Dimensional stability of short fibre reinforced flowable dental composites

AbstractFibre-reinforced dental composites are proven to have superior mechanical properties in comparison with micro/nano/hybrid filled composites. However, the addition of small quantities of short glass fibres could affect the dimensional stability of the restoration both during initial stages as well as through the life of the restoration. This in-vitro study aims at evaluating the physical properties of short S-Glass reinforced flowable dental composites. Two S-Glass short fibre-particulate reinforced (5 wt% of aspect ratios 50 and 70) and one particulate only reinforced flowable dental composites were prepared with UDMA-TEGDMA based dental monomer systems. Samples were photopolymersied for 60 s and stored in distilled water at 37 °C for 24 h before testing. Depth of cure (through-thickness microhardness), volumetric shrinkage (Archimedes technique), polymerisation stress (cantilever based tensometer), curing exotherm (thermocouple), water sorption and solubility (ISO 4049) and thermal expansion coefficient (dilatometer) were determined. The test results were statistically analysed using one-way ANOVA (p < 0.05). Depth of cure increased by 41%, volumetric shrinkage increased by 8.3%, shrinkage stress increased by 37.6%, exotherm increased by 20.2%, and thermal expansion reduced by 6.4% while water sorption and solubility had a negligible effect with the inclusion of short glass fibres. The study demonstrates that within the same organic resin system and quantity, a small replacement of fillers with short fibres could significantly affect the dimensional stability of the composite system. In conjunction with mechanical properties, this study could help clinicians to gain confidence in fibre reinforced dental composite restorative system.

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Influence of artificial aging: mechanical and physicochemical properties of dental composites under static and dynamic compression

Clinical Oral Investigations ◽

10.1007/s00784-021-04122-0 ◽

2021 ◽

Author(s):

D. C. Gornig ◽

R. Maletz ◽

P. Ottl ◽

M. Warkentin

Keyword(s):

Mechanical Properties ◽

Water Sorption ◽

Artificial Aging ◽

Filler Content ◽

Dynamic Compression ◽

The Other ◽

Chemical Degradation ◽

Dental Composites ◽

Compression Tests ◽

Acid Ph

Abstract Objective The aim of the study was to evaluate the influence of filler content, degradation media and time on the mechanical properties of different dental composites after in vitro aging. Materials and Methods Specimens (1 mm3) of three commercially available composites (GrandioSO®, Arabesk Top®, Arabesk Flow®) with respect to their filler content were stored in artificial aging media: artificial saliva, ethanol (60%), lactic acid (pH 5) and citric acid (pH 5). Parameters (Vickers microhardness, compressive strength, elastic modulus, water sorption and solubility) were determined in their initial state (control group, n = 3 for microhardness, n = 5 for the other parameters) and after 14, 30, 90 and 180 days (n = 3 for microhardness, n = 5 for the other parameters for each composite group, time point and media). Specimens were also characterized with dynamic-mechanical-thermal analysis (compression tests, F = ± 7 N; f = 0.5 Hz, 1 Hz and 3.3 Hz; t = 0–170 °C). Results Incorporation of fillers with more than 80 w% leads to significantly better mechanical properties under static and dynamic compression tests and a better water sorption behavior, even after chemical degradation. The influence of degradation media and time is of subordinate importance for chemical degradation. Conclusion Although the investigated composites have a similar matrix, they showed different degradation behavior. Since dentine and enamel occur only in small layer thickness, a test specimen geometry with very small dimensions is recommended for direct comparison. Moreover, the use of compression tests to determine the mechanical parameters for the development of structure-compatible and functionally adapted composites makes sense as an additional standard. Clinical relevance Preferential use of highly filled composites for occlusal fillings is recommended.

