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目的：评价不同烘烤温度下铸造镍铬合金后，钛接圈内层污染及成分扩散程度。方法：选择临床骨融合种植义齿二期手术后典型病例石膏模型，在基托上固定纯钛接圈，常规制作桥架蜡型，使桥架接圈周围嵌体厚度为１ｍｍ，常规内外层包埋，放置２４ｈ后，分４组不同温度烘烤：ａ组升温至６００℃，ｂ组升温至６５０℃，ｃ组升温至７００℃，ｄ组升温至８００℃。每组试件１０个，共４０个试件。用远红外温度测试仪控制合金浇注温度为１３０６℃，自然冷却，喷砂打磨将有钛接圈部位制作金相试件，进行电镜、能谱分析。结果：不同烘烤钛接圈温度熔合镍铬合金均存在钛接圈内表面污染，有包埋料成份，也有镍铬合金成份，范围达０．６ｍｍ。结论：烘烤温度在６５０℃－７００℃时，钛接圈内层包埋料污染程度相对较小。
OBJECTIVE: To evaluate the inner layer contamination and diffusion of titanium after casting Ni-Cr alloy at different baking temperatures. Methods: A typical case gypsum model after the second phase operation of prosthesis implantation in clinical bone was selected. The pure titanium ring was fixed on the base, and the wax pattern of the bridge was made. The thickness of inlay around the bridge was 1mm, After being placed for 24h, it was baked in four different temperature groups: a group heated to 600 ℃, b group heated to 650 ℃, c group heated to 700 ℃, d group heated to 800 ℃. Each group of 10 specimens, a total of 40 specimens. With far-infrared temperature tester control alloy pouring temperature of 1306 ° C, natural cooling, sand blasting will have titanium contact parts of the production of metallographic specimens for electron microscopy, energy spectrum analysis. Results: The temperature of the inner surface of the titanium ring was different from that of the titanium alloy ring. The inner surface of the titanium ring was contaminated by the temperature of the titanium alloy, and the content of the nickel-chromium alloy was 0.6mm. Conclusion: When the baking temperature is in the range of 650 ℃ -700 ℃, the pollution degree of the embedded material in the titanium ring is relatively small.