수종의 글라스 아이오노머 수복재의 불소 유리량과 2급 와동 수복시 인접 치아의 법랑질에 미치는 항우식 효과에 관한 비교 연구

윤병근,김용기 단국대학교 치의학연구소 1995 단국대치의학연구소논문집 Vol.7 No.1

산부식전 수종의 법랑질 표면 처리과정이 레진 결합력에 미치는 효과 : BOND STRENGTH ANALYSIS AND SEM STUDY 전단강도 분석 및 주사 전자현미경 연구

윤여상,김용기 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.1

The purpose of this study was to evaluate the effect of various enamel surface treatment methods prior to etching on the resin-to-enamel bond strength and surface morphology. The measurement of shear bond strenght was done using Universal Testing Machine and the surface structure was observed through Scanning Electron Microscope with the following results : 1. Group with pumice prophylaxis demonstrated the highest mean value among the tested groups and Group Ⅰ,Ⅲ and Ⅳ in declined order respectively. 2. The fracture patterns observed mainly was an adhesive type with similar distribution in all groups with the characteristic higher frequency of cohesive type in Group Ⅱ. 3. Pumice treated enamel surface showed quite sinilar surface structure to normal enamel surface whereas Group Ⅲ demonstrated general precipitation of organic materials and Group Ⅳ revealed the sparse precipitation of the material which is assumed to be the reaction products of hydrogen peroxide. 4. After acid etching, Group Ⅱ showed a similar pattern of typical acid etching of normal enamel, while Group Ⅲ showed the general amorphous appearance and Group Ⅳ with the white frosty appearance.

신이식 환자에서 EBV감염과 관련된 악성 임파종 2예

윤선애,진동찬,김용수,신완식,윤영석,방병기,최영진,심상인,고용복 大韓移植學會 1993 Korean Journal of Transplantation Vol.7 No.1

Glutaraldehyde의 농도 및 pH에 따른 항균효과 및 결체조직에 미치는 자극에 관한 비교연구

윤형석,김용기 大韓小兒齒科學會 1993 大韓小兒齒科學會誌 Vol.20 No.1

The purpose of this study was to compare the antmicrobial and irritational effects of various glutaraldehyde groups under defferent concentrations along with pH levels on two species of microorganisma,S.aureus and S. sanguis, and dorsal connective tissue of 16 Sprague Dawley rats. The results can be summarized as follows: 1.The intensity of antimicrobial effects on two tested species increased as the concentration of glutaraldehyed got higher. 2.Buffered groups demonstrated stronger antimicrobial effects over unbufferde groups under all tested concentrations and showed statistically significant differences(<0.05) except 10% S. sanguis group. 3.The results of connective tissue reaction study showed the general increased in severity of tissue irritation and in the diffusion of fixed tissue layer. 4.No apparent histological differences could be found in the degree of tissue irritation between buffered and unbuffered glutaraldehyde groups. 5.The overall picture of histological ovservation demonstrated the decrease of inflammatory response with time and no notably different findings bwtween experimental groups were indicated after 4 weeks of test periods.

상아질 결합제가 컴포머의 불소유리에 미치는 영향에 관한 연구

윤여상,김종수,권순원,김용기 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.2

본 연구의 목적은 와동 충전시 충전재와 지질 사이에 개재되는 상아질 결합제가, 수복물에서 유리되는 불소가 와동 벽으로 침투하는 과정에 어떠한 영향을 주는지를 조사함이었고, 부가적으로 레진 강화형-글라스 아이오노머 시멘트의 접착에도 상아질 결합제를 도포하는 것이 체질과의 결합력을 강화시킬 수 있는지에 대해 평가하고자 하였다. Fuji II LCR와 Dyract APR를 선정하여 상아질 결합제의 도포 여부에 따른 불소 유리량 측정과 전단 결합 강도도를 비교분석하였으며, 치질 내로의 불소 침투 양상은 교환 시기에 있는 재2유구지에 Fuji II LCR와 Dyract APR를 충전하고 3주내에 발거하여 EPMA필 분석하였다. 상아질 결합제는 불소 유리량을 현저하게 감소시키는 것으로 나타났으며(p<0.05) Fuji II LCR의 경우 상아질 결합제의 도포가 결합강도를 증가시키지 못하였다. EPMA분석결과 상아질 결합제는 충전재로부터 유리되어 나오는 불소가 치질 내로 확산되는 것을 방해하는 것으로 확인되었다. It is well known that glass-ionomer cement and compomer can release fluoride which can inhibit the progresion of dental caries. The purposes of thins study were to evaluate whether the fluoride from fluoride-containing ailing materials can penetrate the dentin bonding adhesive and the dentin bonding adhesive can increase the bond strength of resin-modified glass lonomer. The amount of fluoride release from resin-modified glass lonomer and compomer was measured during 28 days of period find statistically analyzed by t-test. The bond strength of each material with/without dentin bonding adhesive was measured and also statistically analyzed by t-test. The distribution of fluoride from each material into the tooth was explored by electron probe microanalysis system (EPMA). The expenmental teeth used were second primary molars about to exfoliate. The amount of fluoride from each material was diminished by dentin bonding adhesive during 28 days(p<0.05) and the bond strength was not increased by dentin adhesive in resin-modified glass ionomer. The bond strength of group VI was not detectable. The distribution of fluoride from earth material into teeth was according to dentino-enamel junction and dispersed into pulp from pulpal floor. The widest distribution was shown in resin-modified glass ionomer cement filled without the application of dentin bonding adhesive.

