男，47岁。右上后牙固定义齿修复半年后松动。查：<img src="/Image1/6b/6b4c9066f3c59040f1c1d58ac268f172.jpg" />缺失，余牙正常，<img src="/Image1/cd/cde6d0d3f58e4749c7cb1bceb38c713e.jpg" />全冠固定桥，<img src="/Image1/b6/b66b193df300d2306b67b8ff5f5bd618.jpg" />固位体松动。拆除固定桥后发现，<img src="/Image1/b6/b66b193df300d2306b67b8ff5f5bd618.jpg" />预备体聚合度过大，轴面浅龋。重新修复时应（）。<br>A:增加<img src="/Image1/11/11fb349f87ddaafedd3022a5b1c5e7e6.jpg" />做基牙<br>B:增加<img src="/Image1/a1/a1142bafd118a80c16fd0724835139cd.jpg" />做基牙<br>C:<img src="/Image1/b6/b66b193df300d2306b67b8ff5f5bd618.jpg" />牙髓失活、根管治疗后改桩核冠固位体<br>D:<img src="/Image1/b6/b66b193df300d2306b67b8ff5f5bd618.jpg" />重新预备，增加固位体密合性<br>E:改<img src="/Image1/7a/7a4e51dacf381dd3b5f72dbb8dd01788.jpg" />单端固定桥