immersion medium were assessed at the following time points (days): 0, 4, 8, 12, 16, and 20. Statistical analysis was performed using a nonparametric one-way ANOVA on ranks (Kruskal–Wallis). Results: The enamel blocks immersed with the 0 wt%-BG composite showed a statistically significant MH decline after 4 days, whereas the MH of enamel blocks immersed with the 10 wt%-BG composite remained unchanged up to 8 days. The enamel blocks immersed with the 20 wt%- BG composite showed no statistically significant MH change throughout the whole observation period. The pH value of the immersion medium was unchanged by the 0 wt%-BG composite, for the 10 wt% BG composite a transient pH increase was observed, while the 20 wt%-BG composite showed an extensive increase up to pH=9.8, which was maintained throughout the whole observation period. Conclusions: A dose-dependent protective effect against repeated acid attacks was identified for experimental composites functionalized with 10–20 wt% of BG 45S5.

Izvorni jezik
Hrvatski, engleski

Znanstvena područja
Dentalna medicina

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