题目内容

上合架的注意事项中，错误的是

A. 上合架前要检查合架的各个组成部分是否完整，各固定螺丝能否完全拧紧
B. 在用石膏将下颌模型固定在合架上时，在石膏初凝前，应当将合架正置
C. 下颌模型因石膏太软而下沉，与基托组织面失去接触，会导致上、下颌颌位关系的改变
D. 石膏初凝后，最好能用绳将合架上、下颌体的前端捆扎固定
E. 在确定髁导斜度和切导斜度之前，要洗净合架上多余的石膏

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