• Restorative Dentistry and Endodontics
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• 제26권5호
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• pp.418-435
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• 2001

Root canal preparation process is of utmost importance in successful treatment of root canal. Also, one of the most important purpose of the root canal preparation is to enlarge the root canal three dimensionally without changing the curvature of the root canal However as the curvature of the root canal increases, there are many difficulties involved in formation of optimum root canal. Therefore in order to solve the above mentioned problems, new developments in methods of root canal preparation and equipments for such purposes were made. Recently, vigorous studies about newly introduced engine-driven nickel-ti-tanium rotary file are conducted. As shown in research results to dates, it is well established that the use of nickel-titanium file is better suited for curved root canal than stainless steel file in maintaining the curvature or root canal and reducing the deformation of root canal. However it is also acknowledged that there are a few discrepancies in research results according to protocol, due to failure to remove variables in experiments. In addition, although it is recommended by the manufacturer that the GT rotary file should maintain a low rotational speed of 150~350rpm and 'light pressure' as light as not to break the lead of a pencil, academic studies about the vertical force which is not yet standardized are not sufficiently explored. Therefore, this research devised and utilized a special research equipment to standardize the appropriate range of vertical force for GT rotary file through experiments by breaking of the lead of a pencil as expressed by the manufacturer and to accurately measure factors involved through repeating and recreating the environment of root canal preparation. Forming nine experimental groups by varying the vertical forces (150g. 220g, 300g) and rpm (150rpm, 250rpm, 350rpm), the effects of changing vertical forces and rpm on working efficiency were measured in terms of time expended in root canal preparation by crown-down method using a transparent resin block with 35 degree curvature and GT rotary file (z-test). The following research using this special research equipment that involved nine experimental groups and varying the vertical force for root canal preparation from 300g which is within the normal vertical force range to 700g and 1000g which fall outside the normal rpm range. The results were as follows : 1. Analysis of the experiment results revealed that the time spent in root canal preparation decreased as the vertical forces and rpm increased (p<0.05). Also, the effects of rpm were greater than those of the vertical forces within the normal vertical force range ($\beta$-weight test). 2. Observation of the deformation of GT rotary file revealed that deformation increases in a direct correlation with the vertical force increase and in a reverse correlation with the rpm decrease. In the case of the vertical forces close to the normal range, the probability of GT rotary file deformation were quite different depending on the rpm changes. In the case of greater vertical forces, the occurrences of deformation of the file were more frequent regardless of the rpm changes. 3. Deformation and breakage of file were also commonly observed in the expended time measurement experiments and GT rotary file deformation experiments in which low speed rpm (150rpm) was used and at the curved portion of the resin block.

• 디지털융복합연구
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• 제12권3호
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• pp.391-397
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• 2014

본 논문에서는 21세기 신성장 동력산업으로 세계적인 관심을 받고 있는 의료관광에 대해서 살펴보고자 한다. 의료와 관광이 협조적인 구도하에서 시너지 효과를 가져오게 되는 의료관광은 2009년을 원년으로 도약하기 시작하여 2012년 현재 괄목한 성장을 보이며 성장하고 있다. 본고에서는 성장하는 의료관광시장을 조망해보고 향후 지속적인 발전과 글로벌 한국의료의 성장을 위해 발전적 제언을 하고자 한다. 이를 위해서한국의 5대 대형병원의 의료관광객 유치에 대해 살펴보고 이를 근거로 의료비의 투명한 관리와 적극적인 서비스를 위한 홈페이지 구축, 의료업계와 관광업계의 협력구도제안 및 의료커뮤니케이션의 활성화를 제안한다. 즉 질병위주의 치유목적적 의료관광객의 정확한 의사소통을 위한 전문의료 통역사의 양성과 의료관광의 원할한 진행과 서비스를 위한 국제의료코디네이터양성의 이중 채널 커뮤니케이션이 필요하다. 또한 의료계에 비해 상대적으로 열악한 관광업계의 인프라 구축을 위한 창의적인 노력이 필요함을 지적하였다.