The Influence of AH-26 and Zinc Oxide-Eugenol Root Canal Sealer on the Shear Bond Strength of Composite Resin to Dentin

Cho, Ju-Yeon,Jin, Myoung-Uk,Kim, Young-Kyung,Kim, Sung Kyo 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.3

AH-26 근관실러가 상아질에 대한 복합레진의 전단결합강도에 미치는 영향을 평가하기 위하여 144개의 발거된 대구치를 실린더형의 몰드에 매식한 다음 치관부의 상아질 표면을 노출시킨 후 편평하게 연마하고 AH-26을 도포한 군, ZOE paste를 도포한 군 및 실러를 도포하지 않은 대조군으로 나누어 One-step 상아질 접착제를 처리한 후에 Charisma (Heraeus Kulzer, Germany) 복합레진을 적용하고 광중합시켰다. 시편을 분리하여 37℃ 항온조에 24시간 보관후 Instron test machine (Model 4202, Instron Corp., USA)을 이용하여 시편의 전단 결합 강도를 측정하고 one-way ANOVA 및 Tukey's studentized rank test로 통계 분석하였다. AH-26 근관실러로 처리한 군과 대조군은 ZOE 근관실러 처리군에 비해 유의하게 놓은 접착강도를 나타내었다 (p<0.05). AH-26 근관실러 처리군과 아무 처리하지 않은 대조군 사이에는 결합강도에 있어 유의한 차이를 나타내지 않았다 (p>0.05). 본 연구의 조건에서는 ZOE 근관실러는 상아질에 대한 복합레진의 전단결합강도를 저하시키는 반면 AH-26 근관실러는 유의한 영향을 미치지는 않는 것으로 보인다. 따라서 임상에서 근관실러로 AH-26을 사용한 근관충전 후에는 즉시 복합레진 코어를 해 주어도 결합력에 저해가 없을 것으로 여겨진다. The purpose of this study was to evaluate the influence of the AH-26 root canal sealer on the shear bond strength of composite resin to dentin. One hundred and forty four (144) extracted, sound human molars were used. After embedding in a cylindrical mold, the occlusal part of the anatomical crown was cut away and trimmed in order to create a flat dentin surface. The teeth were randomly divided into three groups; the AH-26 sealer was applied to the AH-26 group, and zinc-oxide eugenol (ZOE) paste was applied to the ZOE group. The dentin surface of the control group did not receive any sealer. A mount jig was placed against the surface of the teeth and the One-step dentin bonding agent was applied after acid etching. Charisma composite resin was packed into the mold and light cured. After polymerization, the alignment tube and mold were removed and the specimens were placed in distilled water at 37℃ for twenty four hours. The shear bond strength was measured by an Instron testing machine. The data for each group were subjected to one-way ANOVA and Tukey's studentized rank test so as to make comparisons between the groups. The AH-26 group and the control group showed significantly higher shear bond strength than the ZOE group (p<0.05). There were no significant differences between the AH-26 group and the control one (p>0.05). Under the conditions of this study, the AH-26 root canal sealer did not seem to affect the shear bond strength of the composite resin to dentin while the ZOE sealer did. Therefore, there may be no decrease in bond strength when the composite resin core is built up immediately after a canal filling with AH-26 as a root canal sealer.

Helicobacter pylori와 대장균의 Shuttle Vector 개발

조명제,이우곤,이상룡,김경희,안영숙,김성희,김현주,류복덕,최여정,윤영혜,백승철,전영석,이광호 경상대학교 유전공학연구소 1997 遺傳工學硏究所報 Vol.16 No.-

In this study, a vehicle vector using cryptic plasmids was constructed for gene transfer in Helicobacter pylori. pHP51(3.9 kb) and pHP489(1.2 kb) were selected for constructing vectors from cryptic plasmid of H. pylori isolates in Korea. The HindⅢ-digestedDNA fragment(1.2kb) of pHP489 and 1.6kb DNA fragment of pHP51 were ligated with a kanamycin resistance gene(aph3'-Ⅲ) from C. jejuni to produce the recombinant plasmids pHP489K and pHP51K, respectively. Transformation frequency of pHP51K by electroporation was low. But pHP489K could be effectively transformed into various H. pylori strains. In order to design an intermdiate vehicle vector for gene transfer into H. pylori, pBlueHP489K was prepared by recloning pHP489K DNA into pBluescript and pTZ19R vector. This vector permitted the DNA fragment containing pHP489 sequence, aph3'-Ⅲ, and cloned DNA to be cut and self-ligated in the SacⅠ site after cloning. ureA and ureB gene were inserted into pBlueHP489K, resulting in pBlueHP489K/AB. The DNA fragment containing pHP489, kanamycin resistance gene(aph3'-Ⅲ), and urease structural gene was cut away from pBlueHP489K/AB and self-ligated to generate pBlueHP489K/AB. pBlueHP489K/AB made urease-negative H. pylori strains restore their urease activity. By this experiment, pBlueHP489K was confirmed to be the vehicle system for transferring H. pylori genes.

