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Truc Thi Hoang Nguyen(Truc Thi Hoang Nguyen ),Mi Young Eo(Mi Young Eo),Kezia Rachellea Mustakim(Kezia Rachellea Mustakim ),Mi Hyun Seo(Mi Hyun Seo),Hoon Myoung(Hoon Myoung ),Soung Min Kim(Soung Min Ki 대한구강악안면외과학회 2023 대한구강악안면외과학회지 Vol.49 No.1
The biocompatibility and durability of implant fixtures are major concerns for dentists and patients. Mechanical complications of the implant include abutment screw loosening, screw fracture, loss of implant prostheses, and implant fracture. This case report aims to describe management of a case of fixture damage that occurred after screw fracture in a tissue level, internal connection implant and microscopic evaluation of the fractured fixture. A trephine bur was used to remove the fixture, and the socket was grafted using allogeneic bone material. The failed implant was examined by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), which revealed a fractured fixture with both normal and irregular bone patterns. The SEM and EDS results give an enlightenment of the failed fixture surface micromorphology with microfracture and contaminated chemical compositions. Noticeably, the significantly high level of gold (Au) on the implant surface and the trace amounts of Au and titanium (Ti) in the bone tissue were recorded, which might have resulted from instability and micro-movement of the implant-abutment connection over an extended period of time. Further study with larger number of patient and different types of implants is needed for further conclusion.
Van-Truc Nguyen,Thanh-Binh Nguyen,Thi-Dieu-Hien Vo,Nguyen Duy Dat,Thi-Kim Quyen Vo,Xuan Cuong Nguyen,Viet-Cuong Dinh,Thi-Ngoc-Chau Le,Thi-Giang-Huong Duong,Manh-Ha Bui,Xuan-Thanh Bui 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
This study explores the adsorption of doxycycline (DOX) from aqueous solutions onto biochar derived from banana peel, which was prepared using a potassium hydroxide activation method (KOH-BPB). The biochar properties were characterized based on morphology, surface area (SBET of 710.241 ㎡ g<SUP>−1</SUP>), functional groups, and surface charge (pHPZC = 7.7). Parameters, including initial pH, DOX concentration, and ionic strength, that influenced the DOX adsorption capacity of KOH-BPB were examined. Adsorption equilibrium of DOX on KOH-BPB was assessed through four isothermal models: the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. The obtained data were most compatible with the Langmuir model (R² = 0.9879). KOH-BPB has a maximum DOX absorption capacity of 121.95 mg g<SUP>-1</SUP> which exceeds that of many comparable absorbents. The maximum DOX removal was 96.7% at pH 6, a DOX concentration of 20 mg L<SUP>-1</SUP>, and a KOH-BPB dose of 1.0g L<SUP>-1</SUP>. These findings reveal that biochar from banana peel effectively removes antibiotic residues from water. This study provides a potential, low-cost, and environmentally friendly adsorbent.
The Root Causes of Rural Tourism Development Intentions in Vietnam:A Local Government Perspective
Hoai Than Nguyen,Tan Thanh Nguyen,Thi Thanh Truc Nguyen,Tan Hai Nguyen 영남대학교 박정희새마을연구원 2023 새마을학연구 Vol.8 No.1
Rural tourism has gained popularity in Vietnam, attracting more tourists, particularly foreigners and urban visitors. Despite the attention it receives from the central government, rural tourism development faces challenges, including the perceptions of local civil servants. This study combines the theories of planned behavior and organizational support theory to propose a model predicting the intention of local civil servants to develop rural tourism. A quantitative approach was used, with a questionnaire survey distributed to 405 local civil servants participating in training programs. The findings indicate that factors from both theories positively and significantly influence the intention of rural tourism development. Notably, perceived leader support directly impacts intention and moderates the relationship between perceived government support and intention. Despite its limited practical performance, the study emphasizes the importance of attitude toward rural tourism development. The research provides implications for academics, government, and policymakers to enhance local civil servants' intention for future rural tourism development.
