數種의 弗素製材에 의해 前處置 再植 齒牙의 祖織學的 反應에 關한 硏究

金鐘秀,金殷淑,金鐘好,金容琦 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.2

The effect of fluoride pretreatment upon root resorption after delayed replantation was studied in beagle dogs. Upper and lower incisors were extracted and bench dried for 45minutes. 1% Stannous Fluoride solution, 2% neutral sodium fluoride gel and 1.23% acidulated phosphate fluoride gel were used for the pre-treatment of replanted root surface in the experimental groups. Replantation was done with no treatment in control group. After of an experimental periods 3 weeks, animals were sacrificed by perfusion followed by sample preparation. A histomorphometric method was applied for evaluation of tissue reactions observed in each group under light microscope. Scanning electron microscopic observation was done to find out any different surface topography between groups. The results were as follows: 1. Fluoride-treated groups showed in general the better healing patterns than untreated control group. 2. Comparisons between three experimental groups revealed the superiority of APF-treated group over the other groups in terms of tissue healing reaction by showing the highest frequency in uncomplicated healing pattern and surface resorption and the lowest in inflammatory resorption, but with no statistical significance(p>.05) 3. Scanning elecron micrographs showed the irregular distribution of resorption cavitie s and the attached bone of variable size and shape in all groups. 4. It can be conclued that the types of fluoride did not have significant impact on the early tissue reactions after delayed replantation under the condition of the present experiment.

지혈적 치수 절단술의 효과에 관한 조직학적 연구

김종여,김종수,김용기,최장규 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.1

The efficacy of several polpotomy methods were svaluated histologically on animal model using 6 beagles. At 1, 4, 6 weeks after pulpotomy, animals were sacreficed by perfusion method. Histomorphometric analysis was performed using computerized image analyzing system. Statistical comparisons were done using SPSS program. The following results were obtained: 1. Tissue responses after ferric sulfate treatment mainly consisted of fibrous ourface layer with the underneath pulpal tissue layer containing well-preserved odontoblasts. 2. Bleeding, fibrosis and necrosis are the main reactions obsereved in electrosurgical pulpotomy and the normal pulpal tissues were limited to the apical portion. 3. In the aspect of preserving the normal pulpal tissue, ferric sulfate pulpotomy was evaluated to be superior to formocresol or electrosurgical pulpotomy.

遲延再植 時 齒根處理에 따른 齒周組織의 治癒에 關한 硏究

김종여,김종수,김용기,임성수 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.1

The purpose of this study was to analyze comparatively the effect of various root pretreatments prior to delayed replantation. Total 6 beagle dogs were used for the experiment and 8 teeth per each animal were treated by several prepared regimens before replantation. After 3 & 6 weeks of experimental periods, animals were sacrificed by perfusion method. The results obtained form the present study can be summarized as follows: 1. All root pretreatment regimen used in this experiment showed effectiveness in the periodontal repair of delayed replanted teeth. 2. The teeth treated by the regimen of stannous fluoride combined with tetracycline revealed more favorable tissue response and less frepuent root resorption or ankylosis than other groups. 3. The long term effect of Group Ⅳ-regimen seems to be worth further study since the result at 6-weeks showed the significant progress in periodontal healing when compared to 3-week result which was not indicated in any other group.