바터 팽대부에 생긴 유암종 1예

강명주,지삼룡,박석주,이재익,조영완,김준영,박성재,박은택,이연재,이상혁,설상영,배상균 인제대학교 2006 仁濟醫學 Vol.27 No.-

Carcinoid tumors have been reported in a wide range of organs but most commonly involve the lungs, bronchi and gastrointestinal tract. Within the gastrointestinal tract, appendix is the most common location for carcinoid, followed by the distal small intestine, the rectum, and the stomach. Among these, primary involvement of the ampulla of Vater is extremely rare. We report a case of carcinoid tumor of ampulla of Vater. A 62-year-old man presented with epigastric soreness. Gastroduodenal endoscopy showed hyperemic bulging mass on ampulla of Vater and diagnosed as carcinoid tumor by histologic finding, with immunohistochemical study. In ^(111)In-octreoscan, tumor had regional lymph node metastasis, but no evidence of distant metastasis. Pancreatoduodenectomy with lymph node dissection was performed.

Isolation and Characterization of Antimicrobial Substance Macrolactin A Produced from Bacillus amyloliquefaciens CHO104 Isolated from Soil

( Seung Je Lee ),( Jeong Yong Cho ),( Jung Il Cho ),( Jae Hak Moon ),( Ki Deok Park ),( Young Ju Lee ),( Keun Hyung Park ) 한국미생물생명공학회 2004 Journal of microbiology and biotechnology Vol.14 No.3

약관절에 대한 외과적 적근방법

조갑주,송승희,이선재,서영진,고부일,박영주,안병근 한림대학교의료원 1994 人間科學 Vol.18 No.10

소양호 동물성플랑크톤의 수직분포

조규송,박영춘,조성주 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

본 연구는 소양호의 동물성 플랑크톤의 군집조사를 파악하기 위해 플랑크톤의 수직분포를 알아보았다. 조사기간은 1986년 3월부터 9월까지 실시하였다. 본 호수의 동물성 플랑크톤은 담수 초기에 출현된 종이 그대로 장착되고 있으나 식물성 플랑크톤은 종 및 밀도가 증가햐였으며 이는 수여고한경의 변화를 시사해 주고 있다. 개체군 밀도가 가장 높은 시기는 5월과 6월로 ㎥당 개체수가 40,000개에 달하고 가장 적은 시기는 3, 4월로 약 5,000개 정도 였다. 동물성 플랑크톤의 수직분포에서 정체기와 순화기때 서로 다른 양상을 보이는 종들로는 Keratella cochlearis, Therrnocycolps

