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Article: XGB Modeling Reveals Improvement of Compressive Strength of Cement-Based Composites with Addition of HPMC and Chitosan.

Ege, Duygu / Kamali, Ali Reza

2024 Volume 17, Issue 2

Abstract: This study investigates the improvement in the compressive strength of cellulose/cement-based composites. Methyl cellulose (MC), carboxymethyl cellulose (CMC), and hydroxypropyl cellulose (HPMC) are separately used as the cellulose phase with different ... ...

Abstract	This study investigates the improvement in the compressive strength of cellulose/cement-based composites. Methyl cellulose (MC), carboxymethyl cellulose (CMC), and hydroxypropyl cellulose (HPMC) are separately used as the cellulose phase with different wt%. Graphene oxide (GO) and zoledronic acid (ZOL) are used as additives for bone regeneration for various formulations. Utilizing Extreme Gradient Boosting (XGB) modeling, this research demonstrates the roles of the choice of the cellulose phase, wt% of cement phase, % gelatin, % citric acid, degradation time, and concentration of GO and ZOL in influencing compressive strength. The XGB regression model, with an R
Language	English
Publishing date	2024-01-11
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma17020374
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Article: Action Mechanisms of Curcumin in Alzheimer's Disease and Its Brain Targeted Delivery.

Ege, Duygu

Materials (Basel, Switzerland)

2021 Volume 14, Issue 12

Abstract: AD is a chronic neurodegenerative disease. Many different signaling pathways, such as Wnt/β-catenin, Notch, ROS/JNK, and PI3K/Akt/mTOR are involved in Alzheimer's disease and crosstalk between themselves. A promising treatment involves the uses of ... ...

Abstract	AD is a chronic neurodegenerative disease. Many different signaling pathways, such as Wnt/β-catenin, Notch, ROS/JNK, and PI3K/Akt/mTOR are involved in Alzheimer's disease and crosstalk between themselves. A promising treatment involves the uses of flavonoids, and one of the most promising is curcumin; however, because it has difficulty permeating the blood-brain barrier (BBB), it must be encapsulated by a drug carrier. Some of the most frequently studied are lipid nanocarriers, liposomes, micelles and PLGA. These carriers are further conjugated with brain-targeting agents such as lactoferrin and transferrin. In this review paper, curcumin and its therapeutic effects, which have been examined in vivo, are analyzed and then the delivery systems to the brain are addressed. Overall, the analysis of the literature revealed great potential for curcumin in treating AD and indicated the challenges that require further research.
Language	English
Publishing date	2021-06-16
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma14123332
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Article ; Online: Is 3D Printing Promising for Osteochondral Tissue Regeneration?

Ege, Duygu / Hasirci, Vasif

ACS applied bio materials

2023 Volume 6, Issue 4, Page(s) 1431–1444

Abstract: Osteochondral tissue regeneration is quite difficult to achieve due to the complexity of its organization. In the design of these complex multilayer structures, a fabrication method, 3D printing, started to be employed, especially by using extrusion, ... ...

Abstract	Osteochondral tissue regeneration is quite difficult to achieve due to the complexity of its organization. In the design of these complex multilayer structures, a fabrication method, 3D printing, started to be employed, especially by using extrusion, stereolithography and inkjet printing approaches. In this paper, the designs are discussed including biphasic, triphasic, and gradient structures which aim to mimic the cartilage and the calcified cartilage and the whole osteochondral tissue closely. In the first section of the review paper, 3D printing of hydrogels including gelatin methacryloyl (GelMa), alginate, and polyethylene glycol diacrylate (PEGDA) are discussed. However, their physical and biological properties need to be augmented, and this generally is achieved by blending the hydrogel with other, more durable, less hydrophilic, polymers. These scaffolds are very suitable to carry growth factors, such as TGF-β1, to further stimulate chondrogenesis. The bone layer is mimicked by printing calcium phosphates (CaPs) or bioactive glasses together with the hydrogels or as a component of another polymer layer. The current research findings indicate that polyester (i.e. polycaprolactone (PCL), polylactic acid (PLA) and poly(lactide-
MeSH term(s)	Tissue Scaffolds/chemistry ; Tissue Engineering/methods ; Hydrogels/pharmacology ; Hydrogels/chemistry ; Polyesters/chemistry ; Polymers ; Printing, Three-Dimensional
Chemical Substances	Hydrogels ; Polyesters ; Polymers
Language	English
Publishing date	2023-03-21
Publishing country	United States
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ISSN	2576-6422
ISSN (online)	2576-6422
DOI	10.1021/acsabm.3c00093
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Article ; Online: Bioactive Glass and Silica Particles for Skeletal and Cardiac Muscle Tissue Regeneration.

