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Morphometric analysis of maxillary alveolar regions for immediate implantation
Park, Man-Soo,Park, Young-Bum,Choi, Hyunmin,Moon, Hong-Seok,Chung, Moon-Kyu,Cha, In-Ho,Kim, Hee-Jin,Han, Dong-Hoo The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.4
PURPOSE. The purpose of this study was to provide an actual guideline in determining the shape, diameter, and position of the implant in immediate implantation by the measurement of the thickness of facial and palatal plate, the thickness of cortical bone on the facial and palatal plate, the diameter of the root, and the distance between the roots in the cadavers. MATERIALS AND METHODS. The horizontal sections of 20 maxillae were measured and analyzed to obtain the average values. Resin blocks were produced and cut serially at 1 mm intervals from the cervical line to the root apex. Images of each section were obtained and the following measurements were performed: The thickness of the facial and palatal residual bone at each root surface, the thickness of the facial and palatal cortical bone at the interdental region, the diameter of all roots of each section on the faciopalatal and mesiodistal diameter, and the interroot distance. Three specimens with measurements close to the average values were chosen and 3-dimensional images were reconstructed. RESULTS. The thickness of the facial and palatal cortical bone at the interdental region in the maxilla, the buccal cortical bone was thicker in the posterior region compared to the anterior region. The interroot distance of the alveolar bone thickness between the roots increased from anterior to posterior region and from coronal to apical in the maxilla. CONCLUSION. In this study, the limited results of the morphometric analysis of the alveolar ridge using the sections of maxilla in the cadavers may offer the useful information when planning and selecting optimal implant for immediate implantation in the maxilla.
Park, Woon Bae,Kim, Hyunmin,Park, Hwangseo,Yoon, Chulsoo,Sohn, Kee-Sun American Chemical Society 2016 Inorganic Chemistry Vol.55 No.5
<P>A Ca1.5Ba0.5Si5O3N6:Eu2+ phosphor with a monoclinic lattice in the Cm space group exhibiting a composite structure consisting of CaSi2O2N2-like and BaSi6N8O-like structures was examined in terms of structure and luminescence. The luminescent properties of the Ca1.5Ba0.5Si5O3N6:Eu2+ phosphor could be suitable for light emitting diode applications since it exhibited a promising yellow (or amber) emission peaking at similar to 570-590 nm at excitations of 450-460 nm. The present investigation was focused on verifying the composite structure by employing quantum mechanical calculations such as the Hartree-Fock ab initio calculation and a density functional theory calculation along with precise structural and compositional analyses. The two-peak emission behavior ascribed to the composite structure was also examined in terms of continuous wave time-resolved In addition, the energy and photoluminescence. transfer between two activator sites ascribed to the composite structure was examined in detail.</P>
Effect of alendronate on bone remodeling around implant in the rat
Park, Ran,Kim, Jee-Hwan,Choi, Hyunmin,Park, Young-Bum,Jung, Han-Sung,Moon, Hong-Seok The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.4
PURPOSE. The purpose of this study was to evaluate the effect of alendronates on bone remodeling around titanium implant in the maxilla of rats. MATERIALS AND METHODS. The maxillary first molars were extracted and customized-titanium implants were placed immediately in thirty male Sprague-Dawley rats. The rats were divided into experimental (bisphosphonate) group and control group. At 4 weeks after implantation, the rats in the bisphosphonate group were subcutaneously injected with alendronate three times a week for 6 weeks where as the rats in control group were injected with saline. The rats were sacrificed at 1, 2, 3, 4, or 6 weeks after starting of injection and maxillary bones were collected subsequently. Alveolar bone remodeling around the implants were evaluated by radiographic and histologic analysis. Microarray analysis and immunohistomorphologic analysis were also performed on one rat, sacrificed at 6 weeks after starting of injection, from each group. Statistical analysis was performed using repeated measures analysis of variance and independent t test at a significance level of 5%. RESULTS. There was no statistically significant difference in the bone area (%) around implant between the bisphosphonate group and the control group. However, the amount of empty lacuna was significantly increased in the bisphosphonate group, especially in the rats sacrificed at 4 weeks after starting of injection compared to that of the corresponding control group. The bisphosphonate group showed the same level of TRAP positive cell count, osteocalcin and angiopoietin 1 as the control group. CONCLUSION. Alendronate may not decrease the amount of osteoclast. However, the significantly increased amount of empty lacuna in the bisphosphonate group may explain the suppression of bone remodeling in the bisphosphonate group.
