Continuous Wave of Condensation Technique으로 근관충전시 치근면 온도상승 분석

김영주,황윤찬,김선호,황인남,최보영,정영진,정우남,오원만 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.4

This study was conducted to evaluate safety to the supporting tissues of the root while the root canal is obturated using continuous wave of condensation technique. A extracted maxillary central incisor was prepared for repeated canal obturation. After conventional access opening, working length was then established to the point 1㎜ from anatomical root apex. The root canal was prepared with GT rotary Ni-Ti file (Dentsply Maillefer, Switzerland). Five thermocouples (Onega Engineering Inc., USA) were placed at 2㎜ increments on one side beginning 1㎜ from the anatomical root apex and the other five thermocouples at 2㎜ increments on the other side beginning 2㎜ from it. For obturation, a nonstandardized medium size gutta-percha cone and a ML Buchanan plugger (Analytic technologies, USA) were selected. After drying of root canal, AH 26 root canal sealer (Dentsply Detrey, Germany) was applied on the wall of the root canal. Baseline temperature was measured on the root surface. The ML size plugger was preheated for 2seconds and then the real temperature of it was recorded before insertion into the root canal. The root canal was obturated with continuous wave of condensation technique as described by Buchanan. The root surface temperature was recorded during obturation and it was performed ten times at each of the following temperature settings: 150℃, 200℃, 250℃ and 300℃. After completion of the temperature recording, the dentinal-cementum thickness at each sites where thermocouples were attached was measured. The data were analyzed using one-way ANOVA followed by Scheffe's test and linear regression test. The results were as follows. 1. When the temperature was set at 150℃, 200℃, 250℃ and 300℃ on the digital display of System B HeatSource, the real temperature of the plugger at the 1㎜ point from the tip revealed 130.82±2.96℃, 158.00±5.26℃, 215.92±6.91℃ and 249.88±3.65℃ respectively. 2. The position of 8 ㎜ from the anatomical apex showed the highest temperature increase at each temperature settings and it was significantly higher than those of other positions (p<0.01). The temperature rise was constantly increased toward coronal portion from apex of the root. 3. The maximum temperature increase on the root surface was 2.37±0.09℃ at 150℃ setting, 3.11±0.12℃ at 200℃ setting, 3.93± 0.09℃ at 250℃ setting and 5.69± 0.15℃ at 300℃ setting. These results suggest that it be relatively kind to the supporting tissues of the root that the root canal is obturated using continuous wave of condensation technique at 150℃, 200℃, 250℃ and 300℃ temperature settings on digital display of System B HeatSource.

Continuous Wave of Condensation Technique으로 근관충전시 치근면 온도상승 분석

김영주,황윤찬,김선호,황인남,최보영,정영진,정우남,오원만 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.4

This study was conducted to evaluate the temperature rise on the root surface while the root canal is being obturated using continuous wave of condensation technique. Maxillary central incisor was prepared for repeated canal obturation. Ten thermocouples (Omega Engineering Inc., Stanford, USA) were placed at 1mm increment from the anatomical root apex. The real temperature of Buchanan plugger was recorded before insertion into the root canal. The root canal was obturated with continuous wave of condensation technique as described by Buchanan and the root surface temperature was recorded during obturation at 150℃, 200℃, 250℃ and 300℃ temperature settings of System B HeatSource (Model 1005, Analytic technologies, Redmond, WA, USA). After completion of the temperature recording, the dentinal-cementum thickness at each sites was measured. The data were analyzed using one-way ANOVA followed by Scheffe's test and linear regression test. The results were as follows. 1. When the temperature was set at 150℃, 200℃, 250℃ and 300℃ on the digital display of System B HeatSource, the real temperature of the plugger at the 1mm point from the tip revealed 130.82±2.96℃ 158.00±5.26℃, 215.93±6.91℃ and 249.88±3.65℃ respectively. 2. The position of 8 mm from the anatomical apex showed the highest temperature increase at each temperature settings and it was significantly higher than those of other positions (p<0.01). The temperature rise was constantly increased toward coronal portion from apex of the root. 3. The maximum temperature increase on the root surface was 2.37±0.09℃ at 150℃ setting, 3.11±0.12℃ at 200℃ setting, 3.93±0.09℃ at 250℃ setting and 5.69±0.15℃ at 300℃ setting respectively. These results suggest that it be relatively kind to the supporting tissues of the root that the root canal is obturated using continuous wave of condensation technique at 150℃, 200℃, 250℃ and 300℃ temperature settings on digital temperature display of System B HeatSource.