DIFOTI 영상 최적화를 위한 광량에 대한 연구

김종빈,김종수,유승훈,김용기 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1

기존 DIFOTI 시스템의 문제점 중 디지털 영상 처리의 개선을 위하여 light emitting diode(LED)를 광원으로 사용하여 prototype DIFOTI 시스템을 개발하였다. 효율적이고 우수한 화질을 제공 할 수 있는 광량을 산출하기 위해 1일부터 20일까지 유치 법랑질을 Carbopol 907 인공 우식 용액을 사용하여 탈회시키고 실험 기간에 따른 법랑질 탈회 정도를 기존의 DIFOTI 시스템과 영상 분석을 통해 비교 평가하였으며, 탈회 정도에 대한 gold standard로 사용된 편광 현미경 소견과 비교하여 다음과 같은 결론을 얻었다. 1. 탈회 기간에 따라 두 시스템 모두 탈회 법랑질의 광도가 감소하는 양상을 보였다. 2. 정상 및 탈회 법랑질간의 광도의 차이는 DIFOTI 시스템이 prototype DIFOTI 시스템보다 더 큰 값을 보였다. 3. 편광현미경 관찰 소견과 비교해 볼 때, DIFOTI 시스템은 병소 깊이와 매우 유사한 변화 양상을 보여준 반면, prototype DIFOTI 시스템은 병소 깊이의 변화를 충분히 반영하지 못하였다. 보다 우수한 영상을 얻기 위해서는 광량의 최적화 과정과 함께 디지털 카메라의 조리개 조절도 병행되어야 할 것으로 판단되며, 이러한 단점은 소프트웨어적인 보완을 통해 개선될 수 있을 것으로 사료된다. This study was performed to compare the quality of image processing between the newly developed prototype using light emitting diode(LED) and the conventional DIFOTI system(EOS Inc., USA). To estimate the optimal light emitting power for the improved images, primary enamel surfaces treated under Carbopol 907 de-mineralizing solution were taken daily during 20 days of experimental periods by both DIFOTI systems. The results of comparative analyses on the images obtained from both systems with polarized image as gold standard can be summarized as follows: 1. Trans-illumination indices of images taken from primary enamel surfaces were decreased with time in both systems. 2. The differences of intensity of luminance between sound and de-mineralized enamel surface in prototype DIFOTI system was shown to be relatively smaller than conventional DIFOTI system. 3. From the comparative analysis of images from both DIFOTI system with polarized images as gold standard, the difference between sound and de-mineralized enamel surface of intensity of luminance of DIFOTI system was more correlated to polarized images than prototype of DIFOTI system. With the optimal LED emitting power, the control of aperture of digital camera is considered as the another key factor to improve the DIFOTI images. For the best image quality and analysis, the development of the improved image processing software is required.

Lip Bumper를 이용한 치료의 성공과 실패

김용기,김종수,김종빈,맹명호 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.3

혼합치열기의 소아환자의 경미한 하악 전치부의 총생을 해결하는 문제와 하악 제 2 유구치의 조기 상실로 인한 하악 제 1 대구치의 근심경사 그리고 이에 따른 제 2 소구치의 맹출 공간 부족등을 해소하기 위한 여러가지의 방법들이 시도되어왔지만 저마다 그 술식의 적용범위나 방법 등에는 많은 어려움 들이 있어왔다. 이 연구의 목적은 이런 선택이 어려움을 가만하여 실제 임상에서 보다 간편하고 환자의 불편감을 줄여줄 수 있는 한 방법으로 Lip bumper를 이용한 술식을 소개하고 그 적용례를 통하여 성공과 실패 사례들을 소개함으로써 임상가들에게 보다 유익한 정보를 주기 위함이다. In the mixed dentition,many chidren have mild crowing of anterior dentition on the mandibular arch and mesial of mandibular molar.Lip bumper have been used to gain arch length for the alignment of mild to moderate crowded dental arches.As such,they may provide an alternative to extraction therapy.The claimed therapeutic effect of the lip bumper is bodily forward incisor movement,flaring of the low incisors,and distal tipping of the molar.The dental changes can be attributed to removal of lip pressure on the lower anterior dentition and the distal forces exerted at the molar at the abutment.The purpose of this study is to show more easily method of treatment for mild anterior crowding of mandible.

