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Jeong YH, Choi YH, Kwak DH. Effects of dissolved oxygen changes in the benthic environment on phosphorus flux at the sediment-water interface in a coastal brackish lake. Mar Environ Res 2024; 196:106439. [PMID: 38479292 DOI: 10.1016/j.marenvres.2024.106439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 02/15/2024] [Accepted: 03/07/2024] [Indexed: 03/23/2024]
Abstract
In semi-enclosed coastal brackish lakes, changes in dissolved oxygen in the bottom layer due to salinity stratification can affect the flux of phosphorus (P) at the sediment-water interface, resulting in short- and long-term water quality fluctuations in the water column. In this study, the physicochemical properties of the water layers and sediments at five sites in Saemangeum Lake were analyzed in spring and autumn for four years, and phosphorus release experiments from sediments were conducted for 20 days under oxic and anoxic conditions during the same period. Sediment total phosphorus (T-P) decreased in autumn compared to spring due to mineralization of organic bound phosphorus, which was the most dominant P fraction. This may be related to the increase in the ratio of PO4-P to T-P in bottom waters in autumn, when hypoxia was frequently observed. The difference in P fluxes between oxic and anoxic conditions indicated that during autumn, as compared to spring, the release of phosphorus could have a more immediate impact on the water column during the formation of hypoxia/anoxia. The main factors influencing changes in P fluxes from sediments were identified through redundancy analysis. Additionally, based on the results of multiple regression analysis, sediment TOC, sediment non-apatite phosphorus, porewater pH, and porewater PO4-P were determined to be the most significant factors affecting P fluxes from sediments, depending on the season or redox conditions. Recently, the increased influx of seawater into Saemangeum Lake has been shown to contribute to water quality improvements in the water column due to a strong dilution effect. However, the sediment environment has shifted towards a more reduced state, leading to increased P release under anoxic conditions. Therefore, for future water quality management within the lake, it is necessary to consistently address the recurring hypoxia and continuously monitor phosphorus dynamics.
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Affiliation(s)
- Yong-Hoon Jeong
- Dept. of Bio-Convergence Science, Jeonbuk National University, 9 Cheomdan-ro, Jeongeub, 56212, Republic of Korea
| | - Yong-Ho Choi
- Dept. of Bio-Convergence Science, Jeonbuk National University, 9 Cheomdan-ro, Jeongeub, 56212, Republic of Korea
| | - Dong-Heui Kwak
- Dept. of Bio-Convergence Science, Jeonbuk National University, 9 Cheomdan-ro, Jeongeub, 56212, Republic of Korea; Dept. of Bio-Active Material Science, Jeonbuk National University, 567 Baekjedae-ro, Duckjin-gu, Jeonju, 54896, Republic of Korea.
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Song HG, Ahn JH, Koh JS, Bae JS, Park YW, Hwang SJ, Hwang JY, Jeong YH. Prognostic implication of residual inflammatory risk according to disease status in patients treated with percutaneous coronary intervention. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.1289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Compared with stable angina, acute myocardial infarction (AMI) phenotype is related with the elevated inflammatory activity. However, time-dependent change of inflammatory level and its prognostic implication has not been fully understood according to the disease entity.
Methods
We enrolled total 4,263 patients who underwent percutaneous coronary intervention (PCI) with serial measurement of high-sensitivity C-reactive protein (hsCRP) at on-admission and 1-month post-PCI. The risks of MACE (a composite of death, MI or stroke), and major bleeding were evaluated up to 4 years after procedure.
Results
Compared with the non-AMI group (n=1,887), the AMI group (n=2,376) showed the significant decrease of hs-CRP during 1 month (∇0.5 vs. ∇0.1 mg/L; P<0.001). However, 1-month hs-CRP value still was higher in the AMI group than in the non-AMI group (median: 1.0 vs. 0.9 mg/L; P=0.001). During 1-month follow-up, high vs. low inflammatory risk (upper vs. lower tertile of hs-CRP) was significantly associated with increased rate of MACE in the AMI group (HR: 7.66; 95% CI: 2.29–25.59; P<0.001), but not in the non-AMI group (HR: 0.74; 95% CI: 0.12–4.40; P=0.736). From 1-month to 4-years, patients with high inflammatory risk showed the greater rate of MACE compared to those with low inflammatory risk, in both the AMI (HR: 2.40; 95% CI: 1.73–3.45; P<0.001) and non-AMI (HR: 2.67; 95% CI: 1.80–3.94; P<0.001) groups.
Conclusion
In PCI-treated patients, patients presented with AMI showed the greater values of inflammatory activity and its prognostic implication during the early phase, but combined inflammatory risk appeared similar across the disease entity during the late phase. This result may support that clinical benefit of post-PCI anti-inflammatory treatment would be constant regardless of the disease entity during the stabilized phase.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- H G Song
- Department of Cardiology, Heart-Brain Hospital, Chung-Ang University Gwang-Myeong Medical Center , Gwang-Myeong , Korea (Republic of)
| | - J H Ahn
- Cardiovascular Center, Gyeongsang National University Changwon Hospital , Changwon , Korea (Republic of)
| | - J S Koh
- Cardiovascular Center, Gyeongsang National University Hospital , Jin-Ju , Korea (Republic of)
| | - J S Bae
- Cardiovascular Center, Gyeongsang National University Changwon Hospital , Changwon , Korea (Republic of)
| | - Y W Park
- Cardiovascular Center, Gyeongsang National University Changwon Hospital , Changwon , Korea (Republic of)
| | - S J Hwang
- Cardiovascular Center, Gyeongsang National University Hospital , Jin-Ju , Korea (Republic of)
| | - J Y Hwang
- Cardiovascular Center, Gyeongsang National University Hospital , Jin-Ju , Korea (Republic of)
| | - Y H Jeong
- Department of Cardiology, Heart-Brain Hospital, Chung-Ang University Gwang-Myeong Medical Center , Gwang-Myeong , Korea (Republic of)
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Park JS, Jeong YH. Clinical significance of time-varying on-treatment platelet reactivity after percutaneous coronary intervention. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.1397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Objectives
This study aimed to determine the prognostic value of serial measurement of platelet reactivity (PR) using the VerifyNow, P2Y12 reaction unit (PRU) assay following percutaneous coronary intervention (PCI) during antiplatelet therapy.
Background
On-treatment PR changes over time, but the prognostic value of serial PR measurements has not been defined.
Methods
We enrolled 3204 patients who had PCI and who were measured at PCI and 1 month. We constructed regular and time-dependent Cox proportional hazard models to compare the prognostic value between baseline and serial FU of PR on a primary endpoint of cardiovascular death, myocardial infarction (MI) or stroke over a three-year period.
Results
Time-varying PR and baseline PR were both associated with an increased risk of the primary endpoint, but the duration of association with primary endpoint differed. The prognostic value of time-varying PR (adjusted hazard ratio (HR) 1.008, 95% confidence interval (CI) 1.005–1.011, p=0.001) was rapidly decreased until 3 month and no prognostic value of time-varying PR after 3 month (adjusted HR 0.999, 95% CI 0.997–1.002, p=0.683). Baseline PR was associated with an increased risk of primary endpoint upto 1 year (adjusted HR 1.005, 95% CI 1.003–1.008, p<0.001) and no prognostic value of baseline PR after 1 year (adjusted HR 0.999, 95% CI 0.997–1.002, p=0.827) was not noted, which showed more slow reduction of the prognostic value of baseline PR.
Conclusions
Time-varying on-treatment PR reflects more real-world clinical practice. The prognostic value of PR decreased rapidly after PCI and we have to be cautious to use of single time point for the prediction of clinical event using on-treatment PR.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- J S Park
- Pusan National University Hospital , Pusan , Korea (Republic of)
| | - Y H Jeong
- Chung-Ang University Gwangmyeong Hospital, Chung-Ang University School of Medicine, CAU Thrombosis and Biomarker Center , Gwangmyeong , Korea (Republic of)
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Lee UL, Yun S, Lee H, Cao HL, Woo SH, Jeong YH, Jung TG, Kim CM, Choung PH. Osseointegration of 3D-printed titanium implants with surface and structure modifications. Dent Mater 2022; 38:1648-1660. [PMID: 36075761 DOI: 10.1016/j.dental.2022.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 08/13/2022] [Accepted: 08/18/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND The purpose of this study was to establish a mechanical and histological basis for the development of biocompatible maxillofacial reconstruction implants by combining 3D-printed porous titanium structures and surface treatment. Improved osseointegration of 3D-printed titanium implants for reconstruction of maxillofacial segmental bone defect could be advantageous in not only quick osseointegration into the bone tissue but also in stabilizing the reconstruction. METHODS Various macro-mesh titanium scaffolds were fabricated by 3D-printing. Human mesenchymal stem cells were used for cell attachment and proliferation assays. Osteogenic differentiation was confirmed by quantitative polymerase chain reaction analysis. The osseointegration rate was measured using micro computed tomography imaging and histological analysis. RESULTS In three dimensional-printed scaffold, globular microparticle shape was observed regardless of structure or surface modification. Cell attachment and proliferation rates increased according to the internal mesh structure and surface modification. However, osteogenic differentiation in vitro and osseointegration in vivo revealed that non-mesh structure/non-surface modified scaffolds showed the most appropriate treatment effect. CONCLUSION 3D-printed solid structure is the most suitable option for maxillofacial reconstruction. Various mesh structures reduced osteogenesis of the mesenchymal stem cells and osseointegration compared with that by the solid structure. Surface modification by microarc oxidation induced cell proliferation and increased the expression of some osteogenic genes partially; however, most of the markers revealed that the non-anodized solid scaffold was the most suitable for maxillofacial reconstruction.
