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Yu, Mi-Kyung,Lim, Myung-Jin,Na, Noo-Ri,Lee, Kwang-Won The Korean Academy of Conservative Dentistry 2020 Restorative Dentistry & Endodontics Vol.45 No.1
Objectives: This study investigated the effects of a hydrofluoric acid (HA; solution of hydrogen fluoride [HF] in water)-based smart etching (SE) solution at an elevated temperature on yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics in terms of bond strength and morphological changes. Materials and Methods: Eighty sintered Y-TZP specimens were prepared for shear bond strength (SBS) testing. The bonding surface of the Y-TZP specimens was treated with 37% phosphoric acid etching at 20℃-25℃, 4% HA etching at 20℃-25℃, or HA-based SE at 70℃-80℃. In all groups, zirconia primers were applied to the bonding surface of Y-TZP. For each group, 2 types of resin cement (with or without methacryloyloxydecyl dihydrogen phosphate [MDP]) were used. SBS testing was performed. Topographic changes of the etched Y-TZP surface were analyzed using scanning electron microscopy and atomic force microscopy. The results were analyzed and compared using 2-way analysis of variance. Results: Regardless of the type of resin cement, the highest bond strength was measured in the SE group, with significant differences compared to the other groups (p < 0.05). In all groups, MDP-containing resin cement yielded significantly higher bond strength values than MDP-free resin cement (p < 0.05). It was also shown that the Y-TZP surface was etched by the SE solution, causing a large change in the surface topography. Conclusions: Bond strength significantly improved when a heated HA-based SE solution was applied to the Y-TZP surface, and the etched Y-TZP surface was more irregular and had higher surface roughness.
A novel prognostic factor for hepatocellular carcinoma: protein disulfide isomerase
Yu, Su Jong,Won, Jae-Kyung,Ryu, Han Suk,Choi, Won-Mook,Cho, Hyeki,Cho, Eun-Ju,Lee, Jeong-Hoon,Kim, Yoon Jun,Suh, Kyung-Suk,Jang, Ja-June,Kim, Chung Yong,Lee, Hyo-Suk,Yoon, Jung-Hwan,Cho, Kwang-Hyun The Korean Association of Internal Medicine 2014 The Korean Journal of Internal Medicine Vol.29 No.5
<P><B>Background/Aims</B></P><P>Protein disulfide isomerase (PDI) has been implicated in the survival and progression of some cancer cells, by compensating for endoplasmic reticulum stress by upregulating the protein-folding capacity. However, its prognostic role in patients with hepatocellular carcinoma (HCC) has not been investigated.</P><P><B>Methods</B></P><P>We collected HCC tissues from 83 HCC patients who underwent surgical resection for an immunohistochemical study of PDI. Overall survival (OS) was measured from the date of surgical resection until the date of death from any cause. Radiological progression was evaluated using the modified Response Evaluation Criteria in Solid Tumors in an independent radiological assessment.</P><P><B>Results</B></P><P>PDI expression was found to be increased in human HCC compared to adjacent nontumor tissues. Increased immunopositivity for PDI was associated with a high Edmondson-Steiner grade (<I>p</I> = 0.028). Univariate analysis of patients who had undergone surgical resection for HCC showed that tumor PDI upregulation is a significant risk factor for poor OS (<I>p</I> = 0.016; hazard ratio [HR], 1.980) and time to progression (TTP; <I>p</I> = 0.007; HR, 1.971). Multivariate analyses revealed that high PDI expression was an independent predictor of a shorter TTP (<I>p</I> = 0.015; HR, 1.865) and poor OS (<I>p</I> = 0.012; HR, 2.069).</P><P><B>Conclusions</B></P><P>Upregulated PDI expression is associated with aggressive clinicopathological features of HCC; thus, PDI might serve as an independent prognostic factor and a potential therapeutic target for HCC patients.</P>
