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탈회된 법랑질과 복합레진계 시멘트의 접착시 레진돌기 길이에 관한 주사현미경적 연구
박창근,장완식,양재호,이선형,Park, Chang-Keun,Chang, Wan-Shik,Yang, Jae-Ho,Lee, Sun-Hyung 대한치과보철학회 1987 대한치과보철학회지 Vol.25 No.1
The purpose of this study was to compare the resin tag length of 3 composite resin cements: Panavia, Compspan, Conclude, and the resin tag length of Panavia cemented to daliva-contaminated enamel using scanning electron microscopy. The following conclusions can be drawn from this study. 1. The resin tag length of panavia was $8.29{\mu}m$, compsan $8.72{\mu}m$, conclude $7.74{\mu}m$, and Panavia cemented to saliva-contaminated enamel $3.92{\mu}m$. 2. No significant difference of resin tag length between Panavia, Comspan and Conclude could be observed. 3. Saliva contamination of etched enamel surface decreases the wettability of composite resin cement.
최대교합 및 기능교합시 하악구치부 연장가공의치에 발생하는 응력에 대한 삼차원 유한요소법적 연구
박창근,이선형,정헌영,양재호,Park Chang-Keun,Lee Sun-Hyung,Chung Hun-Young,Yang Jae-Ho 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.4
Cantilever bridge is widely used by mny clinicians, but its worst mechanical character, so called Class I lever system, makes dentists hesitate to restore the missing tooth with it. Therefore it is important to study stress of the cantilever bridge. In this study, two models of cantilever bridges that restores the missing mandibular second molar with two abutment teeth were constructed. One model was a type of cantilever bridge supported by a normal alveolar bone, the other one was supported by an alveolar bone resorbed to its 1/3 of root length. Maximum bite force(550N) and funtional maximum bite force(300N) were vertically applied to the distal end of the pontic, distal 1/3, and distal half of the pontic. And each force was also applied to centric occlusal contacts as a distributed force. Total 16 loading cases were compared and analyzed with 3-dimensional finite element method. The results were as follows: 1. The stress was concentrated on the joint of the pontic and the retainer, grooves, and distal cervical margin of the posterior retainer. 2. In case of maximum bite force(550N) at the end of the pontic, the risk of fracture at the joint of the pontic and the retainer was high. 3. In case of distributed force in centric occlusion and functional maximum bite force(300N), the stresses were less than the yield strength of the type VI gold for any loading cases. 4. In case of alveolar bone resorption, the occlusal force to the cantilever pontic caused more stress on the root apex and less stress on the alveolar crest region of the distal surface of the posterior abutment. 5. In case of alveolar bone resorption, the displacement was larger than that of normal alveolar bone in all loading cases.
Waldenstrom`s Macroglobulinemia 에 의해 유발된 사구체 신염 1 예
박창근(Chang Keun Park),신태원(Tae Won Sin),권대식(Dae Sik Kwon),김지섭(Ji Sub Kim),정재성(Jae Sung Chung),공진민(Jin Min Kong),김호균(Ho Gun Kim),김병창(Byung Chang Kim),김혜숙(Hae Sook Kim),김용진(Yong Jin Kim) 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.5
Waldenstrom's macroglobulinemia(WM) is a disorder of malignant proliferation of plasmacyoid lymphocytes and monoclonal immunoglobulin M. The renal complications of WM are less common and severe than that of multiple myeloma. We present a case of WM which involved the kidney as massive proteinuria, hematuria and renal failure. A biopy specimen of the kidney reveals the intraglomerular hyaline thrombi of immunoglobulin M paraprotein. Three cycles of plasmapheresis and systemic chemotherapy with chlorambucil and prednisolone show improvement in his renal manifestations. We suppose the glomerulonephritis caused by hyaline thrombi in WM may be reversible, at least in its early stage.
