주입선 형태가 타이타늄 합금의 주조성에 미치는 영향

김상태; 박상원; 양홍소; 방몽숙; 박하옥; 임현필

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주입선 형태가 타이타늄 합금의 주조성에 미치는 영향
The effect of casting machine and investment on the castability of titanium

대한치과보철학회지 2007년 45권 4호 p.522 ~ 533

김상태, 박상원, 양홍소, 방몽숙, 박하옥, 임현필,

소속 상세정보

김상태 ( Kim Sang-Tae ) - 전남대학교 치의학전문대학원 치과보철학교실
박상원 ( Park Sang-Won ) - 전남대학교 치의학전문대학원 치과보철학교실
양홍소 ( Yang Hong-So ) - 전남대학교 치의학전문대학원 치과보철학교실
방몽숙 ( Vang Mong-Sook ) - 전남대학교 치의학전문대학원 치과보철학교실
박하옥 ( Park Ha-Ok ) - 전남대학교 치의학전문대학원 치과보철학교실
임현필 ( Lim Hyun-Pil ) - 전남대학교 치의학전문대학원 치과보철학교실

KMID : 0362420070450040522

Abstract

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{μ}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.