과학의 수준별 학습을 위한 Web 기반 수업 자료의 개발

조주환,주국영 조선대학교 사범대학 부설 교과교육연구소 2001 敎科敎育硏究 Vol.4 No.1

본 연구는 과학의 수준별 교육과정 편성·운영을 효율적으로 수행하기 위해서 학생 능력과 개인차에 따른 다양한 교육의 기회를 제공하고, 자기주도적으로 학습능력을 신장시킬 수 있도록 컴퓨터를 이용하여 학습자의 학습 능력과 수준에 맞는 다양한 컴퓨터용 웹 자료들을 개발하는 데 있다. 본 연구에서 제작한 Web 기반 학습자료(WBI)는 학습자가 스스로 본시 학습에 필요한 선수학습요소를 파악하고 부족한 부분을 보충할 수 있으므로 본시 수업시 학습자의 학습 동기를 촉진시킬 것으로 기대한다. 또한 보충 학습 자료는 본시 학습 내용을 보다 상세하게 안내해 줌으로써 결손 학습 부분을 원활하게 보충해 줌으로써 학업 성취를 높일수 있을 것으로 기대한다. 따라서 제작한 Web기반 심화·보충형 수업 자료는 학습자들이 언제 어디서나 자기의 수준에 맞추어 자기 주도적으로 흥미 있게 학습할 수 있는 기초자료가 될 수 있다고 본다. 그리고 2002년부터 적용되는 수준별 교육과정인 7차 고등학교 과학과 교육과정을 수행하는데 있어서도 도움을 줄 수 있는 기초자료가 될 수 있다고 본다. 따라서 많은 웹 자료들이 개발된다면 현장의 교사들이 일선에서 활용하기에 용이하리라 생각한다. The purposes of this study are to provide students with opportunities according to their different learning abilities and levels in order to implement effectively the differentiated curriculum of science, and to develop various web data for them to improve their learning abilities for themselves. The WBI of this study is expected to stimulate the learners' motivation in class since it helps them to understand the basic knowledge and supplement the weak points. The complementary data for learning are expected to enhance learners' attainment as they show the learning tasks in detail and supplement the missed points successfully. So the advanced/complementary data for learning will be basic data that help students to learn positively given subject everywhere and everytime, and that give a aid to implement the 7th differentiate curriculum of science that will be applied in 2002. Therefore if we develop various web data, teachers will be able to apply them easily in their classrooms.

한국 서해 경기만 조간대 퇴적층의 퇴적물 특성과 층서

조주환,김영성,임동일 조선대학교 사범대학 부설 교과교육연구소 2001 敎科敎育硏究 Vol.4 No.1

경기만 반월 조간대 퇴적분지의 퇴적 층서를 밝히기 위해 2지점에서 평균 20m에 달하는 심부시추를 실시하였다. 시추된 퇴적물은 퇴적환경과 경계면의 특성에 의해 크게 2개의 퇴적단위 UnitⅠ과 UnitⅡ로 구분된다. UnitⅠ은 5-10m의 두꺼운 니질 퇴적물로 구성되며, 현세 해침기간동안 점이적인 해수면 상승과 힘께 형성된 현세 니질 조간대 퇴적층으로 해석된다. 기반암을 부정합적으로 피복하고 있는 퇴적단위 UnitⅡ는 두께가 최대 10m에 달하며, 조립의 자갈과 모래로 구성된다. 조립의 사질 퇴적물은 동해의 사구에 비하여 원마도가 낮고, 서해의 대륙붕 퇴적물보다는 높은 원마도를 나타낸다. 이러한 결과들은 UnitⅡ 퇴적물이 다소 강한 유수 작용에 의한 하천 퇴적물임을 제시한다. 결론적으로 생물 파편의 부재, 역사질의 조립한 퇴적물 조직, 쇄설성 입자의 형태 특성 그리고 층서 위치 등을 고려할 때 퇴적단위 UnitⅡ는 현세 해침이전 최대빙하기(LGM)동안 퇴적된 육성의 하천 퇴적물로 해석된다. To elucidate the stratigraphy of Banweol tital-flat deposits, Kyunggi Bay, western coast of Korea, two boreholes, up to 20 m in thickness, were taken using a well-unilized deep-drilling equipment. On the basis of depositional enviornment and erosional boundary, these deepdrilled borehole sediments can be divided into two sedimentary units(UnitⅠ and UnitⅡ). UnitⅠ reaches up to 10 m in thickness and consists mainly of mud and silt sediments with mean grain size of 7-9 phi. This unit is interpreted as a typical intertidal-flat deposition accumulated during mid-to-late Holocence sea-level rise. Beneath the Holocence tidal-flat mud(UnitⅠ) are very coarse-grained sandy sediments (UnitⅡ) woth approximately 10 m thick. Roundness in UnitⅡ sediments is lower than those of relict shelf sediments. Considering the texture, grain shape, stratigraphic position, and absence of biogenic materials, UnitⅡ might be accumulated under the active hydrodynamic condition of the fluvial enviornment during sea-level lowstand, possibly last glacial maximum(LGM).