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Affiliation(s)
- Ui-Lyong Lee
- Department of Oral & Maxillofacial Surgery, Chung-Ang University Hospital, Seoul 06973, South Korea; Department of Oral & Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, South Korea.
| | - Seokhwan Yun
- Research Institute, Sphebio Co., Ltd., Pohang-si, Gyeongsanbuk 37666, South Korea
| | - Ho Lee
- Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul Metropolitan Government - Seoul National University Boramae Medical Center, Seoul, South Korea
| | - Hua-Lian Cao
- Department of Oral & Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, South Korea
| | - Su-Heon Woo
- R&D Center, Medyssey Co, Ltd, Jechon, Chungcheongbuk-do 27159, South Korea
| | - Yong-Hoon Jeong
- Biomaterial Team, Dept. of Research & Development, Medical Device Development Center/Osong Medical Innovation Foundation, Cheongju, Chungcheongbuk-do 28160, South Korea
| | - Tae-Gon Jung
- Biomaterial Team, Dept. of Research & Development, Medical Device Development Center/Osong Medical Innovation Foundation, Cheongju, Chungcheongbuk-do 28160, South Korea
| | - Chul Min Kim
- Department of Mechatronics, Gyeongsang National University, Jinju-si, Gyeongsangnam-do 52828, South Korea
| | - Pill-Hoon Choung
- Department of Oral & Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, South Korea
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Cho JW, Kim BS, Yeo DH, Lim EJ, Sakong S, Lim J, Park S, Jeong YH, Jung TG, Choi H, Oh CW, Kim HJ, Park JW, Oh JK. 3D-printed, bioactive ceramic scaffold with rhBMP-2 in treating critical femoral bone defects in rabbits using the induced membrane technique. J Orthop Res 2021; 39:2671-2680. [PMID: 33580542 DOI: 10.1002/jor.25007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 12/02/2020] [Accepted: 02/10/2021] [Indexed: 02/04/2023]
Abstract
Although autogenous bone grafts are an optimal filling material for the induced membrane technique, limited availability and complications at the harvest site have created a need for alternative graft materials. We aimed to investigate the effect of an rhBMP-2-coated, 3D-printed, macro/microporous CaO-SiO2 -P2 O5 -B2 O3 bioactive ceramic scaffold in the treatment of critical femoral bone defects in rabbits using the induced membrane technique. A 15-mm segmental bone defect was made in the metadiaphyseal area of the distal femur of 14 rabbits. The defect was filled with polymethylmethacrylate cement and stabilized with a 2.0 mm locking plate. After the membrane matured for 4 weeks, the scaffold was implanted in two randomized groups: Group A (3D-printed bioceramic scaffold) and Group B (3D-printed, bioceramic scaffold with rhBMP-2). Eight weeks after implantation, the radiographic assessment showed that the healing rate of the defect was significantly higher in Group B (7/7, 100%) than in Group A (2/7, 29%). The mean volume of new bone formation around and inside the scaffold doubled in Group B compared to that in Group A. The mean static and dynamic stiffness were significantly higher in Group B. Histological examination revealed newly formed bone in both groups. Extensive cortical bone formation along the scaffold was found in Group B. Successful bone reconstruction in critical-sized bone defects could be obtained using rhBMP-2-coated, 3D-printed, macro/microporous bioactive ceramic scaffolds. This grafting material demonstrated potential as an alternative graft material in the induced membrane technique for reconstructing critical-sized bone defects.
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Affiliation(s)
- Jae-Woo Cho
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
| | - Beom-Soo Kim
- Department of Orthopaedic Surgery, Dongsan Medical Center, School of Medicine, Keimyung University, Daegu, Republic of Korea
| | - Do-Hyun Yeo
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
| | - Eic Ju Lim
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
| | - Seungyeob Sakong
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
| | - Junyoung Lim
- 3D Innovation Center, R&D of 3D Printing Medical Devices on Bio-ceramics, CGBIO, Gyeonggi-do, Republic of Korea
| | - SungNam Park
- 3D Innovation Center, R&D of 3D Printing Medical Devices on Bio-ceramics, CGBIO, Gyeonggi-do, Republic of Korea
| | - Yong-Hoon Jeong
- Department of Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju-si, Republic of Korea
| | - Tae-Gon Jung
- Department of Medical Device Development Center, Osong Medical Innovation Foundation, Cheongju-si, Republic of Korea
| | - Hyuk Choi
- Department of Medical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea
| | - Chang-Wug Oh
- Department of Orthopedic Surgery, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Hak Jun Kim
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
| | - Jong Woong Park
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
| | - Jong-Keon Oh
- Department of Orthopaedic Surgery, Korea University Medical Center, Seoul, Republic of Korea
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Kang MG, Kim KH, Park HW, Koh JS, Park JR, Park YH, Hwang SJ, Jeong YH, Kwak CH, Ahn JH, Song HN, Hwang JY. Impact of active and stable cancer on survival in patients undergoing percutaneous coronary intervention. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.2858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
With advances in treatment of ischemic heart disease and cancer treatment, use of percutaneous coronary intervention (PCI) in cancer survivors and patients with active cancer (AC) is expanding.
Objectives
The purpose of this study was to determine the impact of cancer on survival and major cardiovascular events (MACE) in a long-term, single-center cohort of patients treated with PCI.
Methods
Patients treated with PCI between January 2010 and December 2017 were grouped as follows: controls (patients without cancer), stable cancer (SC), and AC. AC was included patients with cancer diagnosed within the past 6 months, patients who had cancer-related therapy within the past 6 months, active metastatic disease, or active recurrence of the cancer. The primary endpoints were 5-year survival and a secondary endpoint was 5-year MACE.
Results
A total of 6,743 patients (age 66±12 years, 68.4% men) treated with PCI were included: 6,404 (95.0%) controls, 245 (3.6%) SC, and 94 (1.4%) AC. Predominant malignancies were gastrointestinal (37.4%), lung (22.7%), and genitourinary cancer (14.7%). No differences were observed between patients with AC, SC and controls regarding 5-year MACE (total MACE, 33.2% vs. 28.1% vs. 17.5%, p=0.072; cardiac death, 13.6% vs. 9.1% vs. 6.7%, p=0.066; non-fatal myocardial infarction, 2.9% vs. 7.5% vs. 7.8%, p=0.820; revascularization, 17.9% vs. 17.6% vs. 11.6%, p=0.794, respectively). Patients with AC and SC had reduced 5-year survival compared with controls (62.0% vs. 81.5% vs. 89.8%, p<0.001) (Figure). AC was associated with a 1.76 (95% CI 1.22 to 2.54, p=0.002) fold increased risk of all-cause 5-year mortality in multivariable adjusted models.
Conclusions
Cumulative incidence of 5-year survival was discriminated by concurrent status of cancer following PCI. Individualized decision making is needed in the routine practice of PCI regarding concurrent cancer-specific treatment and prognosis.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- M G Kang
- Gyeongsang National University Hospital, Jinju, Korea (Republic of)
| | - K H Kim
- Gyeongsang National University Hospital, Cardiology, Jinju, Korea (Republic of)
| | - H W Park
- Gyeongsang National University Hospital, Cardiology, Jinju, Korea (Republic of)
| | - J S Koh
- Gyeongsang National University Hospital, Cardiology, Jinju, Korea (Republic of)
| | - J R Park
- Gyeongsang National University Hospital, Cardiology, Jinju, Korea (Republic of)
| | - Y H Park
- Gyeongsang National University Changwon Hospital, Changwon, Korea (Republic of)
| | - S J Hwang
- Gyeongsang National University Hospital, Cardiology, Jinju, Korea (Republic of)
| | - Y H Jeong
- Gyeongsang National University Changwon Hospital, Changwon, Korea (Republic of)
| | - C H Kwak
- Gyeongsang National University Changwon Hospital, Changwon, Korea (Republic of)
| | - J H Ahn
- Gyeongsang National University Changwon Hospital, Changwon, Korea (Republic of)
| | - H N Song
- Gyeongsang National University Hospital, Jinju, Korea (Republic of)
| | - J Y Hwang
- Gyeongsang National University Hospital, Cardiology, Jinju, Korea (Republic of)
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Kim MS, Jeong YH, Kwak DH. Modeling behaviors of permeable non-spherical micro-plastic aggregates by aggregation/sedimentation in turbulent freshwater flow. J Hazard Mater 2021; 406:124660. [PMID: 33310332 DOI: 10.1016/j.jhazmat.2020.124660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 11/03/2020] [Accepted: 11/20/2020] [Indexed: 06/12/2023]
Abstract
This study developed and evaluated a behavior model for permeable non-spherical micro-plastic aggregates in a turbulent flow of freshwater based on fractal theory, as conducting experimental and modeling studies. Laboratory-scale experiments evaluated attachment efficiency α to aggregation kinetics in an aquatic environment (pH 6, 20 ℃) of the electrolyte (Al3+). The experimental α was dependent on characteristics of plastics (type, size, and density) and ranged from 0.062 to 0.2772 (averaging 0.1) with a high correlation with the modeled α (R2 > 0.92). Model validation was conducted under two simulation conditions: one drawn from a previously published study of impermeable spherical aggregates and the other based on fractal theory. The simulations verified the limited primary particle size with the lowest retention rate based on the previous study but it was difficult to determine the specific particle size with the lowest retention rate as a limiting factor. The sum of residual errors for aggregation/sedimentation between the two types of structures showed an overestimation of spherical structures. Such overestimation influenced the aggregate number concentration and distribution pattern. Therefore, the model needs to more detailed express the aggregation mechanism of permeable non-spherical aggregate structures in terms of surface growth.
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Affiliation(s)
- Mi-Sug Kim
- School of Environmental Science, Engineering, and Policy, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA
| | - Yong-Hoon Jeong
- Center for Jeongeub Industry-Academy Cooperation, Jeonbuk National University, 9 Cheomdan-ro, Jeongeub 54896, South Korea
| | - Dong-Heui Kwak
- Dept. of Bio-Convergence Science, Jeonbuk National University, 567 Baekjedae-ro, Jeonju, Jeonbuk 54896, South Korea.
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Kim NS, Jeong YH. An investigation of pressure build-up effects due to check valve’s closing characteristics using dynamic mesh techniques of CFD. ANN NUCL ENERGY 2021. [DOI: 10.1016/j.anucene.2020.107996] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Seo JH, Eghan-Acquah E, Kim MS, Lee JH, Jeong YH, Jung TG, Hong M, Kim WH, Kim B, Lee SJ. Comparative Analysis of Stress in the Periodontal Ligament and Center of Rotation in the Tooth after Orthodontic Treatment Depending on Clear Aligner Thickness-Finite Element Analysis Study. Materials (Basel) 2021; 14:ma14020324. [PMID: 33435457 PMCID: PMC7826543 DOI: 10.3390/ma14020324] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/05/2021] [Accepted: 01/06/2021] [Indexed: 02/05/2023]
Abstract
Lately, in orthodontic treatments, the use of transparent aligners for the correction of malocclusions has become prominent owing to their intrinsic advantages such as esthetics, comfort, and minimal maintenance. Attempts at improving upon this technology by varying various parameters to investigate the effects on treatments have been carried out by several researchers. Here, we aimed to investigate the biomechanical and clinical effects of aligner thickness on stress distributions in the periodontal ligament and changes in the tooth's center of rotation. Dental finite element models comprising the cortical and cancellous bones, gingiva, teeth, and nonlinear viscoelastic periodontal ligaments were constructed, validated, and used together with aligner finite element models of different aligner thicknesses to achieve the goal of this study. The finite element analyses were conducted to simulate the actual orthodontic aligner treatment process for the correction of malocclusions by generating pre-stresses in the aligner and allowing the aligner stresses to relax to induce tooth movement. The results of the analyses showed that orthodontic treatment in lingual inclination and axial rotation with a 0.75 mm-thick aligner resulted in 6% and 0.03% higher principal stresses in the periodontal ligament than the same treatment using a 0.05 mm-thick aligner, respectively. Again, for both aligner thicknesses, the tooth's center of rotation moved lingually and towards the root direction in lingual inclination, and diagonally from the long axis of the tooth in axial rotation. Taken together, orthodontic treatment for simple malocclusions using transparent aligners of different thicknesses will produce a similar effect on the principal stresses in the periodontal ligament and similar changes in the tooth's center of rotation, as well as sufficient tooth movement. These findings provide orthodontists and researchers clinical and biomechanical evidence about the effect of transparent aligner thickness selection and its effect on orthodontic treatment.