부분적 무치증을 동반한 법랑질 형성부전 환자의 치험례

윤형석,김용기 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.2

Enamel hypoplasia may be defined as an incomplete formation of the organic enamel matrix of teeth can be derived from a variety of local and systemic factors. A 9-year-old female patient with a chief complaint of abnormal crown shape with partial anodontia came to the clinic for complete rehabilitation. Family history revealed the presence of notched central incisors in her brother and VDRL was performed to rule out congenital syphilis which responded positively in this case. Functional orthodontic appliance were delivered to increase vertical dimension and hypoplastic teeth were restored either stainless steel crown or composite resin restoration. Congenital missing and extracted areas were recovered by delivering upper and lower removable acrylic partial dentures.

수종의 글라스 아이오노머 수복재의 불소 유리량과 2급 와동 수복시 인접 치아의 법랑질에 미치는 항우식 효과에 관한 비교 연구

윤병근,김용기 단국대학교 치의학연구소 1995 논문집 Vol.7 No.1

The purpose of this study was evaluated for fluoride release of various kinds of glass ionomer filling materials to deionized distilled water, the fluoride uptake and the anticariogenic effect on the adjacent tooth after class Ⅱ restoration with glass ionomer materials. Ketac-Silver, Miracle-Mix and Dyract were used as restorative material for this study. Fluoride concentration released to the solution from discs made of the above mantioned selected materials were measured daily for the first seven days, and then weekly, on the on the 14th and the 21st day. After class Ⅱ restoration with glass ionomer materials, the amount of released fluoride absorbed by the enamel of the adjacent tooth, and the anticariogenic effect on it was measured and observed, respectively. The results can be summarized as follow : 1. The largest amount of fluoride was released in each group first day, and the amount decreased as time went on. Miracle-Mix released more fluoride than all of the other materials tested. 2. The difference in the amount of fluoride released by Groups Ⅰ and Ⅱ, Groups Ⅱ and Ⅲ, and Groups Ⅰ and Ⅲ was statistically significant(p<0.05), except that between Groups Ⅰ and Ⅲ on the first, second and third days. 3. The amount of fluoride absorbed by the adjacent enamel showed statistically significant difference each groups (p<0.05). The fluoride uptake of Group Ⅰ was greater than that of Group Ⅲ, and Group Ⅱ, greater than that of Group Ⅰ(p<0.05). 4. In comparing lesion depth, all experimental groups decreased lesion depth than control group (p<0.05). The decrease was greatest for Group Ⅱ and least for Group Ⅲ (p<0.05).

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.

해저형상에 따른 연안유속분포형상

김웅용,윤영호,연기석 大田産業大學校 1997 한밭대학교 논문집 Vol.14 No.1

This paper aims at the elucidation of the characteristics of longshore current profile after wave breaking. Wave breakers are always accompanied by complex turbulent process, wave energy losses and the mean water level variations due to the gradient of radiation stress. These processes with other factor result in the development of longshore currents. Because longshore current have relation to the alongshore sand transport on a bed and, to the diffusion of contaminants nearshore region, the understanding and elucidation of longshore currents are very important from tile engineering point of view. The longshore currents induced by simple wave striking an planar beach, nonplanar beach, and barred beach are calculated.

착화제와 유기산이 Wistar rat체내의 Sr 분포에 미치는 영향

이기호,이제호,박상윤,이승훈,유용운,윤택구 대한방사선 방어학회 1990 방사선방어학회지 Vol.15 No.2

Wistar rat에 85SrCl2를 꼬리 정맥에 주사하여 체내 기관과 혈액 내 분포, 잔존율을 조사하였고 착화제와 유기산을 투여하여 혈장 단백질에 결합하는 Sr양의 변화를 측정하였다. 혈액내에서 Sr은 혈장에 60%, 세포에 40%부착되어 이동하였다. 혈장에 존재하는 Sr중 약 50%정도는 혈장 단백질과 결합한 상태였고, 세표에는 세포 표면에 가볍게 부착되어 있었다. Erythrocyte나 granulocyte보다 lymphocyte에 많은 양의 Sr이 부착되어 있었다. 투여후 초기 1시간 이내에 혈액 내에서 급격히 감소하여 뼈에 침착되었다. 이때 각 기관에서도 Sr의 잔존율은 24시간 이내에 크게 감소하였고, 뼈로 침착된 Sr은 24시간 이후에 서서히 감소하였다. 착화제 EDTA, EGTA 및 DTPA를 투여한 경우, 혈장 단백질에 결합하는 Sr의 양은 대조군의 57%에서 27-33%로 감소하였으며 citrate 및 oxalate의 투여시는 이값이 19%와 40%로 각각 감소하였다. 85SrCl2 was injected to the tail vein of Wistar rats and investigated its distribution and clearance in the tissues and blood. We also measured the changes in Sr binding to the blood plasma protein by administrating chelating agents and organic acids. For the blood, 60% of the Sr occurred in the plasma and 40% on the cell membrane. Fifty percent of Sr in the blood plasma was bound to plasma protein. Sr on the cell membrane seemed to be bound loosely. The binding in the lymphocyte was higher than in the erythrocyte and granulocyte. Within one hour Sr was quickly disappeared from the blood stream, to be accumulated in the bone. Twenty four hours after the injection, Sr decreased rapidly in the organs of soft tissue, but slowly in the bone. The binding of Sr to plasma protien decreased from 57% of the control to 27-33% in the group treated with chelating agents. EDTA. EGTA and DTPA and to 19% and 40% in the groups treated with organic acids, citrate and oxalate, respectively.