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Clinical Oral Investigations

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25.10.2018 | Original Article

Mechanical properties of experimental composites containing bioactive glass after artificial aging in water and ethanol

verfasst von: Matej Par, Zrinka Tarle, Reinhard Hickel, Nicoleta Ilie

Erschienen in: Clinical Oral Investigations | Ausgabe 6/2019

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Abstract

Objectives

To evaluate the effect of bioactive glass 45S5 (BG) in experimental composites on flexural strength (FS), flexural modulus (FM), modulus of resilience (MR), and material reliability after artificial aging in water for 1, 7, and 30 days, and an additional accelerated aging for 3 days in a 75 vol% ethanol-water solution.

Materials and methods

Five experimental light-curable composites were prepared with 0–40 wt% of BG and a total filler load of 70 wt%. The resinous matrix was Bis-GMA/TEGDMA in 60:40 by weight. Mechanical properties were evaluated using a three-point bending test (ISO/DIN 4049:1998) with n = 20. Weibull statistics were used to assess material reliability. Additionally, the degree of conversion (DC) was assessed 24 h post-cure using FT-Raman spectroscopy.

Results

FS and FM decreased linearly as the amount of BG was increased. The ISO 4049 requirement for a minimum FS of 80 MPa was fulfilled in experimental composites with up to 20 wt% of BG. Degradation of FS and FM with artificial aging was more extensive in materials with higher BG amounts. MR decreased as a function of BG amount and artificial aging. Material reliability (Weibull modulus) was stable through aging for composites with up to 10 wt% of BG. DC was negatively influenced by the BG amount and ranged from 64 to 81%.

Conclusion

Increasing the amount of unsilanized BG fillers from 0 to 40 wt% resulted in a progressive decline in mechanical properties and a more extensive degradation during artificial aging.

Clinical relevance

Bioactive fillers diminished the mechanical properties in a dose-dependent manner.

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Titel: Mechanical properties of experimental composites containing bioactive glass after artificial aging in water and ethanol
verfasst von: Matej Par
Zrinka Tarle
Reinhard Hickel
Nicoleta Ilie
Publikationsdatum: 25.10.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Oral Investigations / Ausgabe 6/2019
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-018-2713-6

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Mechanical properties of experimental composites containing bioactive glass after artificial aging in water and ethanol

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

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Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

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