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Affiliation(s)
- Jeong-Hee Seo
- Medical Device R&D Center, DENTIS Co., Ltd., Daegu 41065, Korea;
- Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea; (E.E.-A.); (M.-S.K.); (J.-H.L.)
| | - Emmanuel Eghan-Acquah
- Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea; (E.E.-A.); (M.-S.K.); (J.-H.L.)
| | - Min-Seok Kim
- Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea; (E.E.-A.); (M.-S.K.); (J.-H.L.)
| | - Jeong-Hyeon Lee
- Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea; (E.E.-A.); (M.-S.K.); (J.-H.L.)
| | - Yong-Hoon Jeong
- Osong Medical Innovation Foundation, Osong 28160, Korea; (Y.-H.J.); (T.-G.J.)
| | - Tae-Gon Jung
- Osong Medical Innovation Foundation, Osong 28160, Korea; (Y.-H.J.); (T.-G.J.)
| | - Mihee Hong
- Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu 41940, Korea;
| | - Won-Hyeon Kim
- Innovative Research & Support Center for Dental Science, Seoul National University Dental Hospital, Seoul 03080, Korea; (W.-H.K.); (B.K.)
| | - Bongju Kim
- Innovative Research & Support Center for Dental Science, Seoul National University Dental Hospital, Seoul 03080, Korea; (W.-H.K.); (B.K.)
- Dental Life Science Research Institute, Seoul National University Dental Hospital, Seoul 03080, Korea
| | - Sung-Jae Lee
- Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea; (E.E.-A.); (M.-S.K.); (J.-H.L.)
- Correspondence: ; Tel.: +82-55-320-3452
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Jang JY, Ahn JH, Bae JS, Kang MG, Kim K, Park HW, Koh JS, Park Y, Hwang SJ, Kwak CH, Hwang JY, Jeong YH. P3637Relationship between serial measurements of NT-proBNP and cardiovascular events in patients with acute coronary syndrome. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Increased level of natriuretic peptides has been known as an important predictors of adverse cardiovascular (CV) outcomes in patients with acute coronary syndrome (ACS). We sought to evaluate clinical implication of N-terminal pro-brain natriuretic peptide (NT-proBNP) measured at initial and follow-up periods.
Methods
Serial NT-proBNP levels (on-admission and one-month post-PCI) were measured in ACS patients undergoing PCI (n=2,290). High NT-proBNP levels were determined according to the predefined age-specific criteria. Patients were stratified into 4 groups according to NT-proBNP levels (on-admission & one-month): (1) normal-normal group (n=1234, 53.9%); (2) high–normal group (n=257, 11.2%); (3) normal-high group (n=376, 16.4%); and (4) high-high group (n=423, 18.5%). Clinical events were defined as all-cause death and MACE (a composite of CV death, non-fatal MI, and ischemic stroke).
Results
With a median follow-up of 35.9 (IQR: 16.8, 54.5) months, all-cause death and MACE were occurred in 4.1% and 7.2%, respectively. NT-proBNP on-admission vs. at one-month did not differ significantly (median 391.6 [IQR: 143.9, 1402.3] vs. median 619.1 [IQR 240.1, 1616.1]; p=0.622), but the prevalence of high NT-proBNP was increased over time (25.3% to 34.9%; p<0.001). The rates of all-cause death and MACE significantly increased only in the high-high group compared with other groups (log-rank test, all p values <0.001, Figure). After adjustment, the high-high group remained significantly risky in terms with the occurrence of all-cause death (HR, 2.99; 95% CI, 1.65 to 5.41; p<0.001) and MACE (HR, 1.96; 95% CI, 1.28 to 3.01; p=0.002).
Figure 1
Conclusion
Serial measurements of NT-proBNP at on-admission and follow-up can help to stratify the risks of all-cause death and adverse CV events following PCI in ACS patients. About two-fifths of patients having high NT-proBNP level during hospitalization can be classified into the low-risk group for all-cause death and adverse CV events.
Acknowledgement/Funding
None
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Affiliation(s)
- J Y Jang
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea (Republic of)
| | - J H Ahn
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea (Republic of)
| | - J S Bae
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea (Republic of)
| | - M G Kang
- Gyeongsang National University Hospital, Internal Medicine, Jinju, Korea (Republic of)
| | - K Kim
- Gyeongsang National University Hospital, Internal Medicine, Jinju, Korea (Republic of)
| | - H W Park
- Gyeongsang National University Hospital, Internal Medicine, Jinju, Korea (Republic of)
| | - J S Koh
- Gyeongsang National University Hospital, Internal Medicine, Jinju, Korea (Republic of)
| | - Y Park
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea (Republic of)
| | - S J Hwang
- Gyeongsang National University Hospital, Internal Medicine, Jinju, Korea (Republic of)
| | - C H Kwak
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea (Republic of)
| | - J Y Hwang
- Gyeongsang National University Hospital, Internal Medicine, Jinju, Korea (Republic of)
| | - Y H Jeong
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea (Republic of)
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11
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Abstract
We investigate the properties of the gap-edge states of half-filled interacting disordered zigzag graphene nanoribbons, and find that the midgap states can display a quantized fractional charge of 1/2. These gap-edge states can be represented by topological kinks with their site probability distribution divided between the left and right zigzag edges with different chiralities. In addition, there are numerous spin-split gap-edge states, similar to those in a Mott-Anderson insulator.
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Affiliation(s)
- Y H Jeong
- Department of Physics, Korea University, Seoul, Republic of Korea
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12
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Kim JH, Baik SH, Song JY, Bae IG, Kim HY, Kim DM, Choi YH, Choi WS, Jeong YH, Kwon HH, Jeong HW, Kim YS, Kim JY, Lee J, Kee SY, Chung JW, Nahm MH, Kim MJ. 1003. Clinical Implications of Emerging Nonvaccine-Serotype Invasive Pneumococcal Disease Among Adults in the Republic of Korea in the Era of Protein-Conjugated Pneumococcal Vaccine. Open Forum Infect Dis 2018. [PMCID: PMC6253861 DOI: 10.1093/ofid/ofy210.840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background In the Republic of Korea (ROK), protein conjugated vaccines (PCV13 and PCV10) in replacement of PCV7 have been used in children since 2010, and then included in the childhood national immunization program (NIP) in 2014. This study investigated indirect effect of PVCs on serotypes in PCV-naïve adult invasive pneumococcal disease (IPD) and its clinical implications. Methods A prospective observational cohort study was conducted, through the serotype surveillance program following the NIP implementation of 23-valent pneumococcal polysaccharide vaccine (PPV23) for elderly population (≥65 years) from 2013 to 2015. Clinical data and pneumococcal isolates from adult IPD patients (≥18 years) were collected from 20 hospitals. Clinical characteristics were compared between vaccine-serotype (VT) and nonvaccine-serotype (NVT) groups. Results Of a total of 319 IPD patients enrolled, 189 cases (59.2%) were available for serotypes. Among them, the proportion of PCV-naïve cases was 99.5% (188/189) and 189 patients consisted of NVT (n = 64, 33.9%) and VT group (n = 125, 66.1%). Compared with the previous study in the ROK (2004–2010), the proportion of PCV13 serotypes was decreased (61.4% vs. 37.0%, P < 0.001) and PPV23 serotypes were stationary (71.5% vs. 65.6%), but NVT serotypes were increased (23.4% vs. 33.9%, P = 0.033) in our study. The most common serotype was 3 (20.8%) and 34 (23.4%) in VT and NVT group, respectively. VT group had more bacteremic pneumonia (72.0% vs. 48.4%, P = 0.002). There was no difference of the case fatality rate between NVT and VT groups (29.7% vs. 35.2%, P = 0.447). Multiple logistic regression analysis showed that chronic kidney disease (odds ratio [OR] 10.26, 95% confidence interval [CI] 1.94–54.44, P = 0.006), younger age of 18–49 years (OR 4.04, 95% CI 1.29–12.71, P = 0.017), deep-seated infection (OR 3.73, 95% CI 1.34–10.39, P = 0.012), meropenem resistance (OR 3.21, 95% CI 1.49–6.91, P = 0.003) were significantly associated with NVT-IPD cases. Conclusion Our study indicates that emerging and expanding NVT-IPD among adults, probably due to indirect herd effect of widespread use of pediatric PCV. Further changes of IPD serotypes might occur and IPD serotypes should be monitored for developing better pneumococcal vaccination policy. Disclosures All authors: No reported disclosures.
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Affiliation(s)
- Jong Hun Kim
- Division of Infectious Diseases, Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Seung Hee Baik
- Cheju Halla General Hospital, Jeju-si, Korea, Republic of (South)
| | - Joon Young Song
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - In-Gyu Bae
- Gyeongsang National University Hospital, Jinju, Korea, Republic of (South)
| | - Hyo Youl Kim
- Division of Infectious Diseases, Yonsei University Wonju College of Medicine, Wonju, Korea, Republic of (South)
| | - Dong-Min Kim
- School of Medicine, Chosun University, gwang ju, Korea, Republic of (South)
| | - Young Hwa Choi
- Department of Infectious Diseases, Ajou University School of Medicine, Suwon, Korea, Republic of (South)
| | - Won Suk Choi
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Y H Jeong
- Konyang University Hospital, Daejon, Korea, Republic of (South)
| | - Hyun Hee Kwon
- Infectious Disease, Catholic University of Daegu School of Medicine, Daegu, Korea, Republic of (South)
| | - Hye Won Jeong
- Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea, Republic of (South)
| | - Yeon-Sook Kim
- Chungnam National University School Of Medicine, Daejon, Korea, Republic of (South)
| | - Jeong Yeon Kim
- Sahmyook Medical Center, Seoul, Korea, Republic of (South)
| | - Jacob Lee
- Department of Internal Medicine, Hallym University Medical Center, Seoul, Korea, Republic of (South)
| | - Sae Yoon Kee
- Keonkuk University Hospital, Chungju, Korea, Republic of (South)
| | - Jin-Won Chung
- Department of Internal Medicine, Chung-Ang University Medical Center, Seoul, Korea, Republic of (South)
| | - Moon H Nahm
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Min-Ja Kim
- Division of Infectious Disease, Depart of Internal Medicine, Korea University Medical Center, Seoul, Korea, Republic of (South)
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13
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Kim JH, Chun BC, Song JY, Kim HY, Bae IG, Kim DM, Choi WS, Jeong YH, Choi YH, Kang SH, Yoon YK, Sohn JW, Kim MJ. 744. Effectiveness of 23-Valent Pneumococcal Polysaccharide Vaccine and Influenza Vaccine Against Pneumococcal Pneumonia Among Elderly Patients Aged 65 Years and Older in the Republic of Korea: A Case–Control Study. Open Forum Infect Dis 2018. [PMCID: PMC6255674 DOI: 10.1093/ofid/ofy210.751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background The national immunization program (NIP) of annual influenza vaccination to the elderly population (≥65 years of age) in the Republic of Korea (ROK) has been implemented since 1987. Recently, the 23-valent pneumococcal polysaccharide vaccine (PPV23) through the NIP has been provided to the elderly population in the ROK since May 2013. The aim of this study was to assess PPV23 and influenza vaccine (IV) effectiveness in preventing pneumococcal pneumonia (PP) among elderly patients ≥65 years of age. Methods A case–control study using a hospital-based cohort was conducted. Cases of PP including bacteremic PP and nonbacteremic PP were collected from 14 hospitals in the pneumococcal diseases surveillance program from March 2013 to October 2015. Controls matched by age and sex in the same hospital were selected. Demographic, clinical information, and vaccination histories were collected. Previous immunization was categorized into “vaccinated” if a patient had received vaccines as follows: PPV23 (4 weeks to 5 years) and IV (2 weeks to 6 months) prior to the diagnosis of PP for case patients and prior to the hospital admission for control patients. Adjusted odds ratio (OR) was calculated, controlling for underlying medical conditions. Vaccine effectiveness was defined as (1 – OR) × 100. Results During the study period, a total of 661 cases (104 bacteremic PP cases and 557 nonbacteremic PP cases) and 661 controls were enrolled for analyses. For overall patients ≥65 years of age, there was no significant vaccine effectiveness against PP. For young elderly patients with 65–74 years, IV alone (1.2%, [95% confidence interval (CI) −95.3% to 50.0%]) and PPV23 alone (21.9%, [95% CI −39.0% to 56.1%]) were not effective. However, significant vaccine effectiveness of PPV23 plus IV against PP was noted (54.4%, [95% CI 6.9–77.7%], P = 0.031). For older elderly patients ≥75 years of age, no significant vaccine effectiveness was observed. Conclusion Our study indicates that PPV23 plus IV may be effective in preventing PP among young elderly patients with 65–74 years, suggesting additive benefits of influenza plus PPV23 vaccination. Further studies are required to confirm the persistent additive protective effectiveness. Disclosures All authors: No reported disclosures.