Ege, Duygu / Lu, Hsuan-Heng / Boccaccini, Aldo R

Tissue engineering. Part B, Reviews

2024

Abstract: When skeletal and cardiac tissues are damaged, surgical approaches are not always successful and tissue regeneration approaches are investigated. Reports in the literature indicate that silica nanoparticles and bioactive glasses (BGs), including silicate ...

Abstract	When skeletal and cardiac tissues are damaged, surgical approaches are not always successful and tissue regeneration approaches are investigated. Reports in the literature indicate that silica nanoparticles and bioactive glasses (BGs), including silicate bioactive glasses (e.g., 45S5 BG), phosphate glass fibers, boron-doped mesoporous BGs, borosilicate glasses, and aluminoborates, are promising for repairing skeletal muscle tissue. Silica nanoparticles and BGs have been combined with polymers to obtain aligned nanofibers and to maintain controlled delivery of nanoparticles for skeletal muscle repair. The literature indicates that cardiac muscle regeneration can be also triggered by the ionic products of BGs. This was observed to be due to the release of vascular endothelial growth factor and other growth factors from cardiomyocytes, which regulate endothelial cells to form capillary structures (angiogenesis). Specific studies, including both
Language	English
Publishing date	2024-02-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	2420584-9
ISSN	1937-3376 ; 1937-3368
ISSN (online)	1937-3376
ISSN	1937-3368
DOI	10.1089/ten.TEB.2023.0277
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Article ; Online: Exploring the effect of chlorhexidine concentration on the biocorrosion behavior of Ti6Al4V for dental implants.

Faramarzi, Masoumeh / Shabgard, Sara / Khalili, Vida / Ege, Duygu

Microscopy research and technique

2024

Abstract: Corrosion of dental implants is one of the most critical factors in the failure of implant treatments. Generally, corrosion depends on the type of material used in implants and the chemical composition of the oral environment. Due to the antibacterial ... ...

Abstract	Corrosion of dental implants is one of the most critical factors in the failure of implant treatments. Generally, corrosion depends on the type of material used in implants and the chemical composition of the oral environment. Due to the antibacterial activities, mouthwashes and chlorhexidine gels are often used after implant surgery. Ti6Al4V is commonly used in manufacturing dental implants. The present study aims to investigate the corrosion behavior of the Ti6Al4V alloy under different concentrations of chlorhexidine (0.12%, 0.2%,and 2%) during 2- and 24-h immersion. This way corrosion may be minimized while obtaining an antibacterial environment around the implant. In this regard, the electrochemical behavior of the specimens was investigated using polarization and impedance tests, and then their morphology, cross-section and nano-tribological behavior were evaluated using atomic force microscopy, scanning electron microscopy, energy dispersive x-ray spectroscopy, and nano-scratch test. The results show that using chlorhexidine solution with a concentration of 0.12% could yield a lower corrosion rate and material loss after implant surgery. RESEARCH HIGHLIGHTS: Open circuit potential values increase with immersion time, which suggests multistage passivation of the surface during immersion in chlorhexidine. Specimens in 0.12% chlorhexidine show improved thermodynamic corrosion resistance. Nano-scratch testing demonstrates higher scratch resistance for specimens in 0.12% chlorhexidine solution after 2-h immersion. Higher chlorhexidine concentration than 0.12% and longer immersion times decrease the resistance of the formed passive layer.
Language	English
Publishing date	2024-03-02
Publishing country	United States
Document type	Journal Article
ZDB-ID	1099714-3
ISSN	1097-0029 ; 1059-910X
ISSN (online)	1097-0029
ISSN	1059-910X
DOI	10.1002/jemt.24538
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Article ; Online: Machine learning models to predict the relationship between printing parameters and tensile strength of 3D Poly (lactic acid) scaffolds for tissue engineering applications.

Ege, Duygu / Sertturk, Seda / Acarkan, Berk / Ademoglu, Ahmet

Biomedical physics & engineering express

2023 Volume 9, Issue 6

Abstract: 3D printing is an effective method to prepare 3D scaffolds for tissue engineering applications. However, optimization of printing conditions to obtain suitable mechanical properties for various tissue engineering applications is costly and time consuming. ...