내구성을 고려한 표면피복재의 성능평가에 관한 실험적 연구

김영덕,조봉석,윤종기,김용로,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

It is recognized that reinforcement corrosion is the main distress behind the present concern regarding concrete durability. The basic method to prevent reinforcement corrosion is coating the reinforcement concrete with surface coating materials but evaluating their performance is necessary to the work satisfactory because they have different performance for each other. In this study. to evaluate performance of surface coating materials, we compare their properties in terms of sticking strength and permeability of carbonation, chloride ion and water with actual reinforcement corrosion under environment of complex deterioration. The results showed that an increase in age also decreases Carbonation velocity coefficients, increases Chloride ion diffusion coefficients and increases water absorption coefficients. As well, an increase in age also increases corrosion of reinforcement due to permeability of carbonation and chloride ion. And sticking strength of inorganic coating material is higher than organic coating material.

한국 정신장애의 역학 조사 연구[I] : 각 정신장애의 유병률

조맹제,함봉진,김장규,박강규,정은기,서동우,김선욱,조성진,이준영,홍진표,최용성,박종익,이동우,이기철,배재남,신정호,정인원,박종한,배안,이충경 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.4

Objectives : This study aims to estimate the prevalence of the DSM-IV psychiatric disorders in Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI). Methods : Subjects were selected by taking multi-stage, cluster samples of 7,867 adult household residents, 18 to 64 years of age, in ten catchment areas. Total 78 trained interviewers administered the K-CIDI to the selected respondents, from June 1 to November30,2001. Results : Total 6,275 respondents completed the interview. Some 33.5% of respondents reported at least one lifetime disorder, 20.6% reported at least one-year disorder, and 16.7% reported at least one-month disorder. The most common lifetime disorders were alcohol abuse/dependence (17.24%), nicotine dependence/withdrawal (11.19%), specific phobia (5.16%), and major de-pressive disorder (4.25%). The lifetime prevalence of substance abuse/dependence (0.25%) and schizophrenia (0.16%) was very low. Nicotine and alcohol use disorder showed very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among female than male. Conclusion : The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in distributions of psychiatric disorders across the areas and times were observed.

Chloral Hydrate 경구투여 후 진정 효과가 나타나지 않은 소아환자에 대한 Enflurane의 사용

김용기,김종수,윤형배,이상민 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.3

진정요법을 위한 경구 투여 약물에는 비교적 안전하고 부작용이 적은 것으로 알려진 chloral hydrate 가 있으나,체내에 흡수되는 용량이 환자에 따라 다양하여 이것에 대한 정확한 측정이 어렵고,환자의 불안 정도와 주변환경 등의 영향을 받아 약효발현이 충분히 이루워지지 않는 경우가 적지 않다.이런 경우 환자와 보호자 모두에게 고통과 불편함을 줄 수 있으며,재내원시의 치료도 더욱 어려워지는 고충을 흔히 겪게 된다.이런 문제점을 해결하기 위해 chloral hydrate와 midazoam의 추가투여,chloral hydrate와 hydroxyzine,또는 이산화질소-산소와 함께 사용하는 등 소아환자의 행동조절을 위한 많은 연구와 노력이 시행되어지고 있다.본 증례에서는 hloral hydrate 경구 투여 후 진정효과가 나타나지 않은 37명의 소아환자에게 이산화질소-산소와 함께 Enflurance을 사용하여 초기 수면을 유도하여 다음과 같은 결과를 얻었다. 1.Enflurance 투여 및 국소마취 시행시 말초 동맥혈 산소 포화도와 이완기 혈압의 변화는 관찰되지 않았으며 정상범위 내에서 안정된 양상을 보였다(P<0.05). 2.Enflurance 투여 및 국소마취 시행시 심박수와 수축기 혈압의 일시적인 변화가 관찰되었지만 곧 정범위내로 회복되었으며 안정되었다(P<0.05). 3.Enflurance 투여 후 바람직한 행동양상(Q:Quiet)의 증가를 관찰할 수 있었다. 4.안정된 생징후와 바람직한 행동양상으로 재 내원의 약속을 하지 않고 97%이상이 치료를 성공적으로 마칠 수 있게 되어 환자,보호자,술자 모두에게 만족할 만한 결과를 준 것으로 평가되었다. Chloral hydrate is one of the most widely used sedative agents to control the difficult to treat young age group in the dental clinic.We are often frustrated to see the patient still awake and cry with agitation even after far more than the normal onset time.In such a cases,the patient has to be resceduled for another sedation visit with different agents and/or routes which greatly disappoints the guardians.This case report presents a sedative regimen that can possible help the clinician complete scheduled treatment without postponement.We have tried sleep induction with Enflurane (1-1.5vol%) for 60 seconds to 37 patients of those who failed to respond properly to the dose(70mg/kg)of oral Chloral hydrate.The average age and weight of the patients was 34.4 months(22-43mo.)and 14.9kg(11-2kg)respectively.It is suggested that sleep induction with low dose Enflurane produced a stable state during dental treatment with respect to vital sign and behavior.Evidence of adverse effect was not detected or reported during and/or after procedures.