An Unusual Clinical Presentation of Kimura`s Disease Occurring on the Buttock of a Five-year-old Boy
Won Jun Choi,Jae Hur,Joo Yeon Ko,Kwang Yeoll Yeo,Joung Soo Kim,Hee Joon Yu 대한피부과학회 2010 Annals of Dermatology Vol.22 No.1
Kimura`s disease is a rare inflammatory disorder of unknown etiology primarily seen in young Asian males. It is characterized by painless subcutaneous masses, blood and tissue eosinophilia, and markedly elevated serum immunoglobulin E (IgE) levels. Clinically, the subcutaneous nodules occur predominantly in the head and neck. However, we report the case of a five-year-old boy presenting with an asymptomatic solitary brown pigmented nodule on the left buttock diagnosed with Kimura`s disease. Here we describe the diagnosis and treatment of this unusual case. (Ann Dermatol 22(1) 57∼60, 2010)
Notes : Proteomes Induced by S-Adenosyl-L-Methionine in Streptomyces coelicolor A3(2)
( Kwang Pyo Kim ),( Choon Shik Shin ),( Soo Jae Lee ),( Ji Hye Kim ),( Jung Mo Young ),( Yu Kyung Lee ),( Joong Hoon Ahn ),( Joo Won Suh ),( Yoong Ho Lim ) 한국미생물 · 생명공학회 2006 Journal of microbiology and biotechnology Vol.16 No.5
HBV : PE-023 ; Lower quantitative HBsAg level in patients with HCC than in patients without HCC
( Yu Jin Kim ),( Yong Han Paik ),( Yang Won Min ),( Geum Youn Gwak ),( Moon Seok Choi ),( Joon Hyeok Lee ),( Kwang Cheol Koh ),( Seung Woon Paik ),( Byung Chul Yoo ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-
Background: Recently, quantitative hepatitis B surface antigen (qHBsAg) levels in chronic hepatitis B (CHB) have been described. However, data on qHBsAg levels according to the presence of hepatocellular carcinoma (HCC) is insufficient. We aimed to describe and compare qHBsAg levels in CHB patients with or without HCC. Methods: We retrospectively enrolled 739 treatment naive CHB patients from January 2009 to December 2010. We reviewed their medical record collected data including qHBsAg level, hepatitis B virus (HBV) DNA, and disease status when HBsAg level was quantified. Presence of HCC was defined as described in KASL guideline. qHBsAg levels were compared using student`s t- test or ANOVA between HCC and non-HCC patients. Results: Two hundred eighteen patients (29.5%) had HCC. Mean value of qHBsAg (log IU/mL) level was 2.53 ± 1.17 in patients with HCC and 3.03 ± 1.32 in non-HCC patients (p<0.000) and HBV DNA (log IU/m) level was 4.13 ±2.25 and 4.3 ± 2.71 (p=0.419), respectively. qHBsAg level was compared in patients with HCC vs without HCC according to each phase of CHB: 3.20 ± 0.58 (n=36) vs 4.10 ± 0.68 (n=146) in HBeAg positive hepatitis (p<0.000), 2.26 ± 1.13(n=60) vs 2.66 ± 1.27 (n=277) in HBeAg negative hepatitis (p=0.027), 3.30 ± 0.35 (n=12) vs 3.49 ± 0.77 (n=28) in HBeAg positive hepatitis with liver cirrhosis (LC) (p=0.059), and 2.37 ± 1.27 (n=110) vs 2.09 ± 1.29 (n=70) in HBeAg negative hepatitis with LC. In 218 patients with HCC, qHBsAg level was 2.46 ± 1.24 in patients with LC (n=122) and 2.61 ± 1.06 without LC (p=0.346). Conclusions: In this study, qHBsAg level was not higher in patients with HCC than in patients without HCC. This tendency was observed regardless of the phase of CHB.
