两种铸造金属全冠适合性研究

目的：研究镍铬合金铸造全冠与金钯合金铸造全冠适合性的差异。方法：选取日进标准下颌第一磨牙铸造全冠预备体30颗,分为两组,每组15颗。第一组制作镍铬合金铸造全冠,第二组制作金钯合金铸造全冠,在扫描仪下测量边缘间隙及内间隙,数据进行统计学处理。结果：镍铬合金铸造全冠边缘间隙的平均值为（95.760 0±2.444 76）μm,轴面内间隙的平均值为（68.240 0±3.108 24）μm,面内间隙的平均值为（188.600 0±4.533 21）μm;金钯合金铸造全冠边缘间隙的平均值为（79.666 7±2.644 85）μm,轴面内间隙的平均值为（52.226 7±2.930 01）μm,面内间隙的平均值为（148.873 3±2.998 92）μm,相同间隙组间差异有统计学意义（P〈0.01）。结论：金钯合金铸造全冠的适合性优于镍铬合金铸造全冠。

Experimental research on the adaptation of two different cast full crowns

Objective： To study the difference on the adaptation between Ni-Cr alloys cast full crowns and Au-Pd alloys cast full crowns.Methods： To take 30 exacted premolars which were done tooth preparation according to full crown by Nissin,and to evenly divide them into 2 groups,Ni-Cr alloys crown group and Au-Pd alloys crown group.Then to measure the margin gaps by scanner and to analyze results by paired t-test.Results： The mean value of the Ni-Cr alloys crown marginal gap was（95.760 0±2.444 76） μm,the internal gap was（68.240 0±3.108 24） μm,the occlusal gap was（188.600 0±4.533 21） μm;while the mean value of Au-Pd alloys crown marginal gap was（79.666 7±2.644 85） μm,the internal gap was（52.226 7±2.930 01） μm,the occlusal gap was（148.873 3±2.998 92） μm.The difference of two groups was significant（P0.01）.Conclusion： The fitness of Au-Pd alloys cast full crowns has a more obvious advantage than Ni-Cr alloys cast full crowns.