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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.
Truc Thanh Tran,공형윤 한국통신학회 2013 Journal of communications and networks Vol.15 No.5
With a long sensing period, the inter-frame spectrumsensing in IEEE 802.22 standard is vulnerable to the effect of thetraffic of the primary user (PU). In this article, we address the twodegrading factors that affect the inter-frame sensing performancewith respect to the random arrival/leaving of the PU traffic. Theyare the noise-only samples under the random arrival traffic, andthe PU-signal-contained samples under the random leaving traffic. We propose the model in which the intra-frame sensing cooperateswith the inter-frame one, and the inter-frame sensing uses the timeof-arrival (ToA), and time-of-leave (ToL) detectors to reduce thetwo degrading factors in the inter-frame sensing time. These ToAand ToL detectors are used to search for the sample which containseither the ToA or ToL of the PU traffic, respectively, whichallows the partial cancelation of the unnecessary samples. At thefinal stage, the remaining samples are input into a primary userdetector, which is based on the energy detection scheme, to determinethe status of PU traffic in the inter-frame sensing time. Theanalysis and the simulation results show that the proposed schemeenhances the spectrum-sensing performance compared to the conventionalcounter-part.
7-mm-long dental implants: retrospective clinical outcomes in medically compromised patients
Truc Thi Hoang Nguyen,Mi Young Eo,Yun Ju Cho,Hoon Myoung,Soung Min Kim 대한구강악안면외과학회 2019 대한구강악안면외과학회지 Vol.45 No.5
Objectives: Dental implants shorter than 8 mm, called short dental implants (SDIs), have been considered to have a lower success rate than standard length implants. But recent studies have shown that SDIs have a comparable success rate, and implant diameter was more important for implant survival than implant length. Also, SDIs have many advantages, such as no need for sinus lifting or vertical bone grafting, which may limit use in medically compromised patients. Materials and Methods: In this study, 33 patients with 47 implants 7-mm long were examined over the last four years. All patients had special medical history and were categorized into 3 groups: systemic disorders, such as diabetes mellitus (controlled or uncontrolled), mental disability, and uncontrolled hypertension; oral cancer ablation with reconstruction, with or without radiotherapy; diverse osteomyelitis, such as osteoradionecrosis and bisphosphonate-related osteonecrosis of the jaw. Most of these patients have insufficient residual bone quality due to mandible atrophy or sinus pneumatization. Results: The implant diameters were 4.0 (n=38), 4.5 (n=8), and 5.0 mm (n=1). Among the 47 implants placed, 2 implants failed before the last follow-up. The survival rate of 7-mm SDIs was 95.74% from stage I surgery to the last follow-up. Survival rates did not differ according to implant diameter. The mean marginal bone loss (MBL) at 3 months, 1 and 2 years was significantly higher than at implant installation, and the MBL at 1 year was also significantly higher than at 3 months. MBL at 1 and 2 years did not differ significantly. Conclusion: Within the limitations of the present study, the results indicate that SDIs provide a reliable treatment, especially for medically compromised patients, to avoid sinus lifting or vertical bone grafting. Further, long-term follow-up is needed.
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.
A Method to Avoid Mutual Interference in a Cooperative Spectrum Sharing System
Truc Thanh Tran,공형윤 한국통신학회 2014 Journal of communications and networks Vol.16 No.2
This article proposes a spectrum sharing method whichcan avoid the mutual interference in both primary and secondarysystems. The two systems make them a priority to use two singledimensionorthogonal signals, the real and imaginary pulse amplitudemodulationsignals, if the primary system is not in outage withthis use. A secondary transmitter is selected to be the primary relayand the active secondary source to perform this. This allows a simultaneousspectrumaccess without anymutual interference. Otherwise,the primary system attempts to use a full two-dimensionalsignal, the quadrature amplitude modulation signal. If there is nooutage with respect to this use, the secondary spectrumaccess is notallowed. When both of the previous attempts fail, the secondarysystem is allowed to freely use the spectrum two whole time slots. The analysis and simulation are provided to analyze the outage performanceand they validate the considerable improvement of theproposed method as compared to the conventional one.
Truc Tam Vu,Yuichiro Morishita,Itaru Yugue,Tetsuo Hayashi,Takeshi Maeda,Keiichiro Shiba 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.3
Study Design: Retrospective study. Purpose: To evaluate the radiological outcome of the surgical treatment of thoracolumbar burst fractures by using short segment posterior instrumentation (SSPI) and fusion. Overview of Literature: The optimal surgical treatment of thoracolumbar burst fractures remains a matter of debate. SSPI is one of a number of possible choices, yet some studies have revealed high rates of poor radiological outcome for this SSPI. Methods: Patients treated using the short segment instrumentation and fusion technique at the Spinal Injuries Center (Iizuka, Fukuoka, Japan) from January 1, 2006 to July 31, 2012 were selected for this study. Radiographic parameters such as local sagittal angle, regional sagittal angle, disc angle, anterior or posterior height of the vertebral body at admission, postoperation and final observation were collected for radiological outcome evaluation. Results: There were 31 patients who met the inclusion criteria with a mean follow-up duration of 22.7 months (range, 12–48 months). The mean age of this group was 47.9 years (range, 15–77 years). The mean local sagittal angles at the time of admission, post-operation and final observation were 13.1°, 7.8° and 14.8°, respectively. There were 71% good cases and 29% poor cases based on our criteria for the radiological outcome evaluation. The correction loss has a strong correlation with the load sharing classification score (Spearman rho=0.64, p <0.001). Conclusions: The loss of kyphotic correction following the surgical treatment of thoracolumbar burst fracture by short segment instrumentation is common and has a close correlation with the degree of comminution of the vertebral body. Patients with high load sharing scores are more susceptible to correction loss and postoperative kyphotic deformity than those with low scores.
Truc Cong Ho,Anley Teferra Kiddane,파즐러라만칸,Yeon-Jin Cho,박진석,Hee-Jeong Lee,GUN-DO KIM,Young-Mog Kim,Byung-Soo Chun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
In this study, the pressurized liquid extraction (PLE) of total phenolic content (TPC), gallic acid (GA), andp-hydroxybenzoic acid (PHBA) from Pseuderanthemum palatiferum (Nees) Radlk. leaves was optimizedusing response surface methodology. The extract at the optimum conditions of TPC, namely OP, was characterizedusing GC–MS, HPLC, and spectrophotometry analysis. Furthermore, bio-functional properties ofthe OP, including antioxidant, antimicrobial, antihypertensive activities, and cytotoxicity against cancerand normal cell lines, were also investigated. The results showed that all extraction models were appropriatein predicting the extraction processes (p < 0.05) of the target compounds. In addition to TPC, GA,and PHBA, the OP also contains a high amount of other valuable components that contributed to itshighly biological activities. Moreover, the OP was nontoxic on HaCaT cells with a concentration of nomore than 1000 mg/mL. From the obtained results, PLE proved to be a suitable technique for the recoveryof bioactive compounds from P. palatiferum leaves.
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.