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Affiliation(s)
- Jong Hun Kim
- Division of Infectious Diseases, Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Byung Chul Chun
- Preventive Medicine, Korea University Coll. of Med., Seoul, Korea, Republic of (South)
| | - Joon Young Song
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Hyo Youl Kim
- Division of Infectious Diseases, Yonsei University Wonju College of Medicine, Wonju, Korea, Republic of (South)
| | - In-Gyu Bae
- Gyeongsang National University Hospital, Jinju, Korea, Republic of (South)
| | - Dong-Min Kim
- School of Medicine, Chosun University, Gwang Ju, Korea, Republic of (South)
| | - Won Suk Choi
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Y H Jeong
- Konyang University Hospital, Daejon, Korea, Republic of (South)
| | - Young Hwa Choi
- Department of Infectious Diseases, Ajou University School of Medicine, Suwon, Korea, Republic of (South)
| | - Seong Hui Kang
- Konyang University Hospital, Daejon, Korea, Republic of (South)
| | - Young Kyung Yoon
- Division of Infectious Disease, Depart of Internal Medicine, Korea University Medical Center, Seoul, Korea, Republic of (South)
| | - Jang-Wook Sohn
- Division of Infectious Disease, Depart of Internal Medicine, Korea University Medical Center, Seoul, Korea, Republic of (South)
| | - Min-Ja Kim
- Division of Infectious Disease, Depart of Internal Medicine, Korea University Medical Center, Seoul, Korea, Republic of (South)
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14
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Jeong YH, Yang SRE. Topological Gap States of Rectangular Armchair Ribbon. J Nanosci Nanotechnol 2018; 18:6142-6146. [PMID: 29677757 DOI: 10.1166/jnn.2018.15619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We consider a rectangular graphene armchair ribbon with an excitation gap. The boundary of this system consists of two short zigzag edges and two long armchair edges. Within such a ribbon, topological gap states exist that are localized along the zigzag edges. The end charge of these states is an integer, which can be related to the Zak phase of the periodic armchair ribbon constructed from the rectangular armchair ribbon by connecting its zigzag edges together. In this paper, we provide an explicit analytical computation of the Zak phase of a periodic armchair ribbon, and show that its value is consistent with the integer end charges that are computed numerically. In the presence of a staggered potential, non-integer end charges are possible. We discuss its relation to the Zak phase.
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Affiliation(s)
- Y H Jeong
- Department of Physics, Korea University, Seoul, 02841, Korea
| | - S R Eric Yang
- Department of Physics, Korea University, Seoul, 02841, Korea
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15
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Johnson TB, Siderits B, Nye S, Jeong YH, Han SH, Rhyu IC, Han JS, Deguchi T, Beck FM, Kim DG. Effect of guided bone regeneration on bone quality surrounding dental implants. J Biomech 2018; 80:166-170. [PMID: 30170838 DOI: 10.1016/j.jbiomech.2018.08.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 08/13/2018] [Accepted: 08/14/2018] [Indexed: 11/27/2022]
Abstract
Bone quality as well as its quantity at the implant interface is responsible for determining stability of the implant system. The objective of this study is to examine the nanoindentation based elastic modulus (E) at different bone regions adjacent to titanium dental implants with guided bone regeneration (GBR) treated with DBM and BMP-2 during different post-implantation periods. Six adult male beagle dogs were used to create circumferential defects with buccal bone removal at each implantation site of mandibles. The implant systems were randomly assigned to only GBR (control), GBR with demineralized bone matrix (DBM), and GBR with DBM + recombinant human bone morphogenetic protein-2 (rhBMP-2) (BMP) groups. Three animals were sacrificed at each 4 and 8 weeks of post-implantation healing periods. Following buccolingual dissection, the E values were assessed at the defects (Defect), interfacial bone tissue adjacent to the implant (Interface), and pre-existing bone tissue away from the implant (Pre-existing). The E values of BMP group had significantly higher than control and DBM groups for interface and defect regions at 4 weeks of post-implantation period and for the defect region at 8 weeks (p < 0.043). DBM group had higher E values than control group only for the defect region at 4 weeks (p < 0.001). The current results indicate that treatment of rhBMP-2 with GBR accelerates bone tissue mineralization for longer healing period because the GBR likely facilitates a microenvironment to provide more metabolites with open space of the defect region surrounding the implant.
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Affiliation(s)
- Trenton B Johnson
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Ben Siderits
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Seth Nye
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Seung-Hee Han
- Periodontology, Department of Dental Science, Graduate School, Seoul National University, Seoul, South Korea
| | - In-Chul Rhyu
- Periodontology, Department of Dental Science, Graduate School, Seoul National University, Seoul, South Korea
| | - Jung-Suk Han
- Prosthodontics, Department of Dental Science, Graduate School, Seoul National University, Seoul, South Korea
| | - Toru Deguchi
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - F Michael Beck
- Division of Oral Bioscience, College of Dentistry, Ohio State University, Columbus, OH, USA
| | - Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA.
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16
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Park YW, Jeong YH, Hwang JY, Kwack CH, Hwang SJ. P1714Risk stratification for ischemic and bleeding events in patients using a potent P2Y12 inhibitor. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Y W Park
- Gyeongsang National University Hospital, Jinju, Korea Republic of
| | - Y H Jeong
- Gyeongsang National University Hospital, Jinju, Korea Republic of
| | - J Y Hwang
- Gyeongsang National University Hospital, Jinju, Korea Republic of
| | - C H Kwack
- Gyeongsang National University Hospital, Jinju, Korea Republic of
| | - S J Hwang
- Gyeongsang National University Hospital, Jinju, Korea Republic of
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17
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Park YW, Jeong YH, Kim JH, Sohn SN, Kwack CH, Hwang JY. P810Histologic comparison of intracerebral and intracoronary thrombi. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Y W Park
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea Republic of
| | - Y H Jeong
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea Republic of
| | - J H Kim
- Gyeongsang National University Hospital, Biomedical Research Institute, Jinju, Korea Republic of
| | - S N Sohn
- Hanil Hospital, Neurology, Jinju, Korea Republic of
| | - C H Kwack
- Gyeongsang National University Changwon Hospital, Internal Medicine, Changwon, Korea Republic of
| | - J Y Hwang
- Gyeongsang National University Hospital, Jinju, Korea Republic of
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18
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Kim DG, Jeong YH, McMichael BK, Bähler M, Bodnyk K, Sedlar R, Lee BS. Relationships of bone characteristics in MYO9B deficient femurs. J Mech Behav Biomed Mater 2018; 84:99-107. [PMID: 29754047 DOI: 10.1016/j.jmbbm.2018.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 04/06/2018] [Accepted: 05/02/2018] [Indexed: 12/15/2022]
Abstract
The objective of this study was to examine relationships among a variety of bone characteristics, including volumetric, mineral density, geometric, dynamic mechanical analysis, and static fracture mechanical properties. As MYO9B is an unconventional myosin in bone cells responsible for normal skeletal growth, bone characteristics of wild-type (WT), heterozygous (HET), and MYO9B knockout (KO) mice groups were compared as an animal model to express different bone quantity and quality. Forty-five sex-matched 12-week-old mice were used in this study. After euthanization, femurs were isolated and scanned using microcomputed tomography (micro-CT) to assess bone volumetric, tissue mineral density (TMD), and geometric parameters. Then, a non-destructive dynamic mechanical analysis (DMA) was performed by applying oscillatory bending displacement on the femur. Finally, the same femur was subject to static fracture testing. KO group had significantly lower length, bone mineral density (BMD), bone mass and volume, dynamic and static stiffness, and strength than WT and HET groups (p < 0.019). On the other hand, TMD parameters of KO group were comparable with those of WT group. HET group showed volumetric, geometric, and mechanical properties similar to WT group, but had lower TMD (p < 0.014). Non-destructive micro-CT and DMA parameters had significant positive correlations with strength (p < 0.015) without combined effect of groups and sex on the correlations (p > 0.077). This comprehensive characterization provides a better understanding of interactive behavior between the tissue- and organ-level of the same femur. The current findings elucidate that MYO9B is responsible for controlling bone volume to determine the growth rate and fracture risk of bone.
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Affiliation(s)
- Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA.
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Brooke K McMichael
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - Martin Bähler
- Institute of Molecular Cell Biology, University of Münster, Germany
| | - Kyle Bodnyk
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Ryan Sedlar
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Beth S Lee
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
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19
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McMichael BK, Jeong YH, Auerbach JA, Han CM, Sedlar R, Shettigar V, Bähler M, Agarwal S, Kim DG, Lee BS. The RhoGAP Myo9b Promotes Bone Growth by Mediating Osteoblastic Responsiveness to IGF-1. J Bone Miner Res 2017; 32:2103-2115. [PMID: 28585695 DOI: 10.1002/jbmr.3192] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 05/26/2017] [Accepted: 06/05/2017] [Indexed: 12/31/2022]
Abstract
The Ras homolog A (RhoA) subfamily of Rho guanosine triphosphatases (GTPases) regulates actin-based cellular functions in bone such as differentiation, migration, and mechanotransduction. Polymorphisms or genetic ablation of RHOA and some of its regulatory guanine exchange factors (GEFs) have been linked to poor bone health in humans and mice, but the effects of RhoA-specific GTPase-activating proteins (GAPs) on bone quality have not yet been identified. Therefore, we examined the consequences of RhoGAP Myo9b gene knockout on bone growth, phenotype, and cellular activity. Male and female mice lacking both alleles demonstrated growth retardation and decreased bone formation rates during early puberty. These mice had smaller, weaker bones by 4 weeks of age, but only female KOs had altered cellular numbers, with fewer osteoblasts and more osteoclasts. By 12 weeks of age, bone quality in KOs worsened. In contrast, 4-week-old heterozygotes demonstrated bone defects that resolved by 12 weeks of age. Throughout, Myo9b ablation affected females more than males. Osteoclast activity appeared unaffected. In primary osteogenic cells, Myo9b was distributed in stress fibers and focal adhesions, and its absence resulted in poor spreading and eventual detachment from culture dishes. Similarly, MC3T3-E1 preosteoblasts with transiently suppressed Myo9b levels spread poorly and contained decreased numbers of focal adhesions. These cells also demonstrated reduced ability to undergo IGF-1-induced spreading or chemotaxis toward IGF-1, though responses to PDGF and BMP-2 were unaffected. IGF-1 receptor (IGF1R) activation was normal in cells with diminished Myo9b levels, but the activated receptor was redistributed from stress fibers and focal adhesions into nuclei, potentially affecting receptor accessibility and gene expression. These results demonstrate that Myo9b regulates a subset of RhoA-activated processes necessary for IGF-1 responsiveness in osteogenic cells, and is critical for normal bone formation in growing mice. © 2017 American Society for Bone and Mineral Research.