Park, Hyunmin,Lee, Keel Yong,Kim, Wanjung,Shin, Hee-Won,Wang, Dong Hwan,Ahn, Tae Kyu,Park, Jong Hyeok American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.5
<P>Organic photovoltaic devices are difficult to commercialize because of their vulnerability to chemical degradation related with oxygen and water and to physical degradation with aging at high temperatures. We investigated the photophysical degradation behaviors of a series of poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl C61-butyric acid methyl ester (PC<SUB>60</SUB>BM) bulk heterojunctions (BHJs) as a model system according to the donor–acceptor ratio. We found that the optimum P3HT:PC<SUB>60</SUB>BM ratio in terms of long-term stability differs from that in terms of initial cell efficiency. On the basis of cell performance decays and time-resolved photoluminescence measurements, we investigated the effects of oxygen and material self-aggregation on the stability of an organic photovoltaic device. We also observed the changes in morphological geometry and analyzed the surface elements to verify the mechanisms of degradation.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-5/am302185f/production/images/medium/am-2012-02185f_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302185f'>ACS Electronic Supporting Info</A></P>
Hyunmin Park,Miran Lee,Yongjoo Rhee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
The hyperne structures of four levels of the Sm isotopes have been measured by means of diode-laser-based Doppler-free saturated absorption spectroscopy in combination with a diodelaser- initiated resonance-ionization mass spectroscopy. It was demonstrated that combining the two spectroscopic methods was very eective for the identication and accurate measurement of the spectral lines of atoms with several isotopes, such as the rare-earth elements. From the obtained spectra, the hyperne constants A and B for the odd-mass isotopes 147Sm and 149Sm were determined for four upper levels of the studied transitions.
Laser Isotope Separation of 176Yb for Medical Applications
Park Hyunmin,Han Jaemin,Jeong Do-Young,Kim Cheol-Jung,Kim Tak-soo,Kwon Duck-Hee,Nam Sungmo,Rhee Yongjoo,Yongho Cha 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
The radioisotope, 177Lu, is emerging as a promising isotope for a variety of medical applications such as cancer treatment. Enriched 176Yb can be used as a source material for the production of 177Lu in an atomic reactor. For these applications, we have developed a laser separation technology based on isotopic selective photoionization to enrich the stable 176Yb isotope. Our separation system consists of three dye lasers, a Yb vaporizer, and an ion-extraction system. Especially, we use a compact diode-pumped solid-state laser as the pumping source of the dye lasers. With the developed system, we succeeded in producing enriched 176Yb with an abundance of more than 97 %.
Choi, Hyunmin,Park, Nho-Jae,Jamiyandorj, Otgonbold,Hong, Min-Ho,Oh, Seunghan,Park, Young-Bum,Kim, Sungtae Korean Academy of Periodontology 2012 Journal of Periodontal & Implant Science Vol.42 No.5
Purpose: The aim of this study was to evaluate the improvement of osteogenic potential of biphasic calcium phosphate (BCP) bone substitute coated with synthetic cell-binding peptide sequences in a standardized rabbit sinus model. Methods: Standardized 6-mm diameter defects were created bilaterally on the maxillary sinus of ten male New Zealand white rabbits, receiving BCP bone substitute coated with synthetic cell binding peptide sequences on one side (experimental group) and BCP bone substitute without coating (control group) on the other side. Histologic and histomorphometric analysis of bone formation was carried out after a healing period of 4 or 8 weeks. Results: Histological analysis revealed signs of new bone formation in both experimental groups (4- and 8-week healing groups) with a statistically significant increase in bone formation in the 4-week healing group compared to the control group. However, no statistically significant difference in bone formation was found between the 8-week healing group and the control group. Conclusions: This study found that BCP bone substitute coated with synthetic cell-binding peptide sequences enhanced osteoinductive potential in a standardized rabbit sinus model and its effectiveness was greater in the 4-week healing group than in the 8-week healing group.