Mechanical and structural characterization of discontinuous fiber-reinforced dental resin composite

Bijelic-Donova, Jasmina; Garoushi, Sufyan; Lassila, Lippo; Keulemans, Filip; Vallittu, Pekka K.

doi:10.1016/j.jdent.2016.07.009

Cited by 87 publications

(71 citation statements)

References 45 publications

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“…The cutting of fibers was due to the presence of shear forces during mixing. The fiber length of everX was evaluated in several studies and results showed different ranges of short fiber length values, namely 1.3-2.0, 0.1-2.0 and 0.3-1.9 mm 20,21,25) . In this study, the range of fiber length in everX was 0.07-2.5 mm.…”

Section: Discussionmentioning

confidence: 99%

“…In this study, the range of fiber length in everX was 0.07-2.5 mm. It was said that the difference between fiber length ranges might be due to the processing operations, and that the processing generated fiber fractures and resulted in a wider range of fiber lengths 21) . More research is needed to investigate the difference between the initial and final fiber length distribution before and after the mixing procedure, when different speeds and mixing times are applied, to help understand how the mixing procedure influence the fiber length and effectively control the final fiber length after fabrication.…”

Section: Discussionmentioning

confidence: 99%

“…A discontinuous E-glass FRC is commercially available as a resin composite (everX Posterior, GC, Tokyo, Japan). Although studies have found that everX had superior mechanical properties compared with several commercial resin composites [19][20][21][22][23] , it was shown in the study of Leprince et al 24) that everX had inferior mechanical properties in comparison with commerciallyavailable nanohybrid materials. Therefore, the mechanical properties of glass FRCs need to be further improved.…”

Section: Introductionmentioning

confidence: 97%

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Physicochemical properties of discontinuous S2-glass fiber reinforced resin composite

Huang

Qin

Garoushi

et al. 2018

Dental Materials Journal

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The objective of this study was to investigate several physicochemical properties of an experimental discontinuous S2-glass fiberreinforced resin composite. The experimental composite was prepared by mixing 10 wt% of discontinuous S2-glass fibers with 27.5 wt% of resin matrix and 62.5 wt% of particulate fillers. Flexural strength (FS) and modulus (FM), fracture toughness (FT), work of fracture (WOF), double bond conversion (DC), Vickers hardness, volume shrinkage (VS) and fiber length distribution were determined. These were compared with two commercial resin composites. The experimental composite showed the highest FS, WOF and FT compared with two control composites. The DC of the experimental composite was comparable with controls. No significant difference was observed in VS between the three tested composites. The use of discontinuous glass fiber fillers with polymer matrix and particulate fillers yielded improved physical properties and substantial improvement was associated with the use of S2-glass fiber.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Physicochemical properties of discontinuous S2-glass fiber reinforced resin composite

Huang

Qin

Garoushi

et al. 2018

Dental Materials Journal

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“…Evaluating the mechanical and structural characteristics of materials,16 flexural strength,17 and color stability18 has been recently tested nanofilled materials, but there is a lack of studies evaluating adhesive resistance after repair. Rodrigues et al8 observed that the microstructure of composite resins influences average bond strength values, wherein a microhybrid resin displays a higher strength compared to a nanoparticle resin, corroborating results found in our study.…”

Section: Discussionmentioning

confidence: 99%

Shear bond strength of different surface treatments in bulk fill, microhybrid, and nanoparticle repair resins

Tavarez¹,

Júnior²,

Guará³

et al. 2017

CCIDE

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ObjectivesThe purpose of this study was to evaluate the influence of surface treatment and different types of composite resin on the microshear bond strength of repairs.Materials and methodsSeventy-two specimens (n=72) were prepared using a nanoparticle resin and stored in artificial saliva at 37 ± 1°C for 24 h. After this period, the specimens (n=24) were restored with microhybrid resin P60 (3M ESPE), nanoparticle resin Filtek Z350 (3M ESPE), and Bulk Fill Surefil SDR Flow (Dentsply) composite resins. Previously, the surfaces of the samples were treated, forming the following subgroups (n=12): (A) conditioned with 37% phosphoric acid for 30 s, and (B) abrasioned with a diamond tip for 3 s and conditioned with 37% phosphoric acid. In all groups, before insertion of the composite resin, the adhesive system Adper Single Bond 2 was actively applied and photopolymerized for 20 s.ResultsThe microshear test was executed to assess bond strength. Kruskal–Wallis (p<0.05) and Mann–Whitney statistical tests showed significant statistical difference considering that the bulk-fill resin turned out to have a lower bond strength than the conventional nanoparticle and microhybrid composites. With regard to the technique, the roughening with diamond bur followed by the application of phosphoric acid exhibited values higher than the exclusive use of acid.ConclusionThe microshear bond strength of the composite resin repairs varies in accordance with the type of composite resin utilized, and roughening the surface increased the bond strength of these materials.

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“…One material from this category uses the brand name everX Posterior and, similarly to flowable bulk‐fill composite, can also be placed in bulk . Fiber‐reinforced composites have been shown to possess high fracture toughness . Nonetheless, they must also be coated with a top layer of conventional particulate filler composite to protect the fibers and improve the wear resistance during masticatory function .…”

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confidence: 99%

Effect of interface surface design on the fracture behavior of bilayered composites

Omran

Garoushi

Lassila

et al. 2019

European J Oral Sciences

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This study aimed to evaluate the effect of different interface designs on the load‐bearing capacity of bilayered composite structures (BLS). Cylindrical specimens of BLS were prepared from base composite of 3.5 mm thickness and surface composite of 1.5 mm thickness (n = 80). Two different base composites – flowable bulk‐fill (FBF) [smart dentin replacement (SDR)] and short fiber‐reinforced (FRC) (everX Posterior) – were evaluated, and conventional composite (G‐ænial Posterior) was used as the surface layer. Four different interface designs were used: (i) pyramidal; (ii) mesh; (iii) linear grooves; and (iv) flat surface (control). Three‐dimensional printed molds were fabricated to standardize the interface design between the surface and the base composites. The specimens were then statically loaded with a steel ball until fracture using a universal testing machine. Fracture types were classified into catastrophic, complete, and partial bulk. ANOVA revealed that both the material and the interface design had a statistically significant effect on the load‐bearing capacity. Flowable bulk‐fill showed lower mean load‐bearing capacity than FRC in all the interface designs tested, except for the flat surface design. Fracture analysis showed that FRC demonstrated up to 100% partial bulk fractures with the pyramid interface design, but no incidence of catastrophic bulk fracture. By contrast, FBF demonstrated up to 84.6% and 40% catastrophic bulk fractures with the flat interface design but no incidence of partial bulk fracture. Consequently, the interface designs studied enhanced the fracture behavior of BLS.

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Mechanical and structural characterization of discontinuous fiber-reinforced dental resin composite

Cited by 87 publications

References 45 publications

Physicochemical properties of discontinuous S2-glass fiber reinforced resin composite

Physicochemical properties of discontinuous S2-glass fiber reinforced resin composite

Shear bond strength of different surface treatments in bulk fill, microhybrid, and nanoparticle repair resins

Effect of interface surface design on the fracture behavior of bilayered composites

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