旧桩冠上的烤瓷全冠修复米延玲张蓉塑料桩冠等修复体因材料本身易老化、耐磨性差、结合强度有限，一般在数年后会不同程度的出现变色、磨损、牙面脱落等现象。以往处理，多需拆除旧桩冠，重新制作，难以拆除的则采用自凝树脂或光固化材料进行口内修补，其远期效果均不甚理... The crown of the old crown of the crown to repair the repair Yin Yan Ling Zhang Rong plastic crown and other prosthetics due to the material itself is easy to aging, poor wear resistance, combined with limited strength, usually after a few years there will be varying degrees of discoloration, wear, teeth Surface off and so on. In the past, the removal of the old pile crown, re-production, it is difficult to remove the self-curing resin or light curing materials for oral repair, its long-term effects are not very ...