Mechanical and Rheological Properties of Flowable Resin Composites Modified with Low Addition of Hydrophilic and Hydrophobic TiO2 Nanoparticles

The aim of this work was to find the influence of the addition of low amount of hydrophilic and hydrophobic TiO2 nanoparticles on compressive strength, microhardness and rheological properties of flowable dental composite material. Specimens were prepared by adding 0.05; 0.2 and 1 wt. % of hydrophilic and hydrophobic 20 nm TiO2 nanoparticles. These specimens were compared to non-modified control specimens in compressive strength and microhardness. Furthermore, their rheological properties were determined. The optimal nanoparticle loading was 0.2 % hydrophobic TiO2, resulting in significantly higher compressive strength and microhardness than those of the control specimen group. Mechanical properties of flowable composites reinforced with hydrophilic and hydrophobic TiO2 at higher loadings are lower than those of control specimens, which is the result of nanoparticle agglomeration. TiO2 nanoparticles addition resulted in the decrease in viscosity in all specimens except for the specimewn with 1% hydrophilic TiO2 nanoparticles. In accordance to the obtained results, hydrophobic nanoparticle addition results in a more resistant and durable material, combined with an increased flowability compared to a non-modified composite.

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Mechanical properties of resin composites containing bioactive glass and experimental nano zinc-silica complex

International Dental Research ◽

10.5577/intdentres.2021.vol11.suppl1.21 ◽

2021 ◽

Vol 11 (Suppl. 1) ◽

pp. 137-142

Author(s):

Mehmet Gökberkkaan Demirel ◽

Makbule Tuğba Tunçdemir

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Flexural Strength ◽

Bioactive Glass ◽

Resin Composite ◽

Testing Machine ◽

Control Sample ◽

Dental Composite ◽

Resin Composites ◽

Nano Zinc

Aim: Secondary caries is an important problem in dental composite restoration, and nanoparticles are commonly added to the structures of resin composites to improve their antimicrobial properties. The aim of this study is to evaluate the mechanical properties of composite materials containing bioactive glass (BAG) and an experimental nano zinc-silica (NZS) complex. Methodology: An experimental resin composite containing 70 wt% filler was produced and used as a control sample. This experimental resin composite was then modified by adding different amounts of BAG (10%), NZS (10%), and both BAG and NZS (10% + 10%). NZS was synthesized in situ by milling zinc and silica to nanoscale level. Compressive strength and flexural strength were investigated using a universal testing machine. Data were analyzed using one-way ANOVA and the Tukey post-hoc test. Results: There were no statistically significant differences in compressive strength caused by the filler amount, but statistically significant changes were found in flexural strength. Although the addition of antimicrobial agents to resin composites reduces their physical properties, this is not a clinically unacceptable limit. Conclusion: NZS exhibits better mechanical properties than does BAG, but both materials can be used safely in restorative materials. How to cite this article: Tunçdemir MT, Demirel MG. Mechanical properties of resin composites containing bioactive glass and experimental nano zinc-silica complex. Int Dent Res 2021;11(Suppl.1):137-42. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.21 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

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Evaluation of Mechanical Behavior and Microstructural Characteristics of Photocatalytic Concretes to Be Used as Pavement Blocks

Journal of Engineering Materials and Technology ◽

10.1115/1.4033275 ◽

2016 ◽

Vol 138 (3) ◽

Author(s):

João Victor Staub de Melo ◽

Glicério Trichês

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Mechanical Behavior ◽

Tio2 Nanoparticles ◽

Modulus Of Elasticity ◽

Microstructural Characteristics ◽

State Tests ◽

Fresh State ◽

Hardened State ◽

Microstructural Behavior

This paper reports the results obtained in a study on the effect of the addition of TiO2 nanoparticles on the mechanical properties and microstructural characteristics of photocatalytic concretes. In the hardened state, tests to determine the compressive strength and modulus of elasticity were carried out. Also, microstructural aspects of the samples were investigated. In the fresh state, the influence of the addition of TiO2 on the concrete compaction and conduction calorimetry curves was evaluated. The results obtained indicated a better mechanical and microstructural behavior of concrete with addition of TiO2.

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Effect of fly ash on physical and mechanical properties of mortar

Journal of Science and Technology Issue on Information and Communications Technology ◽

10.31130/jst-ude2018-292 ◽

2019 ◽

Vol 17 (6) ◽

pp. 35

Author(s):

Vu-An Tran

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Flexural Strength ◽

Water Absorption ◽

Thermal Power ◽

Setting Time ◽

Physical And Mechanical Properties ◽

Flow Density ◽

Control Specimen

This research investigates the physical and mechanical properties of mortar incorporating fly ash (FA), which is by-product of Duyen Hai thermal power plant. Six mixtures of mortar are produced with FA at level of 0%, 10%, 20%, 30%, 40%, and 50% (by volume) as cement replacement and at water-to-binder (W/B) of 0.5. The flow, density, compressive strength, flexural strength, and water absorption tests are made under relevant standard in this study. The results have shown that the higher FA content increases the flow of mortar but significantly decreases the density of mixtures. The water absorption and setting time increases as the samples incorporating FA. Compressive strength of specimen with 10% FA is approximately equal to control specimen at the 91-day age. The flexural strength of specimen ranges from 7.97 MPa to 8.94 MPa at the 91-day age with the best result for samples containing 10% and 20% FA.