Change of phase transformation and bond strength of Y-TZP with various hydrofluoric acid etching
Yu Mi-Kyung,Oh Eun-Jin,Lim Myung-Jin,Lee Kwang-Won 대한치과보존학회 2021 Restorative Dentistry & Endodontics Vol.46 No.4
Objectives The purpose of this study was to quantify phase transformation after hydrofluoric acid (HF) etching at various concentrations on the surface of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP), and to evaluate changes in bonding strength before and after thermal cycling. Materials and Methods A group whose Y-TZP surface was treated with tribochemical silica abrasion (TS) was used as the control. Y-TZP specimens from each experimental group were etched with 5%, 10%, 20%, and 40% HF solutions at room temperature for 10 minutes. First, to quantify the phase transformation, Y-TZP specimens (n = 5) treated with TS, 5%, 10%, 20% and 40% HF solutions were subjected to X-ray diffraction. Second, to evaluate the change in bond strength before and after thermal cycling, zirconia primer and MDP-containing resin cement were sequentially applied to the Y-TZP specimen. After 5,000 thermal cycles for half of the Y-TZP specimens, shear bond strength was measured for all experimental groups (n = 10). Results The monoclinic phase content in the 40% HF-treated group was higher than that of the 5%, 10%, and 20% HF-treated groups, but lower than that of TS-treated group (p < 0.05). The 40% HF-treated group showed significantly higher bonding strength than the TS, 5%, and 10% HF-treated groups, even after thermal cycling (p < 0.05). Conclusions Through this experiment, the group treated with SiO2 containing air-borne abrasion on the Y-TZP surface showed higher phase transformation and higher reduction in bonding strength after thermal cycling compared to the group treated with high concentration HF. Objectives The purpose of this study was to quantify phase transformation after hydrofluoric acid (HF) etching at various concentrations on the surface of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP), and to evaluate changes in bonding strength before and after thermal cycling. Materials and Methods A group whose Y-TZP surface was treated with tribochemical silica abrasion (TS) was used as the control. Y-TZP specimens from each experimental group were etched with 5%, 10%, 20%, and 40% HF solutions at room temperature for 10 minutes. First, to quantify the phase transformation, Y-TZP specimens (n = 5) treated with TS, 5%, 10%, 20% and 40% HF solutions were subjected to X-ray diffraction. Second, to evaluate the change in bond strength before and after thermal cycling, zirconia primer and MDP-containing resin cement were sequentially applied to the Y-TZP specimen. After 5,000 thermal cycles for half of the Y-TZP specimens, shear bond strength was measured for all experimental groups (n = 10). Results The monoclinic phase content in the 40% HF-treated group was higher than that of the 5%, 10%, and 20% HF-treated groups, but lower than that of TS-treated group (p < 0.05). The 40% HF-treated group showed significantly higher bonding strength than the TS, 5%, and 10% HF-treated groups, even after thermal cycling (p < 0.05). Conclusions Through this experiment, the group treated with SiO2 containing air-borne abrasion on the Y-TZP surface showed higher phase transformation and higher reduction in bonding strength after thermal cycling compared to the group treated with high concentration HF.
HBV : PE-023 ; Lower quantitative HBsAg level in patients with HCC than in patients without HCC
( Yu Jin Kim ),( Yong Han Paik ),( Yang Won Min ),( Geum Youn Gwak ),( Moon Seok Choi ),( Joon Hyeok Lee ),( Kwang Cheol Koh ),( Seung Woon Paik ),( Byung Chul Yoo ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.1
Background: Recently, quantitative hepatitis B surface antigen (qHBsAg) levels in chronic hepatitis B (CHB) have been described. However, data on qHBsAg levels according to the presence of hepatocellular carcinoma (HCC) is insufficient. Weaimed to describe and compare qHBsAg levels in CHB patients with or without HCC. Methods: We retrospectively enrolled 739 treatment naive CHB patients from January 2009 to December 2010. We reviewed their medical record collected data including qHBsAg level, hepatitis B virus (HBV) DNA, and disease status when HBsAg level was quantified. Presence of HCC was defined as described in KASL guideline. qHBsAg levels were compared using student’s t- test or ANOVA between HCC and non-HCC patients. Results: Two hundred eighteen patients (29.5%) had HCC. Mean value of qHBsAg (log IU/mL) level was 2.53 ± 1.17 in patients with HCC and 3.03 ± 1.32 in non-HCC patients (p<0.000) and HBV DNA (log IU/m) level was 4.13 ±2.25 and 4.3 ± 2.71 (p=0.419), respectively. qHBsAg level was compared in patients with HCC vs without HCC according to each phase of CHB: 3.20 ± 0.58 (n=36) vs 4.10 ± 0.68 (n=146) in HBeAg positive hepatitis (p<0.000), 2.26 ± 1.13(n=60) vs 2.66 ± 1.27(n=277) in HBeAg negative hepatitis (p=0.027), 3.30 ± 0.35 (n=12) vs 3.49 ± 0.77 (n=28) in HBeAg positive hepatitis with liver cirrhosis (LC) (p=0.059), and 2.37 ± 1.27 (n=110) vs 2.09 ± 1.29 (n=70) in HBeAg negative hepatitis with LC. In 218 patients with HCC, qHBsAg level was 2.46 ± 1.24 in patients with LC (n=122) and 2.61 ± 1.06 without LC (p=0.346). Conclusions: In this study, qHBsAg level was not higher in patients with HCC than in patients without HCC. This tendency was observed regardless of the phase of CHB.