女，45岁。<img src="/Image1/af/aff5912934924d619458299c1edfbaf4.jpg" />缺失，<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" />临床冠过短、低<img src="/Image1/5c/5c7e49729851f976adf33a3de7213c81.png" />，余留牙正常。<img src="/Image1/7f/7f23c1bca1ca1ba89783e54701bb3686.jpg" />间隙卡环、<img src="/Image1/3a/3a0e93ea4ee3550fc76f817679c9b753.jpg" />单臂卡环胶连式可摘局部义齿修复2周，义齿压痛，缺隙区黏膜弥漫性红肿，余留牙正常。如果<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" />为残根，根面位于龈上1～2mm，不松动，叩痛（-）。重新义齿修复前首先应进行的是（）。<br>A:拔除<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" /><br>B:<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" />桩核冠修复<br>C:<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" />拍X线片<br>D:<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" />根管治疗<br>E:<img src="/Image1/ab/abeca2f70f2cb24c17e105e840299985.jpg" />牙冠延长术