Naslov
Dentin Bond Strength of Experimental Composites Containing Bioactive Glass

Autori
Par, Matej ; Ilie, Nicoleta ; Hickel, Reinhard ; Tarle, Zrinka

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

Izvornik
CED-IADR 2017 Abstract book / - , 2017, 119-119

Skup
CED-IADR/NOF Oral Research Congress

Mjesto i datum
Beč, Austrija, 2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
bond strenght, bioactive composites, bioactive glass

Sažetak
Objectives To investigate the bond strength of novel bioactive composites capable of precipitating hydroxyapatite on their surface. Methods Five light-curable composites were prepared by blending a Bis-GMA/TEGDMA comonomer with 45S5 bioactive glass (BG), barium glass and silica. Total filler load was 70wt% and the ratio of BG was varied from 0-40wt%. The commercial composite Beautifil Bulk Flowable (Shofu) was used as a reference. Mid-coronal dentin slabs (n=360) were obtained from intact third molars, embedded in a cold-cure acrylic resin, wet ground with P600 SiC paper and randomly divided into 6 groups (n=60 per material). Composite cylinders (d=3mm, h=4mm) were bonded on the dentin slabs with a two-step self-etch bonding agent (Clearfil SE Bond 2, Kuraray). After aqueous storage at 37°C for 1 week, 1 month and 3 months, n=20 specimens per material and storage time were randomly withdrawn for shear bond strength testing at the crosshead speed of 0.5mm/min. Bond strength data were analyzed using the two-way ANOVA, Pearson correlation and Weibull statistics. Results Material composition had a higher influence on bond strength (partial η2=0.817, p<0.001) than storage time (partial η2=0.054, p<0.001), with a significant interaction of both factors (p<0.001). Increasing the amount of BG decreased the bond strength in a linear manner (Pearson’s R: 0.996, 0.994 and 0.955, for 1 week, 1 month and 3 months respectively, p<0.01). Material reliability represented by the Weibull modulus decreased with higher amount of BG, but increased with aging. Only the composites with BG loading of 20wt% or more showed a decline in bond strength with aging. The failure mode was mostly mixed (61.7%) or adhesive (36.9%), with a low number of cohesive (1.4%) and no pre-failures. Conclusions Experimental composites with up to 10wt% of BG showed acceptable bond strength that did not deteriorate during aging up to 3 months.

Izvorni jezik
Engleski

POVEZANOST RADA