牙科包埋材料快速鑄鈦之研究

目的：本研究的目的是探討兩種牙科包埋材料應用快速鑄造技術鑄鈦之可行性。方法：實驗選用兩種市售專用鑄鈦包埋材料(Rematitan Plus and Tancovest)，測試包埋材各種物性、即凝固膨脹、抗壓強度、熱膨脹率，以及測量鈦金屬鑄造物的尺寸精密度與表面粗糙度。結果：實驗結果顯示，兩種包埋材以快速加熱方法處理後的熱膨脹率為0.39至0.64%，包埋材料加熱前的生胚強度(Green strength)為4.4至10.3MPa，加熱後強度為13.8至17.6MPa。使用快速鑄造技術鈦鑄件的尺寸精密度約為-0.57%，表面粗糙度(Ra)為1.91至3.10μm。包埋材的加熱方式對於鑄造物的尺寸精密度與表面粗度沒有影響(p>0.05)。結論：兩種實驗包埋材料具有應用快速鑄造技術鑄鈦之可行性。
The purpose of this study was to investigate the possible use of an accelerated casting technique to cast titanium. Two commercial investments, Rematitan Plus and Tancovest, were used to examine the results of using such accelerated casting techniques expansion setting, thermal expansion and compression strength. We also measured dimensional accuracy and surface roughness of the titanium castings. We found that residual thermal expansion of the investments at the casting temperature ranged between 0.39% and 0.64%, green strengths ranged between 4.4 and 10.3MPa and the fired strengths between 13.8 to 17.6MPa. The dimensional accuracies of castings made with the accelerated casting technique were approximately -0.57%. The surface roughness (Ra) of the castings ranged from 1.91 to 3.10μm. The heating method did not significantly influence the accuracy and the surface roughness of the titanium castings (P>0.05). These results suggest that these commercial investments can be used for the accelerated casting of titanium.