engleski

Long-Term Investigation of Mechanical Properties of Bioactive Restorative Materials

Objectives: To evaluate mechanical properties of a new commercially available bioactive restorative material and compare it to established bioactive and inert materials after artificial aging for up to 3 months. Methods: Four materials were tested: alkasite Cention (Ivoclar Vivadent) in self-cure (Cen-SC) or light-cure (Cen-LC) mode, giomer Beautifil II (Shofu ; BII), conventional glass ionomer Fuji IX (GC ; FIX), and resin composite Tetric EvoCeram (Ivoclar Vivadent ; TEC) as a control. For flexural strength (FS) and flexural modulus (FM) testing according to ISO 4049, Cen- LC, BII, and TEC were polymerized with 950 mW/cm2 for 20 s in 6 overlapping exposures on both sides, while Cen-SC and FIX were left to set for 15 min. The specimens (n=60/material) were dark stored in distilled water at 37°C, divided into three groups (n=20) and tested at 24h, 3 months, and 3 months+3 days in ethanol. FS and FM were measured using a customized universal testing machine at 1mm/min crosshead speed. The data were statistically analyzed using the Kruskal-Wallis test, and one- way ANOVA with Bonferroni post-hoc test, p < 0.05. Results: BII (121.8-142.1 MPa) and TEC (107.8- 132.2 MPa) had the highest FS at all time points of measurement, followed by Cen-LC (84.0-104.6 MPa) and Cen-SC (62.1-86.9 MPa). FIX had significantly lowest FS (7.9-12.0 MPa) and the lowest FM (0.5-2.7 GPa). FS and FM decreased at 3mo and after additional aging in ethanol for all materials except BII and Cen-SC. Contrary to other materials, Cen-SC had an increase in FS and FM at 3mo and 3mo+3 compared to 24h. Conclusions: In this study, BII behaved similarly to a composite material and had the best resistance to aging. Alkasite Cention showed better mechanical properties than FIX. Cention should be used in the light-cure mode. This study was supported by Croatian Science Foundation, grant IP-2019-04- 6183.

flexural strength ; flexural modulus ; bioactive composites ; alkasite

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