目的：观察金属成品冠修复乳磨牙大面积缺损的疗效。
PURPOSE: To observe the clinical effect of treatment of primary molar teeth with extensive defect using prefabricated metal crowns (PMCs).
东莞市品冠检测科技有限公司集开发，生产，销售为一体，有多年测漏设备的研发生产经验。
PingGuan leak testing Company merges the exploitation, production and sale into one integer with many years experience in research and manufacture of the leak-testing equipments.
东莞市品冠检测科技有限公司集开发，生产，销售为一体，有多年测漏设备的研发生产经验。
PingGuan leak testing Company merges the exploitation, production and sale into one integer with many years experience in research and manufacture of the leak-testing equipments.
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