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소수 잔존치를 가진 상악에 Bar와 Locator<SUP>®</SUP>를 이용한 임플란트 융합 국소의치 치료 증례
김성종(Seong-Jung Kim),배은빈(Eun-Bin Bae),전영찬(Young-Chan Jeon),정창모(Chang-Mo Jeong),윤미정(Mi-Jung Yun),이소현(So-Hyoun Lee),허중보(Jung-Bo Huh) 대한치과의사협회 2017 대한치과의사협회지 Vol.55 No.8
Treatment with removable partial denture is effective for partially edentulous patients who are unable to obtain sufficient retention and stability for functional and esthetic restoration. There are several cases reporting the improvement of retention and stability of the partial denture using a small number of implants. However, there are limited studies on the implant-assisted removable partial denture using a small number of remaining teeth and the bar locator system. The bar locator system has an advantage in that it could compensate the angle of insertion of removable prosthesis on implant with inconsistent placement angle due to anatomical constraints compared to when using the locator only. This case report describes the patient with Parkinson°Øs disease who was treated with the Locator bar system using two previously placed implants and two remaining teeth on maxilla. No additional implants could be placed because of the medical and economic condition of the patients, and the angle of one of two implants could not be matched with the direction of the removable partial denture insertion. Considering the angle of the implants, the patient was treated with implant-assisted RPD using the Locator bar system and had satisfactory results in the aspect of esthetics, masticatory function, and oral hygiene maintenance.
광섬유형과 벌크형 ESPI를 이용한 압력용기 내부 결함 측정에 관한 비교 연구
김성종(Seong-Jong Kim),강영준(Young-June Kang),홍경민(Kyung-Min Hong),이재훈(Jae-Hoon Lee),최낙정(Nak-Jung Choi) 한국비파괴검사학회 2012 한국비파괴검사학회지 Vol.32 No.2
ESPI는 비접촉·비파괴 방식으로 측정 대상체의 진동이나 변형에 따른 3차원 형상 정보의 취득에 효과적으로 사용되어 왔다. 측정 대상체와 계측 환경에 따라 면내, 면외, 전단간섭 등으로 구분할 수 있으며, 간섭계를 구성하는 광소자의 형태에 따라 벌크형과 광섬유형으로 나뉜다. 광섬유형 시스템은 크기가 작고 휴대하기 편하여 시스템 구성 및 정렬이 매우 용이하다. 본 논문에서는 광섬유 면외 ESPI를 이용한 광학계를 구성하였고, PZT를 이용하여 위상 변조를 π/2만큼 주기적으로 가하여 CCD 카메라에서 이미지를 획득하였다. 획득한 스페클 패턴 이미지는 후처리 과정을 통해 측정 대상체의 3차원 위상 정보를 얻게 된다. 내부 결함이 존재하는 압력용기에 질소 가스를 주입하여 변화되는 phase map을 관찰하였고, 또한 phase map의 후처리를 통하여 압력에 따른 대상체의 변화를 3차원으로 확인하였다. An optical defect detection method using ESPI(electronic speckle pattern interferometry) is proposed. ESPI is widely used as a non-contact measurement system which show deformation and phase map in real time. ESPI can be divided as the in-plane, out-of-plane and shearography by operation principle and target object and also divided with bulk type and optic fiber type by the optic configurations. This paper is focused on optic fiber type out-of-plane ESPI, which has the following advantages: (1) low cost; (2) reduction of the unreliable factors generated by separated optic components; (3) simplification of the optic configuration; (4) great reduction of volume; (5) flexibility, to be easily designed into different structures to adapt to inaccessible environments such as pipeline cavity and so on.
전기화학적 가속 부식 평가법에서 강재의 부식 손상에 미치는 인가전류밀도의 영향
이정형(Jung-Hyung Lee),박일초(Il-Cho Park),박재철(Jae-Cheul Park),김성종(Seong-Jong Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.5
In this study, we investigated the corrosion damage characteristics of steel for offshore wind turbine tower substructure using an accelerated electrochemical test. The galvanostatic corrosion test method was employed with a conventional 3 electrode cell in natural sea water, and the steel specimen was served as a working electrode to induce corrosion in an accelerated manner. Surface and cross-sectional image of the damaged area were obtained by optical microscope and scanning electron microscope. The weight of the specimens was measured to determine the gravimetric change before and after corrosion test. The result revealed that the steel tended to suffer uniform corrosion rather than localized corrosion due to active dissolution reaction under the constant current regime. With increasing galvanostatic current density, the damage depth and surface roughness of surface was increased, showing approximately 25 times difference in damage depth between the lowest current density (1 ㎃/㎠) and the highest current density (200 ㎃/㎠). The gravimetric observation showed that the weight loss was proportionally increased with increment of current density that has 75 times different according by experimental conditions. Consequently, uniform corrosion of the steel specimen was conveniently induced by the electrochemically accelerated corrosion technique, and it was possible to control the extent of the corrosion damage by varying the current density.
해양환경용 알루미늄 합금의 플라즈마 전해 산화 시 표면 특성에 관한 불화칼륨(KF)의 영향
이정형(Jung-Hyung Lee),김성종(Seong-Jong Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
In this study, we investigated the influences of potassium fluoride(KF) addition on the surface characteristics of plasma electrolytic oxidation(PEO) coating produced on Al alloy. The PEO of marine grade Al alloy(5083 grade) was conducted in KOH 1g/L solution adding different concentrations of KF(0, 1 and 2 g/L) under a galvanostatic regime. With KF addition, unusual behavior was observed on the voltage-time characteristic curves, which can be characterized by the following process: (i) initial rapid increase in voltage (ii) a short plateau after 1st breakdown (iii) gradual increase in voltage (iv) intermittent fluctuation of voltage after 2nd breakdown. The SEM observation revealed irregular surface morphology with KF addition, as compared with one formed without KF addition, which had a reticulate structure. The XRD analysis detected the formation of aluminium hydroxide fluoride hydrate(H4.76Al₂F3.24O3.76) on surface grown by PEO process with KF. Particularly, at very early stage of the process (~ 120 s), thin film was formed having nanoporous structure, and F element was confirmed on surface by EDS analysis. The thickness and surface roughness of the coating increased with increasing KF concentration. As a result, KF addition was found to be less beneficial influences on PEO of marine grade Al alloy, and therefore needs further research to improve its capability.
해수 내 초음파 진동 캐비테이션에 의한 폴리우레탄 수지 도막의 내캐비테이션 성능 평가
이정형(Jung-Hyung Lee),김재학(Jae-Hak Kim),김용표(Yong-Pyo Kim),김성종(Seong-Jong Kim) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.5
The anti-cavitation performance and damage characteristics of polyurethane coatings containing carbon nano-fibers (CNF) as reinforcement were investigated using the ultrasonic vibratory method in seawater (ASTM G32-10). Two commercial anti-cavitation coatings, glass flake-reinforced vinyl esther and urethane-modified epoxy, were used for comparison. During the cavitation tests, the cumulative mean depth of erosion (CMDE) was determined, and damage development against exposure time was evaluated for each coating using optical microscopy. A significant difference was found in the performance of the four polyurethane coatings. The polyurethane coating without CNF provided the least protection against cavitation attack, suggesting the added CNF improved and reinforced the resilience of the coating against impact pressure produced by cavitation bubble collapse. Excellent cavitation resistance was also exhibited by the polyurethane coating composition when fluorine was added, an improvement that may be attributed to the synergistic effect of CNF and fluorine on the polyurethane structure.