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COMPARATIVE EVALUATION OF EFFECT OF TWO LIGHT CURING UNITS ON MECHANICAL PROPERTIES OF FILTEK BULK FILL COMPOSITE

International Journal of Advanced Research ◽

10.21474/ijar01/12424 ◽

2021 ◽

Vol 9 (02) ◽

pp. 104-110

Author(s):

Akshay Punjabi ◽

◽

Rahul Rao ◽

Ashish K. Jain ◽

Meenakshi Verma ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

Testing Machine ◽

Dental Composite ◽

Light Curing ◽

Circular Rings ◽

The Difference ◽

Diametral Tensile Strength

Context:The quality of light curing units can profoundly influence mechanical properties of dental composite materials. Aim: To compare effect of Woodpecker RTA Mini-S and Elipar Deep Cure-L curing units onmechanical properties (compressive strength, diametral tensile strength and microhardness) of Filtek Bulk-Fill. Methods and Materials: A total of 32 samples of Filtek Bulk Fill composite were divided into 2 equal groups (n=16). 12 samples in each group were fabricated using a tooth shaped mold and 4 in circular rings to test compressive strength, microhardness and diametral tensile strength, respectively. Theblocks were evaluated for the above parameters using Universal Testing Machine and Vickers Microhardness Tester.Independent sample-t test was used in this study (p< 0.05). Results: The results of this study showed that the group of composites cured using Elipar Deep Cure-L curing unit showed better mechanical properties and the difference between the groups was statistically significant for compressive strength and diametral tensile strength (p < 0.05) Conclusion: It was concluded that a curing unit of higher intensity and quality of output used in conjugation with bulk fill composites are likely to give better results.

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Influence of Solid Content, Cement/Tailings Ratio, and Curing Time on Rheology and Strength of Cemented Tailings Backfill

Minerals ◽

10.3390/min10100922 ◽

2020 ◽

Vol 10 (10) ◽

pp. 922

Author(s):

Jiajian Li ◽

Erol Yilmaz ◽

Shuai Cao

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Rheological Properties ◽

Flow Rate ◽

Unconfined Compressive Strength ◽

Solid Content ◽

Similar Type ◽

Curing Time ◽

Flow Process ◽

Resistance Loss

Understanding the flow process of cemented tailings backfill (CTB) is important for successful pumping into underground stopes. This study examines the effects of solid content (SC), cement/tailings (c/t) ratio, and curing time (CT) on rheological and mechanical properties of CTB mixes. The slurry concentration of the mixes was 65, 67, and 69 wt. %, with c/t ratios ranging from 1:4 to 1:20. Unconfined compressive strength (UCS) tests were performed on hardened CTB mixes after curing 3, 7, and 28 days. The rheological properties of CTB slurries are mainly related to SC. The yield stress and viscosity of fresh mixes increase with increasing SC, but the pipeline resistance loss (PRL) also increases with increasing SC. According to the analysis of variance, the SC and flow rate are the most significant parameters which greatly affect the PRL performance. The c/t and CT parameters are the most significant parameters for affecting the shrinkage rate. The findings offer a reference for theoretical optimization for mine filling systems of similar type.

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

Materials ◽

10.3390/ma13061477 ◽

2020 ◽

Vol 13 (6) ◽

pp. 1477 ◽

Cited By ~ 1

Author(s):

Ioana-Codruţa Mirică ◽

Gabriel Furtos ◽

Bogdan Bâldea ◽

Ondine Lucaciu ◽

Aranka Ilea ◽

...

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Flexural Strength ◽

Flexural Modulus ◽

Filler Loading ◽

The Other ◽

Inorganic Filler ◽

Resin Composites ◽

Homogeneous Type ◽

Sem Images

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.

