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目的:评价高金合金、钴铬合金及镍铬合金3种不同金属基底冠的边缘适合性。方法:制作下颌第一磨牙全冠牙体制备标准金属代型1个,复制并灌注石膏模型后,制作高金合金、钴铬合金、镍铬合金基底冠各10个,依次将其就位于金属标准代型上。在体式显微镜下,对基底冠边缘与金属代型肩台之间的适合度进行观察,用CCD进行成像,并用专业图像测量软件测量边缘缝隙宽度。最后计算各组10个样本的平均值,采用SPSS11.5软件包对数据进行统计学处理。结果:高金合金、钴铬合金和镍铬合金的平均边缘缝隙宽度分别为(72.9±29.3)、(85.9±33.0)和(94.1±44.9)μm,3组之间差异显著;其中,高金合金的边缘缝隙宽度显著小于钴铬合金(P<0.01)和镍铬合金(P<0.001),而钴铬合金基底冠边缘缝隙宽度显著小于镍铬合金(P<0.05)。结论:3种瓷熔附金属基底冠的边缘适合度均在临床可接受范围,而高金合金基底冠的边缘适合度显著高于其他2种合金。
OBJECTIVE: To evaluate the edge suitability of three different metal-based crowns of high gold alloy, cobalt-chromium alloy and nickel-chromium alloy. METHODS: One mandibular first molar tooth was prepared and one standard metal was prepared. After replicating and perfusing the gypsum model, ten high-gold alloy, cobalt-chromium alloy and nickel-chromium alloy canopy were made, each of which was located in the metal Standard on the type. Under a stereomicroscope, the fit between the base crown edge and the metal-made shoulder was observed, imaged with a CCD, and the edge slit width was measured using a professional image measurement software. Finally, the average of 10 samples in each group was calculated and the data was processed by SPSS11.5 software package. Results: The average marginal gap width of high gold alloy, cobalt-chromium alloy and nickel-chromium alloy were (72.9 ± 29.3), (85.9 ± 33.0) and (94.1 ± 44.9) μm, respectively. The edge gap width of the alloy is significantly smaller than that of the cobalt-chromium alloy (P <0.01) and the nickel-chromium alloy (P <0.001), while the crevice width of the base of the cobalt-chromium alloy is significantly smaller than that of the nickel-chromium alloy (P <0.05). CONCLUSION: The marginal adaptability of the three porcelain fused metal base crowns is within the clinically acceptable range, while the marginal adaptability of the high gold alloy base crowns is significantly higher than the other two alloys.