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Affiliation(s)
| | - Yong-Hoon Jeong
- College of Dentistry, The Ohio State University, Columbus, OH, USA
| | | | - Cheol-Min Han
- College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Ryan Sedlar
- College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Vikram Shettigar
- College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Martin Bähler
- Institut für Molekulare Zellbiologie, Universität Münster, Münster, Germany
| | - Sudha Agarwal
- College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Do-Gyoon Kim
- College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Beth S Lee
- College of Medicine, The Ohio State University, Columbus, OH, USA
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20
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Kim JJ, Jeong YH, Choe HC. Phenomena of Nano- and Micro-Pore Formation on Ti-(10~50)Ta Alloys by Plasma Electrolytic Oxidation for Dental Implants. J Nanosci Nanotechnol 2017; 17:2285-2290. [PMID: 29638290 DOI: 10.1166/jnn.2017.13334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, the phenomena of nano and micro-pore formation on Ti-(10~50)Ta alloys by plasma electrolytic oxidation for dental implants was investigated using various experimental techniques. The Ti–xTa alloys having Ta contents of 10, 30, and 50 wt.% were prepared using arc-melting vacuum furnace. Micro-pore formation was performed using a potentiostat in 1 M H₃PO₄ electrolyte by using a potentiostat at various applied voltage (180 V, 210 V, and 240 V). The microstructure of Ti–xTa alloys changed from α′ phase to β + α″ phase with Ta content increased. The applied potential increased, the numbers of micro-pore per unit area decreased, whereas the area ratio of occupied by micro-pores increased. The Ta contents increased, the numbers of micro-pore per unit area decreased, whereas the area ratio of occupied by micro-pores increased at 210 V and 240 V. The thickness of oxide layer and micro-pore size can be controlled by applied potential.
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21
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Lee J, Jeong YH, Pittman J, Deguchi T, Johnston WM, Fields HW, Kim DG. Primary stability and viscoelastic displacement of mini-implant system under loading. Clin Biomech (Bristol, Avon) 2017; 41:28-33. [PMID: 27915135 DOI: 10.1016/j.clinbiomech.2016.11.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 10/19/2016] [Accepted: 11/21/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND The objectives of the current study were to examine the effects of mini-implant diameters on 1) primary stability before bone properties are changed by active peri-implant bone remodeling and 2) the time-dependent displacement of mini-implant systems in bone under a functional radial loading and their associations with bone mineral density. METHODS Twenty one, 8mm length mini-implants (7 each for 1.4mm, 1.6mm, and 2mm diameters) were placed in mandibular sections of human cadavers (4 males and 3 females, average 69.7 (SD 13.1) years of age). Displacement of the mini-implant in wet bone was assessed during initial and subsequent continuous radial loading of 2N in the mediolateral direction for 2h. Mean, standard deviation and coefficient of variation of peri-implant bone mineral density were obtained using histograms of cone-beam computed tomography attenuation values. The cortical thickness along with the miniscrew site was also measured. FINDINGS The primary stability and displacement of mini-implants in bone were not significantly different between the 3 diameter groups (p>0.147, n=21). Moderate positive correlations of time-dependent viscoelastic displacement (creep) were found with bone mineral density variability independent of the mini-implant diameters (p>0.11). INTERPRETATION The post-implantation displacements of mini-implant suggested that the orthodontic treatment loading can develop micromotion between the mini-implant and surrounding bone leading to reduction of its primary stability. Current findings also provide an insight that peri-implant bone mineral density variability plays an important role in controlling displacement of the mini-implant, which determine its stability during early and prolonged orthodontic treatment loading periods.
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Affiliation(s)
- Jim Lee
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Joseph Pittman
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Toru Deguchi
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - William M Johnston
- Division of General Practice and Materials Science, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Henry W Fields
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA.
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Choi JS, Jin SK, Jeong YH, Jung YC, Jung JH, Shim KS, Choi YI. Relationships between Single Nucleotide Polymorphism Markers and Meat Quality Traits of Duroc Breeding Stocks in Korea. Asian-Australas J Anim Sci 2016; 29:1229-38. [PMID: 27507182 PMCID: PMC5003982 DOI: 10.5713/ajas.16.0158] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 06/09/2016] [Accepted: 08/10/2016] [Indexed: 11/27/2022]
Abstract
This study was conducted to determine the relationships of five intragenic single nucleotide polymorphism (SNP) markers (protein kinase adenosine monophosphate-activated γ3 subunit [PRKAG3], fatty acid synthase [FASN], calpastatin [CAST], high mobility group AT-hook 1 [HMGA1], and melanocortin-4 receptor [MC4R]) and meat quality traits of Duroc breeding stocks in Korea. A total of 200 purebred Duroc gilts from 8 sires and 40 dams at 4 pig breeding farms from 2010 to 2011 reaching market weight (110 kg) were slaughtered and their carcasses were chilled overnight. Longissimus dorsi muscles were removed from the carcass after 24 h of slaughter and used to determine pork properties including carcass weight, backfat thickness, moisture, intramuscular fat, pH24h, shear force, redness, texture, and fatty acid composition. The PRKAG3, FASN, CAST, and MC4R gene SNPs were significantly associated with the meat quality traits (p<0.003). The meats of PRKAG3 (A 0.024/G 0.976) AA genotype had higher pH, redness and texture than those from PRKAG3 GG genotype. Meats of FASN (C 0.301/A 0.699) AA genotype had higher backfat thickness, texture, stearic acid, oleic acid and polyunsaturated fatty acid than FASN CC genotype. While the carcasses of CAST (A 0.373/G 0.627) AA genotype had thicker backfat, and lower shear force, palmitoleic acid and oleic acid content, they had higher stearic acid content than those from the CAST GG genotype. The MC4R (G 0.208/A 0.792) AA genotype were involved in increasing backfat thickness, carcass weight, moisture and saturated fatty acid content, and decreasing unsaturated fatty acid content in Duroc meat. These results indicated that the five SNP markers tested can be a help to select Duroc breed to improve carcass and meat quality properties in crossbred pigs.
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Affiliation(s)
- J S Choi
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea.,Department of Animal Resources Technology and Swine Science & Technology Center, Gyeongnam National University of Science and Technology, Jinju 660-758, Korea
| | - S K Jin
- Department of Animal Resources Technology and Swine Science & Technology Center, Gyeongnam National University of Science and Technology, Jinju 660-758, Korea
| | - Y H Jeong
- Hanwoo Department, Korea Animal Improvement Association, Seoul 137-871, Korea
| | - Y C Jung
- Jung P&C Institute, Yongin 446-982, Korea
| | - J H Jung
- Jung P&C Institute, Yongin 446-982, Korea
| | - K S Shim
- Department of Animal Biotechnology, Chunbuk National University, Jeonju 561-756, Korea
| | - Y I Choi
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
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Kim JJ, Alapati S, Knoernschild KL, Jeong YH, Kim DG, Lee DJ. Micro-Computed Tomography of Tooth Volume Changes Following Post Removal. J Prosthodont 2016; 26:522-528. [DOI: 10.1111/jopr.12442] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2015] [Indexed: 11/29/2022] Open
Affiliation(s)
- Jiyeon J. Kim
- Department of Restorative Dentistry; University of Illinois at Chicago College of Dentistry; Chicago IL
| | - Satish Alapati
- Department of Endodontics; University of Illinois at Chicago College of Dentistry; Chicago IL
| | - Kent L. Knoernschild
- Department of Restorative Dentistry; University of Illinois at Chicago College of Dentistry; Chicago IL
| | - Yong-Hoon Jeong
- Division of Orthodontics; The Ohio State University College of Dentistry; Columbus OH
| | - Do Gyoon Kim
- Division of Orthodontics; The Ohio State University College of Dentistry; Columbus OH
| | - Damian J. Lee
- Division of Restorative Sciences and Prosthodontics; The Ohio State University College of Dentistry; Columbus OH
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Jeong YH, Kim JJ, Choe HC. Surface Characteristics of Nano-Structured Silicon/Hydroxyapatite Deposition onto the Ti-Nb-Zr Alloy. J Nanosci Nanotechnol 2016; 16:1783-1786. [PMID: 27433670 DOI: 10.1166/jnn.2016.11926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The Ti-Nb-Zr alloy was manufactured with 35 wt% of Nb and 10 wt% of Zr by arc melting furnace to be a beta phase. Electrochemical deposition of Si substituted Ca/P was performed by pulsing the potential with a method of cyclic voltammetry, and changed cyclic time between 10, 30, 70, and 150. The electrolyte was prepared by dissolving the reagent-grade chemicals: Ca(NO3)2, NH4H2PO4, and Na2SiO3 x 9H20 to be 1.67 of Ca/P ratio and silicon contents were controlled to be 1 wt%. The surface characteristics were observed by field-emission scanning electron microscopy, X-ray diffractometer, and electrochemical corrosion as a potentiodynamic test. The Si substituted hydroxyapatite layer was successfully formed on the Ti-35Nb-10Zr alloy substrate by electrochemical deposition. A surface morphologies showed needle like shape at 10 cycles, then changed to be a circular with increment of cycles. The Ca/P ratio was the range between 1.5 and 2.0, the crystalline of hydroxyapatite could be confirmed. The corrosion behavior of Si-HA deposition was related with surface shape and thickness by increment, of cyclic times. Higher cyclic times of deposition had higher corrosion potential and current density than that of lower cyclic surface.
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Kim DG, Elias KL, Jeong YH, Kwon HJ, Clements M, Brantley WA, Lee DJ, Han JS. Differences between buccal and lingual bone quality and quantity of peri-implant regions. J Mech Behav Biomed Mater 2016; 60:48-55. [PMID: 26773652 DOI: 10.1016/j.jmbbm.2015.12.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 12/22/2015] [Accepted: 12/23/2015] [Indexed: 10/22/2022]
Abstract
The objective of the current study was to examine whether peri-implant bone tissue properties are different between the buccal and lingual regions treated by growth factors. Four dental implant groups were used: titanium (Ti) implants, alumina-blasted zirconia implants (ATZ-N), alumina-blasted zirconia implants with demineralized bone matrix (DBM) (ATZ-D), and alumina-blasted zirconia implants with rhBMP-2 (ATZ-B). These implants were placed in mandibles of six male dogs. Nanoindentation elastic modulus (E) and plastic hardness (H) were measured for the buccal and lingual bone tissues adjacent and away from the implants at 3 and 6 weeks post-implantation. A total of 2281 indentations were conducted for 48 placed implants. The peri-implant buccal region had less bone quantity resulting from lower height and narrower width of bone tissue than the lingual region. Buccal bone tissues had significant greater mean values of E and H than lingual bone tissues at each distance and healing period (p<0.007). Nearly all implant treatment groups displayed lower mean values of the E at the lingual bone tissues than at the buccal bone tissues (p<0.046) although the difference was not significant for the Ti implant group (p=0.758). The DBM and rhBMP-2 treatments stimulated more peri-implant bone remodeling at the lingual region, producing more immature new bone tissues with lower E than at the buccal region. This finding suggests that the growth factor treatments to the zirconia implant system may help balance the quantity and quality differences between the peri-implant bone tissues.
