대한치과보철학회지 (The Journal of Korean Academy of Prosthodontics)

  • 제45권4호
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  • Pages.522-533
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  • 2007
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  • 0301-2875(pISSN)
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  • 2005-3789(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
권호 표지

주입선 형태가 타이타늄 합금의 주조성에 미치는 영향

THE EFFECT OF CASTING MACHINE AND INVESTMENT ON THE CASTABILITY OF TITANIUM

  • 김상태 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 방몽숙 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 양홍서 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 박상원 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 박하옥 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 임현필 (전남대학교 치의학전문대학원 치과보철학교실)
  • Kim, Sang-Tae (Department of Dental Science, Graduate School, Chonnam National University) ;
  • Vang, Mong-Sook (Department of Dental Science, Graduate School, Chonnam National University) ;
  • Yang, Hong-So (Department of Dental Science, Graduate School, Chonnam National University) ;
  • Park, Sang-Won (Department of Dental Science, Graduate School, Chonnam National University) ;
  • Park, Ha-Ok (Department of Dental Science, Graduate School, Chonnam National University) ;
  • Lim, Hyun-Pil (Department of Dental Science, Graduate School, Chonnam National University)
  • 발행 : 2007.08.31
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초록

Statement of problem: Despite of the recent development of the titanium casting system methods, the casting defects such as imperfect casting and internal porosity were frequently observed. Purpose: The purposes of this study were to compare and measure the castability, microhardness, and surface reaction between Grade 2 pure titanium and Ti-6Al-4V by casting these alloys from the different sprue design conditions. Material and methods: Depending on the sprue designs and titanium alloys, 42 ready-made wax patterns were used. By analyzing the remodeling of the cast, internal porosity, microhardness, and titanium surface layer of SEM, there were several results we observed. Results: 1. The measured castability of titanium were categorized in the ascending order: individual sprue group, runner bar group, and single group. This data are based on the statistically signigicant differences. 2. The castability of titanium has not showed the statistically significant differences among the alloys. However, CP-Ti groups were superior to Ti-6Al-4V groups by showing the noticeable castability. 3. The surface layers of the castings of all groups have showed $5{\mu}m$ titanium oxide layers irrespective of sprue designs and titanium alloys. Conclusion: From the above study results, by fabricating the restorations from the centrifugal casting machine direct sprue designs revealed better castability. As we increased the number of sprues in the wax pattern, it revealed better castability. The castability of pure titanium rather than that of Ti-6Al-4V was remarkable. To fabricate the complex forms of the restorations, further researches on the efficient sprue designs and titanium alloys must be made.

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