Abstract	3D printing is an effective method to prepare 3D scaffolds for tissue engineering applications. However, optimization of printing conditions to obtain suitable mechanical properties for various tissue engineering applications is costly and time consuming. To address this problem, in this study, scikit-learn Python machine learning library was used to apply four machine learning-based approaches which are ordinary least squares (OLS) linear regression, random forest (RF), light gradient Boost (LGBM), extreme gradient boosting (XGB) and artificial neural network models to understand the relationship between 3D printing parameters and tensile strength of poly(lactic acid) (PLA). 68 combinations of process parameters for nozzle temperature, printing speed, layer height and tensile strength were used from investigated research papers. Then, datasets were divided as training (80%) and test (20%). After building the OLS linear regression, RF, LGBM, XGB and artificial neural network models, the correlation heatmap and feature importance of each printing parameter for tensile strength values were determined, respectively. Then, the tensile strength was predicted for real datasets to evaluate the performance of the models. The results demonstrate that XGB model was the most successful in predicting tensile strength among the studied models with an
Language	English
Publishing date	2023-10-09
Publishing country	England
Document type	Journal Article
ISSN	2057-1976
ISSN (online)	2057-1976
DOI	10.1088/2057-1976/acf581
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Article ; Online: CNT incorporation improves the resolution and stability of porous 3D printed PLGA/HA/CNT scaffolds for bone regeneration.

Kaya, Hatice / Arıcı, Şule / Bulut, Osman / Bilgili, Fuat / Ege, Duygu

Biomedical materials (Bristol, England)

2023 Volume 18, Issue 5

Abstract: In this study, 3D printed porous poly(lactide-co-glycolide) (PLGA) and its nanocomposites with 5 wt. % hydroxyapatite (HA) and 0.5, 1 and 2 wt. % carboxyl-functionalized multi-walled carbon nanotube (CNT) scaffolds were fabricated by using extrusion- ... ...

Abstract	In this study, 3D printed porous poly(lactide-co-glycolide) (PLGA) and its nanocomposites with 5 wt. % hydroxyapatite (HA) and 0.5, 1 and 2 wt. % carboxyl-functionalized multi-walled carbon nanotube (CNT) scaffolds were fabricated by using extrusion-based printing. The printing parameters were optimized by rheological studies. The rheological studies demonstrated shear thinning properties for all compositions and an increase in storage modulus was observed after the addition of CNT. Porous PLGA/HA/CNT scaffolds were printed by applying a pressure of 4.76 bar at 125 °C. The addition of 0.5 wt. % of CNT reduced the strut size and increased the porosity from 42% to 60%. The increase in storage modulus and decrease in strut size were related to hydrogen bonding between CNT, HA and PLGA which ultimately improved shape fidelity. The scaffolds were characterized by analysis of their chemical structure, water contact angle measurement,
Language	English
Publishing date	2023-09-01
Publishing country	England
Document type	Journal Article
ZDB-ID	2265222-X
ISSN	1748-605X ; 1748-6041
ISSN (online)	1748-605X
ISSN	1748-6041
DOI	10.1088/1748-605X/acf25d
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Article ; Online: Borate Bioactive Glasses (BBG): Bone Regeneration, Wound Healing Applications, and Future Directions.

Ege, Duygu / Zheng, Kai / Boccaccini, Aldo R

ACS applied bio materials

2022 Volume 5, Issue 8, Page(s) 3608–3622

Abstract: Since the early 2000s, borate bioactive glasses (BBGs) have been extensively investigated for biomedical applications. The research so far indicates that BBGs frequently exhibit superior bioactivity and bone healing capacity compared to silicate glasses. ...

Abstract	Since the early 2000s, borate bioactive glasses (BBGs) have been extensively investigated for biomedical applications. The research so far indicates that BBGs frequently exhibit superior bioactivity and bone healing capacity compared to silicate glasses. They are also suitable candidates as drug delivery devices for infection or disease treatment such as osteoporosis. Additionally, BBGs are also an excellent option for wound healing applications, which includes the availability of commercial (FDA approved) microfibrous BBG dressings to treat chronic wounds. By addition of modifying ions, the bone or wound healing capacity of BBGs can be enhanced. For instance, addition of copper ions into BBGs was shown to drastically increase blood vessel formation for wound healing applications. Moreover, addition of ions such as magnesium, strontium, and cobalt improves bone healing. Other recent research interest related to BBGs is focused on nerve and muscle regeneration applications, while cartilage regeneration is also suggested as a potential application field for BBGs. BBGs are commonly produced by melt-quenching; however, sol-gel processing of BBGs is emerging and appears to be a promising alternative. In this review paper, the physical and biological characteristics of BBGs are analyzed based on the available literature, the applications of BBGs are discussed, and future research directions are suggested.
MeSH term(s)	Bone Regeneration ; Borates/pharmacology ; Glass ; Strontium ; Wound Healing
Chemical Substances	Borates ; Strontium (YZS2RPE8LE)
Language	English
Publishing date	2022-07-11
Publishing country	United States
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ISSN	2576-6422
ISSN (online)	2576-6422
DOI	10.1021/acsabm.2c00384
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Article ; Online: Effect of zoledronic acid and graphene oxide on the physical and in vitro properties of injectable bone substitutes.

