观察金瓷冠加载后表面微观结构的变化；
目的：探讨不同支架设计对金瓷冠抗压强度的影响。
Objective: To investigate the effect of different frame designs on compressive strength of the ceramometal restoration.
目的本研究旨在探讨使用牙科放大镜临床牙体预备后对金瓷冠唇侧牙周状况的影响。
Objective to investigate the effect of labial periodontal of PFM crown after clinical tooth preparation used by dental magnifier.
适当增加金瓷冠基底冠金属或瓷层厚度对金瓷冠强度无明显影响，但是瓷层过厚或基底冠金属过厚都使金瓷冠强度降低。
Increasing the thickness of metal and porcelain in proper rang has no significant effect on the strength of metal-ceramic crown.
目的对比不同金属基底和遮色瓷厚度对金瓷修复体色彩的影响，力求找出能有效遮住底层冠金属色的最佳遮色瓷厚度。
Objective To compare the color differences of different metal bases and different opaque thickness, and evaluate the best thickness of opaque on different metal bases.
目的对比不同金属基底和遮色瓷厚度对金瓷修复体色彩的影响，力求找出能有效遮住底层冠金属色的最佳遮色瓷厚度。
Objective To compare the color differences of different metal bases and different opaque thickness, and evaluate the best thickness of opaque on different metal bases.
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