PFM crowns

• 金属烤瓷冠桥

PFM crowns的用法和样例：

例句

1. Objective The PFM prosthesis by using gingival retraction has been observed something about its effect and the condition of gingival tissues' injury.
   摘要目的在烤瓷熔附金属冠桥修复的不同时期应用排龈技术，观察烤瓷修复的效果及对牙龈组织的损伤情况。