Details

Autor(en) / Beteiligte

• Silva Prezotto, A. F.
• Silva, D. B.
• Vitti, R. P.
• Sinhoreti, M. A. C.
• Brandt, W. C.

Titel

Light curing and ratio of glass/fumed silica fillers on degree of conversion and mechanical properties of experimental composite resins

Ist Teil von

• Journal of applied polymer science, 2019-02, Vol.136 (7), p.n/a

Ort / Verlag

Hoboken, USA: John Wiley & Sons, Inc

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• ABSTRACT This study evaluated the degree of conversion and mechanical properties of experimental composite resins made with different fillers and light‐curing methods. All composites had the same organic matrix (40% wt) and photoinitiator system (1.2% wt). Experimental composite groups were divided according to ratio (%) of silanated ground glass (0.5 μm) (BaAlSi) and fumed silica (SiO2): 100/0, 90/10, 80/20, and 70/30. Light‐emitting diode light was used in the continuous, soft‐start, and pulse‐delay modes (n = 10). Degree of conversion was determined using attenuated total reflectance–Fourier transform infrared spectroscopy. Flexural strength and modulus were obtained using a universal testing machine, and Knoop microhardness was measured in a Knoop indenter. The data were subjected to a two‐way ANOVA and Tukey's post hoc test (α = 0.05). Continuous‐light exposure of the 100/0 group produced the highest degrees of conversion. Soft‐start exposure of the 70/30 groups produced the highest Knoop microhardness. The pulse‐delay method produced the lowest flexural strength and modulus values. The 100/0 and 70/30 groups had the lowest flexural strength and flexural modulus, respectively. Application of continuous‐light output with composite resins containing a ratio of 80/20 (BaAlSi/SiO2) fillers generated the best results regarding the degree of conversion and mechanical properties. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47008.