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Affiliation(s)
- Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA.
| | - Kathy L Elias
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Hyun-Jung Kwon
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Matthew Clements
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - William A Brantley
- Division of Restorative Science and Prosthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Damian J Lee
- Division of Restorative Science and Prosthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Jung-Suk Han
- Department of Prosthodontics, Seoul National University, Seoul, Republic of Korea
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Kim SC, Jeong YH, Yang SRE. Stability of Anomalous States of a Local Potential in Graphene. J Nanosci Nanotechnol 2015; 15:8263-8266. [PMID: 26726499 DOI: 10.1166/jnn.2015.11251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Graphene Landau levels have discrete energies consisting zero energy chiral states and non-zero energy states with mixed chirality. Each Landau level splits into discrete energies when a localized potential is present. A simple scaling analysis suggests that a localized potential can act as a strong perturbation, and that it can be even more singular in graphene than in ordinary two-dimensional systems of massful electrons. Parabolic, Coulomb, and Gaussian potentials in graphene may have anomalous boundstates whose probability density has a sharp peak inside the potential and a broad peak of size magnetic length l outside the potential. The n = 0 Landau level with zero energy has only one anomalous state while the n = ±1 Landau levels with non-zero energy have two (integer quantum number n is related to the quantized Landau level energies). These anomalous states can provide a new magnetospectroscopic feature in impurity cyclotron resonances of graphene. In the present work we investigate quantitatively the conditions under which the anomalous states can exist. These results may provide a guide in searching for anomalous states experimentally.
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Nam J, Perera P, Gordon R, Jeong YH, Blazek AD, Kim DG, Tee BC, Sun Z, Eubank TD, Zhao Y, Lablebecioglu B, Liu S, Litsky A, Weisleder NL, Lee BS, Butterfield T, Schneyer AL, Agarwal S. Follistatin-like 3 is a mediator of exercise-driven bone formation and strengthening. Bone 2015; 78:62-70. [PMID: 25937185 PMCID: PMC4466155 DOI: 10.1016/j.bone.2015.04.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 04/15/2015] [Accepted: 04/24/2015] [Indexed: 11/17/2022]
Abstract
Exercise is vital for maintaining bone strength and architecture. Follistatin-like 3 (FSTL3), a member of follistatin family, is a mechanosensitive protein upregulated in response to exercise and is involved in regulating musculoskeletal health. Here, we investigated the potential role of FSTL3 in exercise-driven bone remodeling. Exercise-dependent regulation of bone structure and functions was compared in mice with global Fstl3 gene deletion (Fstl3-/-) and their age-matched Fstl3+/+ littermates. Mice were exercised by low-intensity treadmill walking. The mechanical properties and mineralization were determined by μCT, three-point bending test and sequential incorporation of calcein and alizarin complexone. ELISA, Western-blot analysis and qRT-PCR were used to analyze the regulation of FSTL3 and associated molecules in the serum specimens and tissues. Daily exercise significantly increased circulating FSTL3 levels in mice, rats and humans. Compared to age-matched littermates, Fstl3-/- mice exhibited significantly lower fracture tolerance, having greater stiffness, but lower strain at fracture and yield energy. Furthermore, increased levels of circulating FSTL3 in young mice paralleled greater strain at fracture compared to the lower levels of FSTL3 in older mice. More significantly, Fstl3-/- mice exhibited loss of mechanosensitivity and irresponsiveness to exercise-dependent bone formation as compared to their Fstl3+/+ littermates. In addition, FSTL3 gene deletion resulted in loss of exercise-dependent sclerostin regulation in osteocytes and osteoblasts, as compared to Fstl3+/+ osteocytes and osteoblasts, in vivo and in vitro. The data identify FSTL3 as a critical mediator of exercise-dependent bone formation and strengthening and point to its potential role in bone health and in musculoskeletal diseases.
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Affiliation(s)
- J Nam
- Department of Bioengineering, University of California, Riverside, CA 92507, USA.
| | - P Perera
- Division of Biosciences, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - R Gordon
- Division of Biosciences, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - Y H Jeong
- Division of Orthodontics, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - A D Blazek
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, USA
| | - D G Kim
- Division of Orthodontics, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - B C Tee
- Division of Orthodontics, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - Z Sun
- Division of Orthodontics, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - T D Eubank
- Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Y Zhao
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - B Lablebecioglu
- Division of Periodontics, The Ohio State University College of Dentistry, Columbus, OH 43210, USA
| | - S Liu
- Hormel Institute, University of Minnesota, MN 55901, USA
| | - A Litsky
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH 43210, USA; Department of Orthopedics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - N L Weisleder
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, USA
| | - B S Lee
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, USA
| | - T Butterfield
- Department of Physiology, University of Kentucky, Lexington, KY 40536, USA
| | - A L Schneyer
- Department of Veterinary and Animal Science, University of Massachusetts-Amherst, MA 01003, USA
| | - S Agarwal
- Division of Biosciences, The Ohio State University College of Dentistry, Columbus, OH 43210, USA; Department of Orthopedics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
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Jeong YH, Choe HC. Electrochemical Deposition of Si-Ca/P on Nanotube Formed Beta Ti Alloy by Cyclic Voltammetry Method. J Nanosci Nanotechnol 2015; 15:6124-6128. [PMID: 26369211 DOI: 10.1166/jnn.2015.10454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The purpose of this study was to investigate electrochemical deposition of Si-Ca/P on nanotube formed Ti-35Nb-10Zr alloy by cyclic voltammetry method. Electrochemical deposition of Si substituted Ca/P was performed by pulsing the applied potential on nanotube formed surface. The surface characteristics were observed by field-emission scanning electron microscopy, X-ray diffractometer, and potentiodynamic polarization test. The phase structure and surface morphologies of Si-Ca/P deposition were affected by deposition cycles. From the anodic polarization test, nanotube formed surface at 20 V showed the high corrosion resistance with lower value of Icorr, I300, and Ipass.
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Kim DG, Jeong YH, Kosel E, Agnew AM, McComb DW, Bodnyk K, Hart RT, Kim MK, Han SY, Johnston WM. Regional variation of bone tissue properties at the human mandibular condyle. Bone 2015; 77:98-106. [PMID: 25913634 PMCID: PMC4447536 DOI: 10.1016/j.bone.2015.04.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 04/03/2015] [Accepted: 04/15/2015] [Indexed: 10/23/2022]
Abstract
The temporomandibular joint (TMJ) bears different types of static and dynamic loading during occlusion and mastication. As such, characteristics of mandibular condylar bone tissue play an important role in determining the mechanical stability of the TMJ under the macro-level loading. Thus, the objective of this study was to examine regional variation of the elastic, plastic, and viscoelastic mechanical properties of human mandibular condylar bone tissue using nanoindentation. Cortical and trabecular bone were dissected from mandibular condyles of human cadavers (9 males, 54-96 years). These specimens were scanned using microcomputed tomography to obtain bone tissue mineral distribution. Then, nanoindentation was conducted on the surface of the same specimens in hydration. Plastic hardness (H) at a peak load, viscoelastic creep (Creep/Pmax), viscosity (η), and tangent delta (tan δ) during a 30 second hold period, and elastic modulus (E) during unloading were obtained by a cycle of indentation at the same site of bone tissue. The tissue mineral and nanoindentation parameters were analyzed for the periosteal and endosteal cortex, and trabecular bone regions of the mandibular condyle. The more mineralized periosteal cortex had higher mean values of elastic modulus, plastic hardness, and viscosity but lower viscoelastic creep and tan δ than the less mineralized trabecular bone of the mandibular condyle. These characteristics of bone tissue suggest that the periosteal cortex tissue may have more effective properties to resist elastic, plastic, and viscoelastic deformation under static loading, and the trabecular bone tissue to absorb and dissipate time-dependent viscoelastic loading energy at the TMJ during static occlusion and dynamic mastication.
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Affiliation(s)
- Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA.
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Erin Kosel
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Amanda M Agnew
- Division of Anatomy, College of Medicine, The Ohio State University, Columbus, OH 43210, USA
| | - David W McComb
- Department of Materials Science and Engineering, College of Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Kyle Bodnyk
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Richard T Hart
- Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Min Kyung Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - Sang Yeun Han
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
| | - William M Johnston
- Division of General Practice and Materials Science, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA
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Kim DG, Kwon HJ, Jeong YH, Chien HH, Crance S, Agnew AM, Battula S, Lee JW, Wen HB. Associations of Resonance Frequency Analysis with Dynamic Mechanical Analysis of Dental Implant Systems. Clin Implant Dent Relat Res 2015; 18:332-41. [PMID: 25810026 DOI: 10.1111/cid.12319] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Resonance frequency analysis (RFA) has been introduced as a noninvasive method to clinically estimate the stability of dental implant systems. PURPOSE The objective of this study was to examine whether implant stability quotient (ISQ) values of RFA can account for mechanical stability of the dental implant system, which is assessed using dynamic mechanical analysis (DMA). MATERIALS AND METHODS Fifty-seven screw-type titanium dental implants were placed in artificial polyurethane foams with seven different thicknesses (3.5 to 12 mm) and eight edentulous mandibles of human cadavers (four men and four women, 79.11 ± 13.48 years). After the ISQ values, insertion torque, and static stiffness of each implant system were measured, the DMA was performed to assess dynamic stiffness and viscoelastic tan δ. RESULTS The ISQ value had strong positive correlations with thickness, insertion torque, static and dynamic stiffness, and a negative correlation with tan δ of implant systems in artificial bone blocks (r = 0.769 to 0.992, p < .043). However, the ISQ value was correlated with only the insertion torque of implant systems in human mandibles (p < .049). CONCLUSION The ISQ values could reflect mechanical stability of the dental implant system under the controlled condition of homogeneous density in simple dimensions.