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The physico-mechanical properties of concrete with red-mud at high temperatures

Challenge Journal of Concrete Research Letters ◽

10.20528/cjcrl.2020.04.001 ◽

2020 ◽

Vol 11 (4) ◽

pp. 82

Author(s):

Ibrahim A. Alameri ◽

Meral Oltulu

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

High Temperatures ◽

Red Mud ◽

Economic Benefits ◽

Control Specimen ◽

Capillary Water ◽

Capillary Water Absorption ◽

The Right

Reuse of treated waste can provide significant environmental, social and economic benefits. It is necessary to use it in the right places while keeping the properties of the waste in mind. Aluminum-rich wastes such as red mud derived from bauxite may be used in places exposed to high temperatures. This article discusses the effects of high temperatures of 25, 200, 300, 400, 600 and 800°C and 3 hours of exposure on concrete samples replaced by red mud at 0, 10, 15 and 20%. To study the concrete’s mechanical and permeability properties, loss in weight, compressive strength, splitting tensile strength, capillary water absorption and water permeability tests were performed for all mixes. Results were closer to those of the control specimen, which ultimately supported the use of red mud at a ratio of 10%.

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Mechanical Properties of Concrete Added with Chicken Rachis as Reinforcement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.147.37 ◽

2011 ◽

Vol 147 ◽

pp. 37-41 ◽

Cited By ~ 3

Author(s):

Ezahtul Shahreen Ab Wahab ◽

Siti Fatimah Che Osmi

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

Mechanical Test ◽

Plain Concrete ◽

Mechanical Tests ◽

Control Specimen ◽

Chicken Feather ◽

Cement Concrete ◽

Concrete Mix

This investigation was carried out to look the possibility of using chicken rachis as reinforcement in concrete mix. In this study, two different percentage of rachis from chicken feather were added to plain concrete comprises of 1% and 2% from the total weight of cement. Concrete with grade 30 were formed by using chicken rachis as additive material. Selected mechanical test were performed and the results were analysed. The mechanical tests included compressive strength, and splitting tensile strength. Comparison was made of these values and those of control specimen (without chicken rachis). The results showed an increment on strength for all mechanical tests done using concrete added with 1% chicken rachis compared to 2% chicken rachis added and those control specimens.

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Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Polymers ◽

10.3390/polym12020478 ◽

2020 ◽

Vol 12 (2) ◽

pp. 478 ◽

Cited By ~ 6

Author(s):

Jiahui Wang ◽

Yizhi Liu ◽

Jianxin Yu ◽

Yi Sun ◽

Weili Xie

Keyword(s):

Mechanical Properties ◽

Composite Resin ◽

Dental Composite ◽

Resin Composites ◽

Dental Resin ◽

Dental Resin Composites ◽

Dental Composite Resin ◽

Light Curing ◽

Curing Method ◽

Oligomeric Silsesquioxane

Various amounts of methacryl polyhedral oligomeric silsesquioxane (POSS) were explored to be incorporated into novel nano SiO2 dental resin composites using light curing method. The scanning electron microscopy (SEM), optical microscopy, fourier transform infrared spectroscopy (FTIR), nanoindentation, nanoscratch and three-point flexure tests were performed. The volumetric shrinkage and mechanical properties such as hardness, elastic modulus, resistance, flexural strength and fracture energy were analyzed. With the additions of POSS, the volume shrinkage decreased and the mechanical properties initially increased. The effects of POSS on these properties were studied to provide a reference for clinically selecting a composite resin with excellent properties.

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Effect of Filler Ratio on Properties of Nanohydroxyapatite/SiO2 Based Bioactive Dental Resin Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.745-746.466 ◽

2013 ◽

Vol 745-746 ◽

pp. 466-472 ◽

Cited By ~ 3

Author(s):

Feng Wei Liu ◽

Jing Hang Hu ◽

Rui Li Wang ◽

Ying Ying Pan ◽

Xiao Ze Jiang ◽

...

Keyword(s):

Compressive Strength ◽

Water Sorption ◽

Filler Loading ◽

Dental Composite ◽

Lower Amount ◽

Resin Composites ◽

Dental Resin ◽

Bioactive Materials ◽

Solubility In Water ◽

Dental Resin Composites

Hydroxyapatite (HAP), as an essential component of bone and tooth, is one of the promising bioactive materials. The purpose of this study was to investigate the effects of incorporation of nanoHAP and SiO2 particles on the properties of bioactive dental composite. Silanized HAP and SiO2 were mixed with BisGMA/TEGDMA (1/1 wt/wt) monomers at various HAP/SiO2 mass ratios of 0:7 (no HAP), 5.25/1.75, 3.5/3.5, 1.75/5.25, 7:0 (no SiO2) to yield a series of pastes all containing 70 wt% filler loading. The results showed that flexural strength, elastic modulus and compressive strength gradually decreased with increasing amount of HAP particles, as well as curing depth and polymerization shrinkage, which resulted from the nature of HAP particle material. Water sorption and solubility in water increased slightly with addition of HAP particles. Degree of conversion test could support results above well. Remineralization test in SBF demonstrated dental composite with HAP particles had a good apatite-forming ability. Consequently, dental composite filled with lower amount of nanoHAP (HAP/SiO2 around 0.25) particles would possess better comprehensive performances.

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