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Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

Dental Materials Journal ◽

10.4012/dmj.2015-280 ◽

2016 ◽

Vol 35 (3) ◽

pp. 418-424 ◽

Cited By ~ 29

Author(s):

Akimasa TSUJIMOTO ◽

Wayne W. BARKMEIER ◽

Toshiki TAKAMIZAWA ◽

Mark A. LATTA ◽

Masashi MIYAZAKI

Keyword(s):

Mechanical Properties ◽

Resin Composite ◽

Short Fiber ◽

Volumetric Shrinkage ◽

Fiber Reinforced ◽

Depth Of Cure

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Water sorption and mechanical properties of dental composites

Biomaterials ◽

10.1016/0142-9612(90)90159-n ◽

1990 ◽

Vol 11 (3) ◽

pp. 219-223 ◽

Cited By ~ 37

Author(s):

C. Bastioli ◽

G. Romano ◽

C. Migliaresi

Keyword(s):

Mechanical Properties ◽

Water Sorption ◽

Dental Composites

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Thermo-oxidative ageing effect on mechanical properties and morphology of short fibre reinforced polyamide composites – comparison of carbon and glass fibres

RSC Advances ◽

10.1039/c7ra07884f ◽

2017 ◽

Vol 7 (69) ◽

pp. 43334-43344 ◽

Cited By ~ 15

Author(s):

Lin Sang ◽

Chuo Wang ◽

Yukai Wang ◽

Zhiyong Wei

Keyword(s):

Mechanical Properties ◽

Mechanical Performance ◽

Polyamide 6 ◽

Short Fibre ◽

Schematic Model ◽

Ageing Effect ◽

Glass Fibres ◽

Oxidative Ageing

Schematic model of mechanical performance of short fibre reinforced polyamide 6 composites for thermo-oxidative ageing at different ageing temperatures.

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Influence of short glass fibres and weldlines on the mechanical properties of injection-moulded acrylonitrile–styrene–acrylate copolymer

Journal of Materials Science ◽

10.1023/a:1004362915713 ◽

1998 ◽

Vol 33 (12) ◽

pp. 2985-3000 ◽

Cited By ~ 19

Author(s):

Z. U Nabi ◽

S Hashemi

Keyword(s):

Mechanical Properties ◽

Glass Fibres ◽

Acrylate Copolymer ◽

Short Glass

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The effect of TiO2 nanotubes reinforcement on the mechanical properties and wear resistance of silica micro-filled dental composites

Journal of Composite Materials ◽

10.1177/0021998318818882 ◽

2018 ◽

Vol 53 (23) ◽

pp. 3217-3228 ◽

Cited By ~ 3

Author(s):

Abolfazl Mirjalili ◽

Ali Zamanian ◽

Seyed Mohammad Mahdi Hadavi

Keyword(s):

Mechanical Properties ◽

Wear Resistance ◽

Flexural Strength ◽

Water Sorption ◽

Hydrothermal Process ◽

Physical And Mechanical Properties ◽

Dental Composite ◽

Dental Composites ◽

Dental Resin ◽

Electron Microscopies

One of the most important aspects of dental resin composites is the ability to improve mechanical properties by adding reinforcing filler particles. TiO2 nanotubes are expected to improve the physical and mechanical properties of silica micro-filled dental composite. Therefore, TiO2 nanotubes were synthesized using an alkaline hydrothermal process and then functionalized with 3-methacryloxypropyl-trimethoxysilane. TiO2 nanotubes were characterized by scanning and transmission electron microscopies, X-ray diffraction and Fourier transform infrared spectroscopy. Different quantities of TiO2 nanotubes and silica microparticles were reinforced in bisphenol A-glycidyl methacrylate (Bis-GMA) and tri-ethylene glycol dimethacrylate to prepare dental composite samples. Thereafter, the flexural strength and modulus, compressive strength, degree of conversion of monomers, wear resistance and water sorption were utlized to examine the prepared composites. The flexural strength and wear resistance of composites with 3 wt% TiO2 nanotubes significantly increased in comparison with other composites. On the other hand, due to the stability of composite, the water sorption was decreased. Therefore, TiO2 nanotubes reinforcement could be a promising solution for the improvement of mechanical properties in dental composites.

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