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Affiliation(s)
- Do-Gyoon Kim
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Hyun-Jung Kwon
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Yong-Hoon Jeong
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Hua-Hong Chien
- Division of Periodontology, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Samantha Crance
- Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Amanda M Agnew
- Division of Anatomy, College of Medicine, The Ohio State University, Columbus, OH, USA
| | | | - Jin Whan Lee
- Dental Research, Zimmer Dental Inc., Carlsbad, CA, USA
| | - Hai Bo Wen
- Dental Research and Clinical Affairs, Zimmer Dental Inc., Carlsbad, CA, USA
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Jeong YH, Choe HC. Electrochemical Characteristics of Cell Cultured Ti-Nb-Zr Alloys After Nano-Crystallized Si-HA Coating. J Nanosci Nanotechnol 2015; 15:185-188. [PMID: 26328326 DOI: 10.1166/jnn.2015.8385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The aim of this study was to investigate the electrochemical characteristics of nano crystallized Si-HA coating on Ti-Nb-Zr alloy after human osteoblast like (HOB) cell attachment. The Ti-Nb-Zr alloy was manufactured with 35 wt.% of Nb and 10 wt.% of Zr by arc melting furnace to appropriate physical properties as biomaterials. The HA and Si-substituted coatings were prepared by electron-beam physical vapor deposition method with 0.5, 0.8 and 1.2 wt.% of Si contents, and nano aging treatment was performed 500 degrees C for 1 h. The characteristics of coating surface were analyzed by field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction, respectively. To evaluate of cell attachment on cell cultured surface, the potentiodynamic test was performed on the surface using HOB cells. The results showed that the Si-HA coating surface showed higher tendency of cell attachment than that of single HA coating, corrosion resistance value was increased by dense of cell attachment.
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Kim EJ, Jeong YH, Kang BA, Choe HC. Nanotubular Structure on the Ti-29Nb-5Zr Alloy by Scanning Transmission Electron Microscope. J Nanosci Nanotechnol 2015; 15:595-599. [PMID: 26328410 DOI: 10.1166/jnn.2015.8389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this study, we reported the observation of highly ordered nanotubular structure on the Ti-29Nb-5Zr alloy in various potentials and electrolytes by field emission scanning electron microscopy and scanning transmission electron microscope. From the X-ray diffraction results and microstructure analysis, Ti-29Nb-5Zr alloy had β phase. The nanotube morphologies of Ti-29Nb-5Zr alloy were transformed from nano-porous structure to nanotube structure as NaF concentration and voltage increased. Nanotube diameter and layer changed with different concentration of NaF in 1 M H3PO4 at the same voltage. From the X-ray photoelectron spectroscopy results, nanotube was formed by Nb, Zr, and Ti oxide. Also, barrier layer of large tube was about 50 nm thickness, small one was 60 nm thickness. The nanotube size and crystallinity on the β Ti alloy was controlled by fluoride concentration, applied potential, anodization time, and tube layer.
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Kim HJ, Jeong YH, Choe HC. Nanotube Nucleation Phenomena of Titanium Dioxide on the Ti-6Al-4V Alloy Using Anodic Titanium Oxide Technique. J Nanosci Nanotechnol 2015; 15:467-470. [PMID: 26328383 DOI: 10.1166/jnn.2015.8387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The purpose of this study was to investigate nanotube nucleation phenomena of titanium dioxide on the Ti-6Al-4V alloy were investigated using anodic titanium oxide technique. Heat treatment was performed at 1000 degrees C for 12 hour for formation of α+/β phase and water quenched. Ti-6Al-4V alloy was anodized in 1 M H3PO4 electrolytes containing 0.8 wt.% NaF at room temperature. After formation of nanotube was achieved, nanotube layer was eliminated, and then anodization was carried out repeatedly. The microstructures, phase transformation, and morphology of nanotubular Ti-6Al-4V alloy was examined by optical microscopy, X-ray diffraction (XRD), field emission scanning electron microscopy and atomic force microscopy. Microstructures of Ti-6Al-4V alloy showed the β structure with a phase. From XRD pattern of Ti-6Al-4V alloy after heat treatment, β peak was increased, whereas, a peak was decreased. The surface morphology appeared regular nanotube on a phase, whereas, nanotube morphology was not shown on the β phase. α and β phases were affected to form the nanotube of Ti-6Al-4V alloy.
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Kim ES, Jeong YH, Choe HC. The Control of Nanotube Morphology Using Various Factors for Dental Implant. J Nanosci Nanotechnol 2015; 15:181-184. [PMID: 26328325 DOI: 10.1166/jnn.2015.8386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The purpose of this study was to investigate the control of nanotube morphology using various factors for dental implant. TiO2 nanotube formation on biomedical grade α+β type Ti-6Al-4V alloy was investigated using anodization technique as a function of applied DC potential (10 V to 30 V and 30 V to 10 V) and anodization time for 60 min in 1 M H3PO4 with small additions of NaF (0.5 wt.%, and 0.8 wt.%). The microstructure and phase characteristics of surface were examined by optical microscopy, field emission scanning electron microscopy and X-ray diffraction. Also, in order to observe the biocompatibility and surface roughness, wettability and atomic force microscopy of alloy was measured.
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Jeong YH, Choe HC. AC impedance behaviors of electrochemically deposited Si-hydroxyapatite films on nanotube-formed Ti-Nb-Zr alloys. J Nanosci Nanotechnol 2014; 14:9014-9019. [PMID: 25971001 DOI: 10.1166/jnn.2014.10061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The aim of this study was to investigate the AC impedance behaviors of electrochemically deposited Si-hydroxyapatite (HA) films on nanotube-formed Ti-Nb-Zr alloys by the cyclic voltammetry method. Surface modifications were carried out sequentially during nanotube formation and the application of Si-HA coatings. The nanotube surface formed at 10 V had a smaller diameter than that of the nanotube surface formed at 20 V, and the nanotube surface formed at 20 V had a denser pore structure as compared to the nanotube surface formed at 10 V. The Si-HA coating of nanotube surfaces formed at 10 V exhibited flower- and plate-like layers, and the nanotube surface formed at 20 V had larger flower- and plate-like shapes. After 30 deposition cycles, the Si-HA coating showed more rod-like shapes than after 10 deposition cycles. Higher intensity HA peaks were detected after 30 deposition cycles than after 10 deposition cycles. The Ca/P ratio increased with increasing numbers of deposition cycle, and the highest Si percent appeared after 30 deposition cycles. The polarization resistance values commonly decreased more on the nanotube surface formed at 20 V than on the nanotube surface formed at 10 V, and the values also decreased after Si-HA deposition.
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Kim SH, Jeong YH, Choe HC. Surface characteristics of HA coating and micro-pore formation on the Ti-25Nb-xHf alloys for dental materials. J Nanosci Nanotechnol 2014; 14:7745-7750. [PMID: 25942859 DOI: 10.1166/jnn.2014.9407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Micro-pore formation on titanium surface can increase the adhesion strength with increment of surface area, and hydroxyapatite is effective coating materials as a main chemical constituent of bone tissue for biomedical field. The aim of this study was to investigate the surface characteristics of HA coating and micro-pore formation on the Ti-25Nb-xHf alloys for dental materials. The Ti-25Nb-xHf alloys consisted of (0 and 7) wt.% Hf contents which were manufactured by vacuum arc-melting furnace. The homogenization was performed at 1000 degrees C for 12 h and water quenched. Anodization was carried out using an electrochemical method in 1 M H3PO4 electrolyte. The HA films were deposited by plasma sputtering method. The microstructures of alloys were transformed from α" phase to β phase by addition of Hf element, and needle-like structures were translated to an equiaxed structure as Hf content increased. The peaks of anatase and rutile showed on the anodized surface of these alloys. The number of micro-pore decreased, with presence of Hf content increased, whereas size of micro-pore increased. Anodized surface was covered with HA particles at surface and in holes. Contact angle value of HA coating on anodized surface was lower than that of non-coating surface.
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Jo CI, Jeong YH, Brantley WA, Choe HC. Hydroxyapatite precipitation on nanotube surfaces of Ti-35Ta-xNb alloys. J Nanosci Nanotechnol 2014; 14:7581-7584. [PMID: 25942829 DOI: 10.1166/jnn.2014.9576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Hydroxyapatite precipitation on nanotube surfaces of Ti-35Ta-xNb alloys was investigated using electrochemical methods. The alloys were prepared by arc-melting, heat treated at 1050 degrees C for 12 h in an Ar atmosphere, and quenched in 0 degrees C water. Nanotubes were created on the Ti-35Ta-xNb alloys in a 1 M H3PO4 + 1.2 wt.% NaF electrolyte at room temperature. Hydroxyapatite precipitation was carried out in a 0.03 M Ca(NO3)2 x 4H2O + 0.018 M NH4H2PO4 solution at 80 ± 1 degrees C, using 10 deposition cycles. Information about morphology and composition was obtained by FE-SEM and EDS. The microstructure of the Ti-35Ta-xNb alloys was transformed from α phase to βphase as the Nb content increased. The HA precipitates had a plate-like morphology on bulk Ti-35Ta-xNb alloys and a flower-like morphology on nanotubular Ti-35Ta-xNb alloys.
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Kim HJ, Jeong YH, Brantley WA, Choe HC. Nanotube nucleation phenomena on Ti-25Ta-xZr alloys for implants using ATO technique. J Nanosci Nanotechnol 2014; 14:7569-7573. [PMID: 25942827 DOI: 10.1166/jnn.2014.9577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The purpose of this study was to investigate nanotube nucleation phenomena on the Ti-25Ta-xZr alloys for implant materials, using an anodic titanium oxide (ATO) technique. Ti-25Ta-(0 wt.%-15 wt.%) Zr alloys were prepared using a vacuum arc-melting furnace. The Ti-25Ta-xZr alloys were then homogenized for 12 hr at 1000 degrees C, followed by water quenching. Formation of the nanotubular oxide surface structure was achieved initially on the Ti-25Ta-xZr alloys by anodization in a 1 M H3PO4 electrolyte containing 0.8 wt.% NaF at room temperature, using a potentiostat. After the first formation of the nanotubes was achieved, this initial nanotube layer was eliminated, and further anodization was carried out repeatedly. The microstructure, phase transformation, and morphology of nanotubular Ti-25Ta-xZr alloys and the process of nanotube growth using this ATO method were analyzed by X-ray diffraction, field-emission scanning electron microscopy, and energy dispersive X-ray spectroscopy. Microstructures of the Ti-25Ta-xZr alloys changed from α" phase to β phase. Nanotubes formed with the ATO technique had pit-like top holes, with thinner walls and lower contact angle, compared to the initially formed nanotubes.
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Jeong YH, Ban JS, Choe HC. Surface observation of nanotube/micropit formed Ti-Nb-xZr alloy for biocompatibility. J Nanosci Nanotechnol 2013; 13:1706-1709. [PMID: 23755577 DOI: 10.1166/jnn.2013.6964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To improve bone tissue integration on implant surfaces, nanotube formation and laser texturing techniques have been used to increase the roughness of the implant surfaces. In this study, surface film of nanotube/micropit formed Ti-3ONb-xZr and Ti-30Ta-xZr alloy with low elastic modulus have been investigated using field emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscope (EDS). The alloying elements can play role in controlling the nanotube shape and micropit shape, the highly ordered nanostructure, and contact angle for biocompatibility.
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Affiliation(s)
- Yong-Hoon Jeong
- Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials, School of Dentistry Chosun University, Gwangju 501-759, Korea
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Kim JU, Jeong YH, Choe HC. Surface morphology of highly ordered nanotube formed and laser textured beta titanium alloys. J Nanosci Nanotechnol 2013; 13:1876-1879. [PMID: 23755610 DOI: 10.1166/jnn.2013.6962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The aim of the present study is to produce and characterize a well-controlled surface texture on Ti-35Nb-xHf alloys to promote osseointegration. Ti-35Nb-xHf (x = 0, 3, 7 and 15 wt.%) alloys were prepared by arc melting and heat treated for 12 hr at 1000 degrees C in an argon atmosphere and then water quenching. For surface texturing, an amplified Ti: sapphire laser system was used for generating 184 femtosecond (FS, 10(-15) sec) laser pulses with the pulse energy over 30 mJ at a 1 kHz repetition rate with a central wavelength of 800 nm. The nanotube formation was achieved by anodizing a Ti-35Nb-xHf alloy in H3PO4 electrolytes containing 0.8 wt.% NaF at room temperature. The surface morphology of nano/micro structure will enhance osseointegration and cell adhesion.
