患者，半月前因前牙折断，已在外院做“根管治疗”，现无不适主诉。检查:左上侧切牙冠折，断面与龈齐，根管口Z0E暂封，叩（-)，松动（-)，牙龈无明显充血及水肿，前牙咬合较紧，余牙无异常。X线片显示该牙已做完善的根管治疗，根尖无明显阴影。桩核预备时，唇侧肩台应为烤瓷冠留出的空间是

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