戴全口义齿数天,主诉上前牙与下前牙有距离较大,后牙对不好前来就诊。查:上下前牙水平开后牙呈尖对尖关系,垂直距离过高。造成这种临床表现的原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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