Demir-Oğuz, Öznur / Ege, Duygu

Materials science & engineering. C, Materials for biological applications

2020 Volume 120, Page(s) 111758

Abstract: The aim of this work was to develop injectable bone substitutes (IBS) consisting of zoledronic acid (ZOL) and graphene oxide (GO) for the treatment of osteoporosis and metastasis. The powder phase was consisting of tetra calcium phosphate (TTCP), ... ...

Abstract	The aim of this work was to develop injectable bone substitutes (IBS) consisting of zoledronic acid (ZOL) and graphene oxide (GO) for the treatment of osteoporosis and metastasis. The powder phase was consisting of tetra calcium phosphate (TTCP), dicalcium phosphate dihyrate (DCPD) and calcium sulfate dihyrate (CSD), while the liquid phase comprised of methylcellulose (MC), gelatin and sodium citrate dihyrate (SC), ZOL and GO. The structural analysis of IBS samples was performed by Fourier Transform Infrared Spectroscopy (FTIR). Injectability, setting time and mechanical strength were investigated. Additionally, in vitro properties of synthesized IBS were analyzed by means of bioactivity, ZOL release, degradation, pH variation, PO
MeSH term(s)	Bone Substitutes ; Compressive Strength ; Graphite ; Zoledronic Acid/pharmacology
Chemical Substances	Bone Substitutes ; graphene oxide ; Zoledronic Acid (6XC1PAD3KF) ; Graphite (7782-42-5)
Language	English
Publishing date	2020-11-27
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2012160-X
ISSN	1873-0191 ; 0928-4931
ISSN (online)	1873-0191
ISSN	0928-4931
DOI	10.1016/j.msec.2020.111758
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Article ; Online: Effect of Boron-Doped Mesoporous Bioactive Glass Nanoparticles on C2C12 Cell Viability and Differentiation: Potential for Muscle Tissue Application.

Ege, Duygu / Nawaz, Qaisar / Beltrán, Ana M / Boccaccini, Aldo R

ACS biomaterials science & engineering

2022 Volume 8, Issue 12, Page(s) 5273–5283

Abstract: Mesoporous bioactive glasses (MBGs) exhibit a high surface area and a highly ordered mesoporous structure. MBGs have potential for both hard and soft tissue engineering applications. MBGs may be doped with biologically active ions to tailor their ... ...

Abstract	Mesoporous bioactive glasses (MBGs) exhibit a high surface area and a highly ordered mesoporous structure. MBGs have potential for both hard and soft tissue engineering applications. MBGs may be doped with biologically active ions to tailor their biological activity. Boron is being widely studied as a dopant of bioactive glasses. Recently, research has demonstrated the potential of boron-containing bioactive glasses for muscle regeneration. In this study, boron-containing MBGs, 10B-MBG and 18B-MBG nanoparticles, were produced by a microemulsion-assisted sol-gel approach for potential muscle regeneration applications. First, X-ray diffraction (XRD), Fourier transform infrared (FTIR), and energy-dispersive X-ray spectroscopy (EDX) analyses were conducted to study the chemical structure and composition of the nanoparticles. To examine the nanoparticle morphology, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images were analyzed. Both SEM images and particle size distribution determined by dynamic light scattering (DLS) indicated a decrease of the average particle size after boron doping. TEM images indicated a slit-shaped mesoporous structure of nanoparticles for all compositions. The ζ potential was measured, and a negative surface charge was found for all study groups due to the presence of silanol groups. Cytocompatibility and fluorescence microscopy studies were also carried out. The results indicated that low concentrations (0.1 and 1 mg mL
Language	English
Publishing date	2022-11-15
Publishing country	United States
Document type	Journal Article
ISSN	2373-9878
ISSN (online)	2373-9878
DOI	10.1021/acsbiomaterials.2c00876
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