수두 예방접종의 시행여부에 따른 수두의 임상경과의 차이
박창근 ( Chang Keun Park ),김혜원 ( Hye One Kim ),박천욱 ( Chun Wook Park ),이철헌 ( Cheol Heon Lee ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.8
Background: Varicella is a disease caused by varicella zoster virus with vesicular skin eruption. Usually the symptom improves automatically though there have been rare cases, that developed serious complications. It can be prevented by immunization with live attenuated varicella vaccine. But among immunized children breakthrough varicella has been reported in about 5~20%. Objective: The aim of this study is to evaluate the effects of live attenuated varicella vaccine on clinical course of varicella. Methods: A total of 104 varicella patients were divided into two groups; vaccinated and unvaccinated. We evaluated patients about the demographic characters and clinical features of varicella through interview and medical examination. Because varicella is more serious in adolescents and adults, we also divided the patients into two groups by age of 12 for male and 10 for female. Results: The immunized group showed a statistically noticeable distinction. The patients showed more mild prodromal symptoms, small amount of rash in oral mucosa, and on the palms and soles. Small counts of total skin lesion and less itching were observed. They also required a shorter period of hospital treatment and disease duration. Conclusion: Immunization is known to decrease the incidence of varicella, but the study also confirmed that immunization can weaken serious symptoms in breakthrough varicella. (Korean J Dermatol 2008;46(8):1011~1019)
박창근 ( Chang Keun Park ),최지훈 ( Ji Hoon Choi ),김혜원 ( Hye One Kim ),박천욱 ( Chun Wook Park ),이철헌 ( Cheol Heon Lee ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.2
Latex is the milky sap obtained by tapping the rubber tree, Hevea brasiliensis. The prevalence of latex allergy has been on the increase alongside the wider use of latex-manufactured products. The number of reports of latex-induced anaphylaxis during operation is therefore increasing. We report the case of a 56-year-old male patient who developed severe anaphylactic shock while under anesthesia when the tourniquet was deflated during elbow arthrolysis. A subsequent allergy workup revealed an IgE-mediated hypersensitivity to latex. (Korean J Dermatol 2008;46(2):241∼244)
유,소아기 아토피피부염이 환아의 삶의 질과 가족에 미치는 영향
박창근 ( Chang Keun Park ),박천욱 ( Chun Wook Park ),이철헌 ( Cheol Heon Lee ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.5
Background: Atopic dermatitis (AD) in children may profoundly affect their quality of life (QOL), in addition to familial life plus cause financial burden. Objective: The aim of this study was to show how AD affects children`s QOL, family life and contributes to financial burden, and to evaluate this relationship with severity of AD. Methods: The target population comprised of children aged 0~6 years with AD who visited our out-patient department between May 2004 and October 2005. The Infants` Dermatologic Quality of Life Index (IDQOL), the Dermatitis Family Impact questionnaire (DFI) and the Financial Impact questionnaire (FI) were used to quantify the impact of AD on each area. Eczema severity was assessed using the Eczema area and severity index (EASI) score. The student` T-test and simple linear regression were used for statistical analysis. Results: A total of 101 children completed all the questionnaires. The mean score for IDQOL was 11.50, DFI was 10.05 and FI was 16.10. The highest scoring question for IDQOL was itching and scratching, the lowest one was family activities. For the DFI they were main carer`s life effect and shopping. The mean score of EASI was 8.81 and this was linearly related with IDQOL (R2=0.126, p<0.001), DFI (R2=0.154, p<0.001) and FI (R2=0.145, p< 0.001), but not as highly. Conclusion: We have shown that children`s quality of life, family life and financial burden are related to the severity of AD. The IDQOL, DFI and FI may potentially be of value to help guide appropriate management of AD and can be used as an added parameter in clinical trials involving AD management. (Korean J Dermatol 2007; 45(5):429~438)
박창근(Chang-Keun Park),이명원(Myeong Won Lee),조선영(Sun-Young Cho),김진한(Jinhan Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅱ
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