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).
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).
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