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Affiliation(s)
- Jae-Un Kim
- Research Center of Nano-Interface Activation for Biomaterials, Department of Dental Materials, School of Dentistry, Chosun University, Gwangju 501-759, Korea
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Kim EJ, Jeong YH, Choe HC. Surface phenomena of hydroxyapatite film on the nanopore formed Ti-29Nb-xZr alloy by anodization for bioimplants. J Nanosci Nanotechnol 2013; 13:1679-1683. [PMID: 23755573 DOI: 10.1166/jnn.2013.6963] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this study, surface phenomena of hydroxyapatite (HA) film on the nanopore formed Ti-29Nb-xZr alloy by anodization for bioimplants have been investigated by electron beam physical vapor deposition (EB-PVD), field emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), potentiostat and contact angle. The microstructure of Ti-29Nb-xZr alloys exhibited equiaxed structure and alpha" phase decreased, whereas beta phase increased as Zr content increased. The increment of Zr contents in HA coated nanotubular Ti-29Nb-xZr alloys showed good corrosion potential in 0.9% NaCI solution. The wettability of HA coated nanotubular surface was higher than that of non-coated samples.
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Affiliation(s)
- Eun-Ju Kim
- Research Center of Nano-Interface Activation for Biomaterials and Research Center for Oral Disease Regulation, School of Dentistry, Department of Dental Materials, Chosun University, Gwangju 501-759, Korea
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Kim JU, Jeong YH, Choe HC. Measurement of oxide thin film dissolution rate on the HA-coated Ti alloy by scanning electron microscopy and impedance spectroscopy. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.4977] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jae-Un Kim
- Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials, and Research Center for Oral Disease Regulation of the Aged, School of Dentistry; Chosun University; Gwangju; Korea
| | | | - Han-Cheol Choe
- Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials, and Research Center for Oral Disease Regulation of the Aged, School of Dentistry; Chosun University; Gwangju; Korea
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Choe HC, Kim JU, Jeong YH. Nanotube growth analysis in the interface between oxide film and titanium alloy substrate using STEM and FE-SEM. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.4980] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Han-Cheol Choe
- Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials, and Research Center for Oral Disease Regulation of the Aged, School of Dentistry; Chosun University; Gwangju Korea
| | - Jae-Un Kim
- Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials, and Research Center for Oral Disease Regulation of the Aged, School of Dentistry; Chosun University; Gwangju Korea
| | - Yong-Hoon Jeong
- Division of Restorative and Prosthetic Dentistry, College of Dentistry; The Ohio State University; 305 W. 12th Ave Columbus OH USA
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Lee JW, Jeong YH, Chang YI, Chang SH. LINEAR PROGRAMMING OPTIMIZATION OF NUCLEAR ENERGY STRATEGY WITH SODIUM-COOLED FAST REACTORS. Nuclear Engineering and Technology 2011. [DOI: 10.5516/net.2011.43.4.383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kim EJ, Kim WG, Jeong YH, Choe HC. Nanotubular oxide surface and layer formed on the Ti-35Ta-xZr alloys for biomaterials. J Nanosci Nanotechnol 2011; 11:7433-7437. [PMID: 22103213 DOI: 10.1166/jnn.2011.4856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Titanium and its alloys are widely used as a dental implant material in clinical dentistry and as an orthopedic implant materials due to their good mechanical properties, corrosion resistance, and biocompatibility. In this study, nanotubular oxide surface and layer formed on the Ti-35Ta-xZr alloys for biomaterials have been investigated by using electrochemical methods. Ti-35Ta-xZr alloys were prepared by arc melting and heat treated for 24 hr at 1000 degrees C in argon atmosphere, and then water quenching. Ti oxide nanotubes were formed on the Ti-35Ta-xZr alloys by anodizing in H3PO4 containing 0.8 wt% NaF solution at 25 degrees C. Anodization was carried out using a scanning potentiostat. Microstructures of the alloys and nanotube surface were examined by FE-SEM, EDX, and XRD. Crystallization treatment of nanotube surface was carried out for 3 hr at 450 degrees C. Microstructures of the Ti-35Ta-xZr alloys were changed from beta phase to alpha'' phase, and changed from an equiaxed to a needle-like structure with increasing Zr content. Nanotubular oxide surface and layers consisting of highly ordered nanotubes with a wide range of diameters (approximately 150-200 nm) and lengths (approximately 4-10 microm) can be formed on alloys in the Ti-35Ta-xZr alloys with Zr content. As the Zr content increased from 3% to 15%, length of step between the bamboo knob-like had increasing values of approximately 50 nm, 80 nm, and 140 nm, respectively. The nanotubes formed on the Ti-35Ta-xZr alloy surface were amorphous structure before heat treatment, but oxide surface had mainly an anatase structure by heat treatment.
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Affiliation(s)
- Eun-Ju Kim
- Department of Dental Materials, Regional Innovation Center for Dental Science & Engineering, Chosun University, Gwangju 501-759, Korea
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Moon BH, Jeong YH, Choe HC. Electrochemical oxide nanotube formation on the Ti-35Ta-xHf alloys for dental materials. J Nanosci Nanotechnol 2011; 11:7428-7432. [PMID: 22103212 DOI: 10.1166/jnn.2011.4855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study, we investigated the electrochemical oxide nanotube formation on the Ti-35Ta-xHf alloys for dental materials. The Ti-35Ta-xHf alloys contained from 3 wt.% to 15 wt.% Hf were manufactured by arc melting furnace. The nanotube oxide layers were formed on Ti-35Ta-xHf alloy by anodic oxidation method in 1 M H3PO4 electrolytes containing 0.5 wt.% NaF and 0.8 wt.% NaF at room temperature. The surface characteristics of Ti-35Ta-xHf alloy and nanotube morphology were determined by FE-SEM, STEM, and XRD. The nano-porous surface of Ti-35Ta-xHf alloys showed in 0.5 wt% NaF solution and nanotubular surface showed in 0.8 wt% NaF solution, respectively. The highly ordered nanotube layer without regular knots was formed on the Ti-35Ta-15Hf alloy in the 0.5 wt% NaF solution compared to on Ti-35Ta-3Hf and Ti-35Ta-7Hf alloys in 0.8 wt% NaF solution. Also, the nanotube length of Ti-35Ta-xHf alloys increased as Hf content increased.
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Affiliation(s)
- Byung-Hak Moon
- Department of Dental Materials, Regional Innovation Center for Dental Science & Engineering, Chosun University, Gwangju 501-759, Korea
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Jeong YH, Kim WG, Choe HC. Electrochemical behavior of nano and femtosecond laser textured titanium alloy for implant surface modification. J Nanosci Nanotechnol 2011; 11:1581-1584. [PMID: 21456241 DOI: 10.1166/jnn.2011.3404] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this study, the electrochemical behavior of nano and femtosecond laser textured titanium alloy for implant surface modification has been researched using the potentiostat equipment. Cp-Ti and Ti-6Al-4V alloy, located on X-Y motorized stage, were irradiated using femtosecond laser. The corrosion properties were examined by a potentiodynamic and AC impedance test.
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Affiliation(s)
- Yong-Hoon Jeong
- Department of Dental Materials and Research Center of Nano-Interface Activation for Biomaterials, School of Dentistry, Chosun University, Gwang-Ju 501-759, Korea
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Jeong YH, Choe HC, Brantley WA. Corrosion characteristics of anodized Ti-(10-40wt%)Hf alloys for metallic biomaterials use. J Mater Sci Mater Med 2011; 22:41-50. [PMID: 21104193 DOI: 10.1007/s10856-010-4188-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Accepted: 11/10/2010] [Indexed: 05/30/2023]
Abstract
The effect of anodizing on corrosion resistance of Ti-xHf alloys has been investigated. Ti-xHf alloys were prepared and anodized at 120, 170 and 220 V in 1 M H(3)PO(4) solution, and crystallized at 300 and 500°C. Corrosion experiments were carried out using a potentiostat in 0.15 M NaCl solution at 36.5 ± 1°C. The Ti-xHf alloys exhibited the α' and anatase phases. The pore size on the anodized surface increases as the applied voltage is increased, whereas the pore size decreases as the Hf content is increased. The anodized Ti-xHf alloys exhibited better corrosion resistance than non-anodized Ti-xHf alloys.
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Affiliation(s)
- Yong-Hoon Jeong
- Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials, Chosun University, Gwangju, Korea
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Abstract
Ti-30Nb-xZr and Ti-30Ta-xNb alloys have been investigated using various methods of surface nanotube formation. Ternary Ti-30Nb-xZr (x = 3 and 15 wt%) and Ti-30Ta-xNb (x = 3 and 15 wt%) alloys were prepared by using high-purity sponge Ti (Grade 4, G&S Titanium, USA), Ta, Zr and Nb spheres. The two groups of ternary Ti alloys were prepared using a vacuum arc melting furnace. Nanotube formation was carried out with a conventional three-electrode configuration with the Ti alloy specimen, a platinum counterelectrode, and a saturated calomel (SCE) reference electrode. Experiments were performed in 1 M H3PO4 with small additions of NaF (0.1-0.8 wt%), using a potentiostat. Nanotubes formed on the surfaces of the two ternary Ti alloys were examined by field emission scanning electron microscopy, EDS and XRD. The Ti-30Ta-xZr alloys had microstructure with entirely needle-like constituents; the thickness of the needle-like alpha-phase increased as the Zr content increased. The Ti-30Nb-xZr alloys had equiaxed microstructures of the beta-phase, and increasing amounts of the needle-like alpha phase appeared at the grain boundaries of the beta-phase as the Zr content increased. The nanotubes were nucleated and grew mainly on the beta phase for the Ti-30Ta-3Zr and Ti-30Nb-3Zr alloys, which had nanotubes with uniform shape, but the nanotubes were nucleated at the alpha phase for the Ti-30Ta-15Zr and Ti-30Nb-15Zr alloys, which had nanotubes with irregular shape and diameters of two sizes. The diameter and depth of the nanotubes could be controlled, depending upon the alloy composition and composition of the surface oxide films (TiO2, Nb2O5, Ta2O5, and ZrO2). It is concluded that this research that selection of the appropriate alloying element can allow significant control of the nanotopography of these Ti alloy surfaces and that it is possible to control the surface nanotube size to promote long-term osseointegration for clinical dental or orthopedic use.
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Affiliation(s)
- Han-Cheol Choe
- Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, School of Dentistry, Chosun University, Gwangju, 501-759, Korea
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Bang IC, Heo GY, Jeong YH, Heo S. AN AXIOMATIC DESIGN APPROACH OF NANOFLUID-ENGINEERED NUCLEAR SAFETY FEATURES FOR GENERATION III+ REACTORS. Nuclear Engineering and Technology 2009. [DOI: 10.5516/net.2009.41.9.1157] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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