Haemophilus influenzae 티올 과산화효소의 특성

황영선(Young Sun Hwang),김강화(Kanghwa Kim) 전남대학교 생활과학연구소 2000 生活科學硏究 Vol.10 No.-

Haemophilus influenzae HI0571 protein that shows homology to E. coli thiol peroxidase uses yeast thioredoxin system as an electron donor[Hwang. Y. S., Chae. H. Z., and Kim. K. (2000) J. Biochem. Mol. Biol. 33, 514~518]. The microorganism has two open, reading frames. HI1158 and HI0084, showing homology to a thioredoxin reductase and a thioredoxin, respectively. Both proteins consisting thioredoxin system were expressed in E. coli, and then the proteins were subsequently purified. The H. influenzae thioredoxin system showed 5.5’-dithiobis-(2-nitrobenzoic acid) reduction activity. H, influenzae HI0751 protein, thiol peroxidase was characterized using the thioredoxin system as an electron donor. The thiol peroxidase showed the thioredoxin dependent peroxidase activity. And glutamine synthetase protection activity of thiol peroxidase against Thiol/Fe³⁺/O₂ system was enhanced by addition of the thioredoxin. An antioxidant function of thiol peroxidase in intact cells was demonstrated by the observation that E. coli cells overexpressed with H. influenzae thiol peroxidase were less sensitive to growth inhibition by alkyl hydroperoxides.

외음부의 기저세포암

김보영 ( Bo Young Kim ),황선정 ( Sun Jung Hwang ),박병준 ( Byung Joon Park ),이은실 ( Eun Sil Lee ),한호섭 ( Ho Suap Han ),김용욱 ( Yong Wook Kim ),김태응 ( Tae Eung Kim ),노덕영 ( Duck Yeong Ro ),이안희 ( An Hi Lee ) 대한산부인과학회 2010 Obstetrics & Gynecology Science Vol.53 No.9

Basal cell carcinoma (BCC) is the most common human malignant neoplasm, accounting for 75% of all non-melanoma skin cancer. The incidence of BCC is strongly correlated with sun exposure as well as older age. Therefore, the vast majority of BCCs is observed in elderly patients on the sun-exposed skin of the head and neck with a frequency of more than 80%. BCC is very rare on sun-protected skin such as the perianal and genital regions and other etiologic factors must be considered in these cases. Although the pathogenesis of vulvar BCC is unclear, early diagnosis is very important. Because BCC in these areas sometimes seems innocuous, it is recommended that a biopsy of all suspect lesions be performed. We report a woman with BCC of the vulva treated with wide local resection and reviews the literatures on this subject.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

대동맥 협착증과 동반된 출혈성 위장관 동정맥 기형에서 Estrogen-Progesterone 치료 1예

김도연,김화정,김효정,남준식,박수영,박영미,신정은,주미순,황민규,정혜경,손혜영,이선영,이한주 大韓消化器內視鏡學會 1999 Clinical Endoscopy Vol.19 No.부록2

두가지 혈류 유발방법에 의한 새로운 심폐소생술(이중 혈류 유발 심폐소생술)장치의 개발

황성오,김현,조준휘,오범진,임종천,최경훈,윤정한,이승환,김영식,이강현,이윤선 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Background: There have been many efforts to augment blood flow during cardiopulmonary resuscitation. These efforts have focused on maximizing the effect of cardiac pump or thoracic pump alone. However, considering that the heart is the biggest blood reservoir and increase of intrathoracic pressure can generate blood flow, simultaneous exploitation of both mechanisms may have synergistic effect. We hypothesized that simultaneous chest constriction in addition to sternal compression by standard CPR may have additive hemodynamic effects by preventing deformation of the chest and increase of intrathoracic pressure. Methods and results: we built a new mechanical device to perform compression and thoracic constriction simultaneously. The device consists of two main elements. Piston in the center is to depress the sternum. Strap is to constrict the thorax circumferentially. Strap is attached to both sides of the piston. When the piston is pushed down, it depresses the sternum and pulls on the thoracic strap. To determine strap width to produce optimal hemodynamic effect, we measured hemodynamic parameters with variable widths of strap in two dogs after induction of ventricular fibrillation. Result of the experiment showed that 10cm wide strap was determined to be most effective. We also determined optimal depth of compression to produce maximal hemodynamic effect with animal experiments using two dogs. Animal experiments showed that the highest aortic pressure could be generated when the stemum was depressed to 5 cm. Cardiopulmonary resusciation using a new device could generate higher systolic aortic pressure, coronary perfusion pressure and end-tidal carbon dioxide tension in comparison with standard cardiopulmonary resuscitation in a pilot animal study using two dogs. Conclusion: New cardiopulmonary resuscitation method using a mechanical device designed by us could perform sternal compression and simultaneous thoracic constriction, and generate better hemodynamic effects than standard cardiopulmonary resuscitation in pilot animal experiments.

