病人：我的牙齿断了。牙神经已死，牙已变色，怎么办?。
Patient: I fell and broke my tooth. The nerve died, so the color has changed. What should I do?
结果：修复前12颗死髓变色基牙游离龈轻度变色。
Results:Before restoration, only 12 non vital darkened abutments showed slight gingival discoloration.
本法有利于临床开展对死髓牙或活力很低的牙进行粘接修复。
This pre-treatment will benefit the adhesive restoration for dead tooth or low activity toothclinically.
斗牛士赢得。公牛死。结束？不是在葡萄牙。
四环素变色牙、釉质发育不全、死髓变色牙、牙体间隙及牙体缺损缺失等因素均能够影响牙体或牙列的功用和美观，后者在前牙区尤其突出。
Objective To compare the esthetic effect and the change of periodontal tissue in restoring anterior teeth with porcelain fused to metal crown and all ceramic crown.
四环素变色牙、釉质发育不全、死髓变色牙、牙体间隙及牙体缺损缺失等因素均能够影响牙体或牙列的功用和美观，后者在前牙区尤其突出。
Objective To compare the esthetic effect and the change of periodontal tissue in restoring anterior teeth with porcelain fused to metal crown and all ceramic crown.
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