Truc Thi Hoang Nguyen,Mi Young Eo,Mi Hyun Seo,Soung Min Kim 대한악안면성형재건외과학회 2022 Maxillofacial Plastic Reconstructive Surgery Vol.44 No.-
Background: Even though dental implants are a reliable choice for dental rehabilitation, implant failures due to various etiologies have been reported. Early implant failures account for 2 to 6% of installed implants and are reported to have a higher rate than late failures, regardless of loading time. We herein report three cases of acute sinusitis and early implant failure with implants that failed within 1 month after installation. The aim of this study was to evaluate the surface properties of early failed implants and peri-implant tissue to determine the early osseointegration pattern in acute sinusitis-related failed implants as well as the possible role of surface contamination in the failure of osseointegration. Results: A combined histological, electron microscopy, and X-ray spectroscopy approach was used to characterize the surface of non-osseointegrated titanium implants and the surrounding biological tissues. Morphologic scanning electron microscopy revealed a heterogeneous surface and irregular osseointegration. The implant surface was covered mostly by carbon- and oxygen-rich organic matter. Energy-dispersive X-ray spectroscopy surface analysis of three implants showed the incorporation of some contaminants in both the upper and apical regions. Carbon, nitrogen, sodium, silicon, chlorine, sulfur, gold, and zirconium were detected on the surface of one or more failed implants. Fibrosis, lymphocytic, and macrophage infiltrates and a high activation of osteoclasts surrounding the bone graft particles were detected in the surrounding tissues. Conclusions: The etiology and mechanism of early implant failure, especially in sinus-related cases, as well as the proper management interventions to minimize the rate of early implant failures, are of great concern. No matter how confident and accurate the surgeon’s operation, there may be unknown errors in the whole procedure that no one knows about. Rather than errors related to the implant surface, it is expected that there were invisible problems during the evaluation of the patient’s own unique sinus mucosal inflammation or the operator’s own procedure. Furthermore, well-designed researches are necessary to reveal the effect of material-related factors on acute sinus complication and early implant failure.
Large myxomatous odontogenic tumor in the jaw: a case series
Truc Thi Hoang Nguyen,Mi Young Eo,Yun Ju Cho,Hoon Myoung,Soung Min Kim 대한구강악안면외과학회 2021 대한구강악안면외과학회지 Vol.47 No.2
Objectives: Myxomatous odontogenic tumors (MOTs) are the third most common odontogenic tumors in the oral and maxillofacial region. Due to its slow-growing, but locally invasive nature, the tumor is usually detected by accident or only when it becomes a large mass, which causes facial deformity. Materials and Methods: Current study reports three unusual cases of MOT including huge myxoma involve the mandible in middle-aged man, MOT with ossifying fibroma pattern in mandible, and MOT in maxilla of young female patient. The diagnosis and treatment strategy of MOTs was also summarized and updated. Results: In reported three cases of patients with large MOTs, surgical treatment was indicated with fibular free flap reconstruction in the mandible and plate reconstruction in the maxilla. The tumors were successfully treated with radical resection and did not show signs of recurrence during the followup period. Conclusion: Surgical treatment indication depends on size, the position of the lesion, patient systemic condition and surgeon individual experience. In the case of a large tumor, radical resection and reconstruction is the standard surgical strategy. The conservative surgical treatment including enucleation with wide curettage is still under controversy. The recurrence rate for MOTs is significantly high, up to 30%, therefore long-term follow-up is essential.
Solitary plasmacytoma in the maxillary sinus: 10-year follow-up
Truc Thi Hoang Nguyen,Mi Young Eo,Buyanbileg Sodnom-Ish,Yun Ju Cho,Soung Min Kim 대한구강악안면외과학회 2021 대한구강악안면외과학회지 Vol.47 No.6
Solitary plasmacytoma (SP) is an uncommon form of plasma cell neoplasm occurring intraosseously or in soft tissue and presents as a single mass of monoclonal plasma cells. SP in the maxillary sinus is rare and can be misdiagnosed as other maxillary sinus tumors. The essential examinations in patients with the initial diagnosis of plasmacytoma are bone marrow biopsy, serum and urine electrophoresis, and kappa/lambda ratio (κ:λ ratio) to rule out multiple myeloma (MM). Herein, a rare case of SP in the maxillary sinus treated by surgery and localized radiation is reported. At the 10-year follow-up examination, local recurrence or disseminated development of MM were not evident.
Novel store–carry–forward scheme for message dissemination in vehicular ad-hoc networks
Truc D.T. Nguyen,Thanh-Van Le,Hoang-Anh Pham 한국통신학회 2017 ICT Express Vol.3 No.4
To improve traffic safety in intelligent transportation systems, vehicles formed by vehicular ad-hoc networks (VANETs) conventionally disseminate warning messages to their nearby vehicles as soon as a dangerous situation occurs. In this paper, we propose a novel scheme employing a novel story–carry–forward (SCF) mechanism to tackle the network partition and broadcast storm problems, which are two major challenges in VANETs. The experimental result in the Veins simulation framework shows that the proposed SCF scheme significantly mitigates broadcast storms relative to other schemes, and maintains good coverage across various traffic densities.
Truc Ly Nguyen,이의주,정혁,김병권 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.7
In this study, electrochemical experiments were carried out in chloroform using ferrocene (Fc) or anthracene (An). We performed cyclic voltammetry (CV) on Fc and An in chloroform containing either tetrabutylammonium perchlorate (TBAP) or tetrabutylammonium hexafluoro-phosphate (TBAPF6) over the temperature range of 25 to 50°C. The resulting pattern of CVs, half-wave potential ( E 1 /2), diffusion coefficient of Fc and An, steady-state current, solution viscosity, and long-term stabilities were studied.