10年前刘女士把4颗门牙做了烤瓷牙,但是最近她发现有一颗门牙的牙龈边上出现了一道黑线,牙龈也萎缩了,有时候喝点冷冻的饮料就感觉牙酸。牙科医生仔细检查了刘女士的烤瓷牙状况,表示这种情况最好是拆了重做。因为烤瓷牙的牙冠与牙根之间不密合,已经有一条缝了,有了这条缝,食物的残渣、细菌等都容易从这条缝进入牙套里去,从而让 Ten years ago, Ms. Liu made the porcelain teeth of four incisors, but recently she found a black line along the edge of the gingiva of a incisor, the gums also shrunk, and occasionally a bit of frozen drink to feel aching. Dentist carefully examined the situation of Ms. Liu porcelain teeth, said the best situation is demolished redone. Because the porcelain teeth between the tooth crown and root is not close, there is already a seam, with this seam, food debris, bacteria, etc. are easy to enter the braces from this seam, so that