麗水近海의 海況特性에 관한 硏究

曺炷煥,金永成,李吉洙 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

This study was done for the purpose of effectively preserving the fishing grounding which are existing and will be newly established in Yeosu coastal areas. Accordingly, the oceanegrahic conditional characteristics of these areas were investigated in February, May, September and November, 4 times each year from 1984 to 1985, that results are as follows: 1. The mean water temperature was high by 24.4℃ in Deukyang Bay in September 1984 and low by 3.8℃ in Yeoja Bay in February 1985. In comparison of water temperature with common year, it was high by 0.2~1.1℃ in February and May and low by 0.3~1.1℃ in September and November 1984, and 1ow by 1.2~2.0℃ in February to November 1985. 2. The distribution of salinity was 14.8~34.0‰ for two years:14.8~33.9‰ in 1984 and 31.2~34.0% in 1985. The mean distribution was low by 29.2‰ in September 1984 and high by 33.6% in February 1985. The distributions in each coastal area were low by 23.1% in KwangyangBay in September 1984 and high by 33.9% in the external sea of Keumsan area. In comparison of saliaity with common year, it was low by 0.2~2.0‰ in May, September and November 1984 and high by 0.5~l.6‰ in February, May and September 1985. It was high by 0.2~O.7‰ respective1y. 3. The distribution of dissolved oxygen was 3.2~88㏄/ℓ for two years : 3.5~7.8㏄/ℓ in 1984 and 3.2~88㏄/ℓ in 1985. The distribution were high by 0.7㏄/ℓ in February and low by 7.4㏄/ℓ in September 1984 and high by 7.4㏄/ℓ and low by 4.5㏄/ℓ in May 1985. The distributions in each coastal area were high by 8.4㏄/ℓ in Gamag Bay and low by 3.9㏄/ℓ in Kwangyang Bay in 1985. 1n comparison of distribution with common year, it was low by 0.1~O.3㏄/ℓ in 1984 and high by 0.2~0.6㏄/ℓ in 1985. 4.The distribution of PO_4-P was 0.Ol~5.O8㎍-at/ℓ for two years: 0.O1~5.48㎍-at/ℓ in 1984 and 0.01~3.44㎍-at/ℓ in 1985. The distribution was high by 1.65㎍-at/ℓ in Kwanyang Bay in November 1985 and low by 1.65㎍-at/ℓ in the external sea of Keumsan area. 5. The distribution of NO_2-N was 0.01~ll.7㎍-at/ℓ for two years : 0.01~8.48㎍-at/ℓ in 1984 and 0.02~ll.79㎍-at/ℓ in 1985. The distribution was low by 0.02㎍-at/ℓ in Gamag Bay in September 1984 and high by 5.32㎍-at/ℓ in Kwangyang Bay in September 1985. 6. The distribution of SiO_2-Si was 0.18~71.5㎍-at/ℓ for two year 036~71.50㎍-at/ℓ in 1984 and 0.18~27.18㎍-at/ℓ in 1985. The distributions were high by 31.81㎍-at/ℓ in Kwangyang Bay in September 1985 and low by 1.5~3㎍-at/ℓ in Yeoja Bay in May 1985.

크릴분말이 콜레스테롤 및 카드뮴 식이 흰쥐의 간 및 심장 지질에 미치는 영향

조영숙,박석규,박정로,손미예,문주석,곽수동 순천대학교 기초과학연구소 1992 基礎科學硏究誌 Vol.3 No.-

In order to investigate effects of krill on lipid components of liver and heart in cholesterol and cadmium-fed rats, male Sprague-Dawley rats were raised for 4 weeks with 8 experimental diets. Krill used in this experiment contained 65.4%(w/w) of protein and 16.7% of lipid. Krill contained 35% of polyunsaturated fatty acids and more unsaturated fatty acids than saturated fatty acids by 2 times. Amino acid content of krill was high in order of Glu, Asp, Tyr and Lys. Rats fed krill diet showed more food intake and weight gain compared with control group. However, food efficiency ratio and weight of liver and heart were not significantly different. The ingestion of cadmium resulted in a severe restriction in growth rate with normal or mild reduction of liver and heart weight. Cadmium also caused a significant decrease in food efficiency ratio. The contents of total and free cholesterol of liver and heart in rats fed krill diets were similar or slightly higher than those fed control diet. Dietary krill also showed no significant difference in liver and heart cholesterol levels in rats with cadmium ingestion. The contents of phospholipid and triglyceride in liver and heart of krill group were slightly higher than those of control group. Supplement of krill reduced triglyceride content of liver in rats ingested with cadmium without any effect on the level of phospholipid and heart lipids. The concentration of cadmium in plasma significantly increased with dietary krill. However, the krill supplement did not influence the concentration of cadmium in liver or heart. A significant accumulation of lipid in liver tissue was observed in all dietary groups but standard group. However, no difference in degree of lipid accumulation was found among the dietary groups. Necrosis and hemolysis of liver in all dietary groups were not shown.