유치와 영구치 상아질의 전처리 시간에 따른 표면 미세구조 변화와 글라스 아이오너머 수복재의 결합력에 관한 연구

김종수,김용기,이창근 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.4

The main purpose of this study was to evaluate the effect of dentin with various pretreatment application time on the dentin surface structure and the bond strength of glass ionomer restorative matrials between primary and permanent tooth. There are difference of composition, structure and pretreated effect of dentin conditioning between the primary and permanent teeth. Inspite of thease fact, we used the same application time of permanent tooth. This study intends to determine the most effective application time using SEM analysis of the surface change by dentin conditioning. Forty five intact primary and permanent teeth were splited mesiodistally with seperating diamond disk. Each eight specimens were prepared for shear bond strength test.(randomely devided eight group as follows:) group Ⅰ conditioning for five seconds group Ⅱ conditioning for ten seconds group Ⅲ conditioning for fifteen seconds group Ⅳ conditioning for twenty seconds Additional specimens were prepared to SEM analysis. The result are as follows: 1. Primary teeth are higher shear bond strength in group Ⅰ and group Ⅱ. 2. There was no statistically significant difference between primary and permanent teeth in group Ⅲ and group Ⅳ. 3. In SEM analysis, smear layer removal by dentin pretreatment of primary teeth was faster than permanent teeth. Primary teeth may require shorter pretreatment time of dentin for G-Ⅰ restoration than that of permanent teeth.

광 전달 쐐기를 이용한 중합 방법이 레진 충전물의 미세 누출과 미세 경도에 미치는 효과

김종수,김용기,서용석 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.4

The purpose of this study was to test the hypothesis that the more thorough cure of lightactivated composite resin could be obtained if a new way of delivering the light source deep through the resin body is developed when compared to the conventional bulk cure or incremental cure. Using cylindrical resin blocks and natural teeth, various curing conditions were tested for their effects on the degree of microleakage and microhardness. Data were analyzed statistically using One-Way ANOVA and Scheff's Multiple Range test. The results of the present study were as follows: 1. The increment of reduction in microhardness with depth was shown to be higher in group Ⅰ and Ⅱthan in group Ⅱand Ⅴ. 2. At the level of lower inner surface and the bottom surface, significantly lower micrehardness values were obtained in group I and Ⅱ when compared to group Ⅲ, Ⅳand Ⅴ. Group Ⅳshowed the lowest value among three groups (Ⅲ,Ⅳ,Ⅴ) representing the only statistically significant difference from group Ⅴ(p<.05). 3. Differences between groups in the degree of microleakage detected were shown to be statistically significant (p<.05) with the exception of group Ⅳ and Ⅴ at both occlusal and gingival margins. 4. Based upon the above-mentioned results, commonly cited recommendation of incremental curing is strongly supported and the light-transmitting wedge insertion method can be considered as a effective and feasible clinical procedure for the better curing of composite resin. However, more studies under a variety of conditions should be compoeted before this method is applied actually to the clinical setting.