중학교 가정과 학습내용에 대한 예비중학생과 학부모의 인식

황선화,정영숙 한국 가정과 교육 학회 1995 한국가정과교육학회지 Vol.7 No.2

The purpose of this study was to investigate the recognition degrees of contents in Home Econimics textbook for middle school students among pre-middle school students and their parents. It is for developing better Home Econonmics textbook. Three objectives of this study were: 1) To find the recognition degrees of the fact that Home Economics subject is supposed to utilize for not only girls, but boys students in middle schools in 1996 among pre-middle shcool students and their parents. 2) To find the degrees of necesiity in each field of Home Economics subject among pre-middle school students and their parents. 3) To find the differences in recognition degrees of understandings, attitudes, and skill of Home Economics subject between pre-middle school students and their parents. Questionnaire survey metod was utilized to 1,205 sizth grade students and their parents in Pusan. The results of this study as follows; 1) It was low that the recognition degrees of the fact that Home Economics subject is supposed to utilize for both girls and boys in middle school among both pre-middle school students and their parents. This result implies that it is important to dissenminate the curriculum change in Home Economics practice to the public. 2) It was high that the recognition degrees of necessity in each field of Home Economics subject among pre-middle school students and their parents. Th recognition defree were different according to sociodemographic factors. That is, ① the recognition degrees of students were lower than their parents; ② the recognition degrees of parents who have high education were higher than those who have low education; ③ the recognition degree of an evirionmental field was highest. 3) There were little differences between pre-middle school students and their parents in the recognition degrees of understandings, attitudes, and skills of Home Economics subject: The recognition degrees of girls fathers showed higher scores than boys fathers those of in understandings and skills of Home Economics subject. The recognition degrees of girls fathers showed higher scores than those of girls in attitudes of Home Economics subject.

肢발생중 세포 증식성에 미치는 Etretinate의 영향에 관한 연구

황정연,김은영,박선화,전용혁 고려대학교 의과대학 1994 고려대 의대 잡지 Vol.31 No.1

Cell proliferation in the developmental sequence of fore-limb in the DDY mouse with the adverse effect of single dose of etretinate (Tigason®) on it correlated to the drug-induced dysmorphogenesis was studied by measns of argyrophil technique for nucleolar organizer regions(AgNORs) and expression of proliferating cell nuclear antigen(PCNA). The number of AgNORs per nucleus displayed regional differences in the limb bud on day 11 of gestation, as higher values in apical ectodermal ridge(AER) and growing tip but decreased rapidly thereafter compared with those in the other parts of epithelia and subepithelial mesenchyme, while in core mesenchyme where the higest in its value on day 11, the numbers decreased depend not on the age but on the chondrified stage specific. Antibody reaction to PCNA expressed in almost all of the cells, stronger in mesenchyme than in epithelia on day 11 and then decreased gradually with the development proceed. Siver reactions to NORs as well as PCNA expression were decreased sharply by etretinate but recovered gradually from 24 hours after treatment except the value of AgNORs in the chondrified mesenchyme. The results Indicate that growth conducted by AER with subridge mesenchyme and chondrification in the core mesenchyme are two of major processes in the early development of limb, and the adverse effects of etretinate on proliferation and differentiation persist longer in the chondrified area but decreased expression of proliferative activities by the drug do not appear to be the result subsequent to the drug-induced cell death. The results suggest that temporal inhibition or interruption of the proliferation could deprive the programmed sequence of development of its appropriate timing with subsequent disturbance of the pace in growth which might be a role of limb dysmorphogensis but the drug's affinity to the chondrified cells remains a question.

CaS : Ce와 Ca_1-χSr_χS : Ce 형광체의 Photoluminescence 특성

황해선,이우교,김영욱 동의대학교 기초과학연구소 1995 基礎科學硏究論文集 Vol.5 No.1

CaS:Ce and Ca_1-χSr_χS:Ce phosphors have been prepared using the sulfurizing flux method and the result of measuring photoluminescence is presented two peaks with extensively strong intensity, when flux (Na₂CO₃) is mixed 30 mol% and activator doped 0.1 mol% in the host (CaS). The two peaks of CaS:Ce phosphor are appeared at 513㎚ and 576㎚ wavelengthes when liminescenct transition in Ce^3+ is given as 5d(²D)→4f(²f_5/2) and 5d(²D)→4f(²f_7/2) and that of Ca_1-χSr_χS:Ce phosphor are shifted toward short wavelength as much as 30㎚ when χ is changed from 0 to 1, but the shape of wavelength is not varied.