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Open AccessArticle

Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites

1
Department of Oral Health, Iuliu Hatieganu University of Medicine and Pharmacy, 400012 Cluj- Napoca, Romania
2
Department of Dental Materials, Babes-Bolyai University-Raluca Ripan, Institute of Research in Chemistry, 400294 Cluj-Napoca, Romania
3
Nicolae Testimiteanu, State University of Medicine and Pharmacy, 2004 Chisinau, Republic of Moldova
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1477; https://doi.org/10.3390/ma13061477
Received: 27 February 2020 / Revised: 17 March 2020 / Accepted: 20 March 2020 / Published: 24 March 2020
(This article belongs to the Special Issue Advanced Technologies for Sustainable Materials)
The aim of this study was to evaluate the correlation between the percent of inorganic filler by weight (wt. %) and by volume (vol. %) of 11 flowable resin composites (FRCs) and their mechanical properties. To establish the correlation, the quantity of inorganic filler was determined by combustion and shape/size analyzed by SEM images. The compressive strength (CS), flexural strength (FS), and flexural modulus (FM) were determined. The CS values were between 182.87-310.38 MPa, the FS values ranged between 59.59 and 96.95 MPa, and the FM values were between 2.34 and 6.23 GPa. The percentage of inorganic filler registered values situated between 52.25 and 69.64 wt. % and 35.35 and 53.50 vol. %. There was a very good correlation between CS, FS, and FM vs. the inorganic filler by wt. % and vol. %. (R2 = 0.8899–0.9483). The highest regression was obtained for the FM values vs. vol. %. SEM images of the tested FRCs showed hybrid inorganic filler for Filtek Supreme XT (A3) and StarFlow (A2) and a homogeneous type of inorganic filler for the other investigated materials. All of the FS values were above 50 MPa, the ISO 4049/2019 limit for FRCs. View Full-Text
Keywords: flowable resin composites; mechanical properties; compressive strength; flexural strength; flexural modulus flowable resin composites; mechanical properties; compressive strength; flexural strength; flexural modulus
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MDPI and ACS Style

Mirică, I.-C.; Furtos, G.; Bâldea, B.; Lucaciu, O.; Ilea, A.; Moldovan, M.; Câmpian, R.-S. Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites. Materials 2020, 13, 1477.

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