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구철인,정재헌,최한철,Koo Cheol-In,Chung Chae-Heon,Choe Han-Cheol 대한치과보철학회 2004 대한치과보철학회지 Vol.42 No.2
Statement of problem: Implant screw loosening has been remained problem in restorative practices. Surface treatment of screw plays a role of preventing screw from loosening in implant screw mechanism. Purpose : The purpose of this study was to investigate surface characteristics of TiN and ZrN film ion plated screw with titanium and gold alloy screw and to evaluate wear resistance, surface roughness, and film adhesion on screw surface using various instruments. Material and methods : GoldTite screws and titanium screws provided by 3i (Implant Innovation, USA) and TorqTite screws or titanium screws by Steri-Oss (Nobel Biocare, USA) and gold screws and titanium screws by AVANA (Osstem Implant, korea) were selected. Ion plating which is much superior to other surface modification techniques was carried out for gold screws and titanium screws using Ti and Zr coating materials with nitrogen gas. Ion nitrided surface of each abutment screw was observed with field emission scanning electron microscopy (FE-SEM, micro-diamond scratch tester, vickers hardness tester, and surface roughness tester. Results : 1) The surface of gold screw and GoldTite is more smooth than ones of other kinds of non coated screw. 2) The ZrN and TiN coated surface is the more smooth than ones of other kinds of screw. 3) The hardness of TiN and ZrN coated surface showed higher than that of non coated surface. 4) The TiN coated titanium screw and ZrN coated gold screw have a good wear resistance and adhesion on the surface. 5) The surface of ZrN coated screw showed low surface roughness compared with the surface of TiN coated screw. Conclusion : It is considered that the TiN and ZrN coated screw which would prevent a screw from loosening can be applicable to implant system and confirmed that TiN and ZrN film act as lubricant on surface of screw due to decrease of friction for recycled tightening and loosening.
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유철인,김성례,성시정,송도영,윤택림,한경구,함한희 한국문화인류학회 1996 韓國文化人類學 Vol.29 No.1
This research is to mainly reconstruct a local history of the Sosan area during the post-liberation era. The local history conveys distinct features of social and cultural changes. This study emphasizes the following ; firstly, villagers' own experiences are to be highly respected. Secondly, each village is a basic unit for study and yet is analyzed in relation to other higher order of the society as the state. Thirdly, an individual's life is crucial for a better understanding of the local history. The villagers had communicated with the outside world in a restricted way through marketing and maintaining marriage ties until the early 1960's. Thereafter, the sphere of village life has increasingly expanded : due to the development of mass transportation and spread of public education. Networks for marketing have been widened, and migration of family members have formed a currency. Accordingly communications of the villagers with larger cities has become more important compared to the one with neighboring villages. The villagers currently enjoy easier access to larger cities like Inch' on and Seoul and stronger social ties with those cities. Expansion of the sphere of village life has transformed the nature of political, economic, social and cultural nexuses in the village. What deserves most notice is that such nexuses have changed. Before the implementation of the land-to-tiller program in the 1950's, landlords had ruled over tenant-peasants. The land-to-tiller program enabled the former tenants to be petty landowners. In this process, villagers experienced clash of contradictory ideological pursuits. Some villagers preserved the traditional moral code and others tried to follow a new ideological trend of the day. Whichever the way villagers took in the process of land reform, they struggled with themselves in the choice of economic advantages and moral justification for their behavior and thought. As the influence of the central government and capitalists increased, the tone of local dignitaries were softened. The government implemented agricultural development programs to enhance living standards of villagers. Capitalists endorsed the government's developing policy. To this end, the corporations participated in various projects regarding economic development including land reclamation. The Hyundai Corporation played a key role in the Sosan Land Reclamation. While some villagers benefitted from this project, others, particularly the former fishermen in Pusok-myon, were faced with negative effects of the same project. The fishermen were deprived of their means of livelihood. They launched s series of movements for the compensation of for their loss. The development of such movements witnessed the emergence of new leadership. New leaders were armed with their own ability and achievement, and they were instrumental in success of the movements supported by the mass. The villagers also started movements against both the state and the corporation in a cultural way. They invented new rituals to cope with social change caused by the land reclamation, and restored some traditional rituals in a new form and spirit. However, invention or restoration of the rituals was not necessarily a product of unanimity in decisions and actions among the populace. The government and some prominent figures of the village also took part in such rituals with their own interest. Life histories reveals how social changes have affected individuals and a families. and at the same time, how individuals have interpreted such changes. Subjects in life histories were largely concerned with economic survival rather than social change unless those changes caused them troubles. life histories exhibit not only individuals' experience but also social and cultural characteristics of the Sosan area. In an area like Sosan, while has been dominated by the non-yangban or the weaker residents to seek for humble yet profitable jobs rather than to rely on yangban (a traditional class of nobility since the Choson dynasty) ideologies. Family members, who are in charge of their families' livelihood took pride in themselves. And their sacrificial attitudes toward parents and siblings were highly praised by their neighbors. However, in recent years some of them began to give in such pride and regret the fact that they had neglected schooling of their children. It reflects values and world-views newly forming within their minds. Life histories collected in this area can be valued as texts and contexts that helps us to grasp the depth of the local history.
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이흥태,구철인,박찬익 朝鮮大學校 口腔生物學硏究所 2002 口腔生物學硏究 Vol.26 No.1
Polymers are the dominant material for fabrication of denture base. However, resin base can't fufill the patients' satisfactions completely and solve the pronunciation problem and prevent the denture fracture. In spite of many advantages, metal denture bases do not widespread in clinical practics. The main reasons are the difficulties in fabrication and additional time and cost, inability to rebase such prostheses. The use of the metal base can be one of options in complete denture treatments. This study helps, through reveiwing previous reports and literature about the metal base, metal base to be useful in the clinical application by recommend the materials, indications and advantage/disadvantage of the metal base and introduce variable designs. The clinical application of the metal base have many advantages. but the dentists have to select cases carefully and apply designs according to patient's various conditions. In conclusion, the use of the metal base can't alternate treatment of inadequate conventional complete denture. Adequate complete denture is very important for the treatment of the metal base complete denture.
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광중합성 수지를 이용한 파절된 도재 소부 전장 금관의 수복에 관한 치험례
정재헌,김정희,구철인 朝鮮大學校 口腔生物學硏究所 1987 口腔生物學硏究 Vol.11 No.-
Last several decades, many studies have been reported on prosthodontics using porcelain which is esthetic materials. This porcelain has been used in denture porcelain teeth, porcelain laminate veneer, porcelain fused to metal crown and porcelain jacket crown. The porcelain fused to metal crown is most porpular among these porcelain used prosthetics. The porcelain of porcelain fused to metal crown may be fractured due to lack of adhesion between porcelain and metal, disharmony of thermal contraction, abnormal occlusion, careless treatment of wrong design, etc. Therefore, there have been many porgress in restoration of fractured porcelain fused to metal crown. There are several metho in restoration of fractured porcelain fused to metal crown. 1. The porcelain fused to metal overcasting method. 2. The porcelain fused to metal pin retained casting method. 3. The method using composite resin. 4. The method using acrylic resin. Among these many restorative methods, methods using light activated composite resin is comparatively easy to restore in patient mouth and can obtain esthetically good result.
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